用于键盘输入AccessoryView的简单UIToolar的布局约束错误
Layout Constraint Errors with simple UIToolar for keyboard inputAccessoryView
我遇到了很多布局约束错误，所以我创建了一个新项目并使用 UIToolbar 和 UITextField 来尝试解决问题。即使是一个干净的项目，即使我没有覆盖 .inputAccessoryView 的任何约束，我仍然会遇到奇怪的错误。
代码如下（无故事板内容）：
import UIKit
class ViewController: UIViewController {
var aTextField = UITextField()
override func viewDidLoad() {
super.viewDidLoad()
let aKeyboardToolBar = UIToolbar()
// add buttons to the toolbar
let prevButton = UIBarButtonItem(title: "PREV", style: .done, target: self, action: #selector(prevButtonTapped))
let nextButton = UIBarButtonItem(title: "NEXT", style: .done, target: self, action: #selector(nextButtonTapped))
let doneButton = UIBarButtonItem(title: "DONE", style: .done, target: self, action: #selector(doneButtonTapped))
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
aKeyboardToolBar.setItems([prevButton, nextButton, flexibleSpace, doneButton], animated: true)
aKeyboardToolBar.sizeToFit()
// Add first textfield
view.addSubview(aTextField)
aTextField.backgroundColor = .orange
aTextField.placeholder = "Blank TextField"
aTextField.inputAccessoryView = aKeyboardToolBar
// Layout first text field
aTextField.translatesAutoresizingMaskIntoConstraints = false
aTextField.topAnchor.constraint(equalTo: view.topAnchor, constant: 150).isActive = true
aTextField.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 20).isActive = true
aTextField.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20).isActive = true
}
@objc func prevButtonTapped() {
print("prevButtonTapped")
}
@objc func nextButtonTapped() {
print("nextButtonTapped")
}
@objc func doneButtonTapped() {
view.endEditing(true)
}
}
错误（KeyboardShifter 是项目名称）：
2020-01-12 11:41:16.300180+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2ab70 'TB_Leading_Leading' H:|-(8)-[_UIModernBarButton:0x1011645b0'NEXT'] (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2abc0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011645b0'NEXT']-(8)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2abc0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011645b0'NEXT']-(8)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.301336+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2a490 'TB_Leading_Leading' H:|-(0)-[_UIModernBarButton:0x10115e6d0'PREV'] (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2a4e0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x10115e6d0'PREV']-(8)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2a4e0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x10115e6d0'PREV']-(8)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.302024+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b200 'TB_Leading_Leading' H:|-(8)-[_UIModernBarButton:0x1011652c0'DONE'] (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b250 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011652c0'DONE']-(0)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2b250 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011652c0'DONE']-(0)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.302742+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f250e0 UIButtonLabel:0x101163420'PREV'.centerY == _UIModernBarButton:0x10115e6d0'PREV'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2a670 'TB_Baseline_Baseline' _UIModernBarButton:0x10115e6d0'PREV'.lastBaseline == UILayoutGuide:0x28257c620'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2a6c0 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x10115e6d0'PREV'] (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2a800 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x10115d760.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2a5d0 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c620'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f250e0 UIButtonLabel:0x101163420'PREV'.centerY == _UIModernBarButton:0x10115e6d0'PREV'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.303504+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f25810 UIButtonLabel:0x101164880'NEXT'.centerY == _UIModernBarButton:0x1011645b0'NEXT'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2ad50 'TB_Baseline_Baseline' _UIModernBarButton:0x1011645b0'NEXT'.lastBaseline == UILayoutGuide:0x28257c700'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2ada0 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x1011645b0'NEXT'] (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2aee0 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x1011641d0.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2acb0 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c700'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f25810 UIButtonLabel:0x101164880'NEXT'.centerY == _UIModernBarButton:0x1011645b0'NEXT'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.304192+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f25f40 UIButtonLabel:0x101165590'DONE'.centerY == _UIModernBarButton:0x1011652c0'DONE'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2b3e0 'TB_Baseline_Baseline' _UIModernBarButton:0x1011652c0'DONE'.lastBaseline == UILayoutGuide:0x28257c7e0'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2b430 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x1011652c0'DONE'] (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b570 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x1011650e0.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2b340 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c7e0'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f25f40 UIButtonLabel:0x101165590'DONE'.centerY == _UIModernBarButton:0x1011652c0'DONE'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
有什么想法吗？
改变
let aKeyboardToolBar = UIToolbar()
至
let aKeyboardToolBar = UIToolbar(frame:CGRect(x:0, y:0, width:100, height:100))
这样它就有 一些 大小可以在你给它内容时使用。
我得到了
Unable to simultaneously satisfy constraints
我的键盘 inputAccessoryView 中的 UIToolbar 出错，但我的 UIToolbar 的尺寸已经在实例化时定义：
@objc var accessoryDoneButton: UIBarButtonItem!
@objc var emptyButton: UIBarButtonItem!
@objc let accessoryToolBar = UIToolbar(frame: CGRect(x:0, y: 0,width:UIScreen.main.bounds.width, height:44))
我通过更改 UIToolBar 中的项目解决了我的问题：
// Position dismiss button in the 3rd. space from the left side of toolbar.
// self.accessoryToolBar.items = [self.emptyButton, self.emptyButton, self.emptyButton, self.accessoryDoneButton]
self.accessoryToolBar.items = [self.accessoryDoneButton]
self.symptomDescription.inputAccessoryView = self.accessoryToolBar
因为我不需要自动更正，所以我的解决方案只是设置
textField.autocorrectionType = .no
在我现在正在编写的应用程序中，用户可以在填充各种文本字段之间来回切换，这可能会破坏 UIToolbar 约束。
希望对大家有所帮助！
我遇到了很多布局约束错误，所以我创建了一个新项目并使用 UIToolbar 和 UITextField 来尝试解决问题。即使是一个干净的项目，即使我没有覆盖 .inputAccessoryView 的任何约束，我仍然会遇到奇怪的错误。
代码如下（无故事板内容）：
import UIKit
class ViewController: UIViewController {
var aTextField = UITextField()
override func viewDidLoad() {
super.viewDidLoad()
let aKeyboardToolBar = UIToolbar()
// add buttons to the toolbar
let prevButton = UIBarButtonItem(title: "PREV", style: .done, target: self, action: #selector(prevButtonTapped))
let nextButton = UIBarButtonItem(title: "NEXT", style: .done, target: self, action: #selector(nextButtonTapped))
let doneButton = UIBarButtonItem(title: "DONE", style: .done, target: self, action: #selector(doneButtonTapped))
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
aKeyboardToolBar.setItems([prevButton, nextButton, flexibleSpace, doneButton], animated: true)
aKeyboardToolBar.sizeToFit()
// Add first textfield
view.addSubview(aTextField)
aTextField.backgroundColor = .orange
aTextField.placeholder = "Blank TextField"
aTextField.inputAccessoryView = aKeyboardToolBar
// Layout first text field
aTextField.translatesAutoresizingMaskIntoConstraints = false
aTextField.topAnchor.constraint(equalTo: view.topAnchor, constant: 150).isActive = true
aTextField.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 20).isActive = true
aTextField.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20).isActive = true
}
@objc func prevButtonTapped() {
print("prevButtonTapped")
}
@objc func nextButtonTapped() {
print("nextButtonTapped")
}
@objc func doneButtonTapped() {
view.endEditing(true)
}
}
错误（KeyboardShifter 是项目名称）：
2020-01-12 11:41:16.300180+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2ab70 'TB_Leading_Leading' H:|-(8)-[_UIModernBarButton:0x1011645b0'NEXT'] (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2abc0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011645b0'NEXT']-(8)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2abc0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011645b0'NEXT']-(8)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.301336+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2a490 'TB_Leading_Leading' H:|-(0)-[_UIModernBarButton:0x10115e6d0'PREV'] (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2a4e0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x10115e6d0'PREV']-(8)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2a4e0 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x10115e6d0'PREV']-(8)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.302024+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f240a0 h=--& v=--& _UIToolbarContentView:0x10125fed0.width == 0 (active)>",
"<NSLayoutConstraint:0x283f45d60 H:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45db0 _UIButtonBarStackView:0x10120fba0.trailing == _UIToolbarContentView:0x10125fed0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b200 'TB_Leading_Leading' H:|-(8)-[_UIModernBarButton:0x1011652c0'DONE'] (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b250 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011652c0'DONE']-(0)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b5c0 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x10115d760.leading (active)>",
"<NSLayoutConstraint:0x283f2b610 'UISV-canvas-connection' UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x1011650e0.trailing (active)>",
"<NSLayoutConstraint:0x283f2b840 'UISV-spacing' H:[_UIButtonBarButton:0x10115d760]-(0)-[UIView:0x101164060] (active)>",
"<NSLayoutConstraint:0x283f2b890 'UISV-spacing' H:[UIView:0x101164060]-(0)-[_UIButtonBarButton:0x1011641d0] (active)>",
"<NSLayoutConstraint:0x283f2b8e0 'UISV-spacing' H:[_UIButtonBarButton:0x1011641d0]-(0)-[UIView:0x101164f70] (active)>",
"<NSLayoutConstraint:0x283f2b930 'UISV-spacing' H:[UIView:0x101164f70]-(0)-[_UIButtonBarButton:0x1011650e0] (active)>",
"<NSLayoutConstraint:0x283f45bd0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f45c70 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f2b250 'TB_Trailing_Trailing' H:[_UIModernBarButton:0x1011652c0'DONE']-(0)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.302742+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f250e0 UIButtonLabel:0x101163420'PREV'.centerY == _UIModernBarButton:0x10115e6d0'PREV'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2a670 'TB_Baseline_Baseline' _UIModernBarButton:0x10115e6d0'PREV'.lastBaseline == UILayoutGuide:0x28257c620'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2a6c0 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x10115e6d0'PREV'] (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f2a800 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x10115d760.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2a5d0 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c620'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x10115d760 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f250e0 UIButtonLabel:0x101163420'PREV'.centerY == _UIModernBarButton:0x10115e6d0'PREV'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.303504+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f25810 UIButtonLabel:0x101164880'NEXT'.centerY == _UIModernBarButton:0x1011645b0'NEXT'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2ad50 'TB_Baseline_Baseline' _UIModernBarButton:0x1011645b0'NEXT'.lastBaseline == UILayoutGuide:0x28257c700'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2ada0 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x1011645b0'NEXT'] (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f2aee0 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x1011641d0.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2acb0 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c700'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x1011641d0 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f25810 UIButtonLabel:0x101164880'NEXT'.centerY == _UIModernBarButton:0x1011645b0'NEXT'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-01-12 11:41:16.304192+1100 KeyboardShifter[1304:1170583] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)
(
"<NSAutoresizingMaskLayoutConstraint:0x283f24140 h=--& v=--& _UIToolbarContentView:0x10125fed0.height == 0 (active)>",
"<NSLayoutConstraint:0x283f45e00 V:|-(0)-[_UIButtonBarStackView:0x10120fba0] (active, names: '|':_UIToolbarContentView:0x10125fed0 )>",
"<NSLayoutConstraint:0x283f45e50 _UIButtonBarStackView:0x10120fba0.bottom == _UIToolbarContentView:0x10125fed0.bottom (active)>",
"<NSLayoutConstraint:0x283f25f40 UIButtonLabel:0x101165590'DONE'.centerY == _UIModernBarButton:0x1011652c0'DONE'.centerY + 1.5 (active)>",
"<NSLayoutConstraint:0x283f2b3e0 'TB_Baseline_Baseline' _UIModernBarButton:0x1011652c0'DONE'.lastBaseline == UILayoutGuide:0x28257c7e0'UIViewLayoutMarginsGuide'.bottom (active)>",
"<NSLayoutConstraint:0x283f2b430 'TB_Top_Top' V:|-(>=0)-[_UIModernBarButton:0x1011652c0'DONE'] (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f2b570 'UIButtonBar.maximumAlignmentSize' _UIButtonBarButton:0x1011650e0.height == UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'.height (active)>",
"<NSLayoutConstraint:0x283f45c20 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide']-(0)-| (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>",
"<NSLayoutConstraint:0x283f2b340 'UIView-bottomMargin-guide-constraint' V:[UILayoutGuide:0x28257c7e0'UIViewLayoutMarginsGuide']-(11)-| (active, names: '|':_UIButtonBarButton:0x1011650e0 )>",
"<NSLayoutConstraint:0x283f45b80 'UIView-topMargin-guide-constraint' V:|-(0)-[UILayoutGuide:0x282568460'UIViewLayoutMarginsGuide'] (active, names: '|':_UIButtonBarStackView:0x10120fba0 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x283f25f40 UIButtonLabel:0x101165590'DONE'.centerY == _UIModernBarButton:0x1011652c0'DONE'.centerY + 1.5 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
有什么想法吗？
改变
let aKeyboardToolBar = UIToolbar()
至
let aKeyboardToolBar = UIToolbar(frame:CGRect(x:0, y:0, width:100, height:100))
这样它就有 一些 大小可以在你给它内容时使用。
我得到了
Unable to simultaneously satisfy constraints
我的键盘 inputAccessoryView 中的 UIToolbar 出错，但我的 UIToolbar 的尺寸已经在实例化时定义：
@objc var accessoryDoneButton: UIBarButtonItem!
@objc var emptyButton: UIBarButtonItem!
@objc let accessoryToolBar = UIToolbar(frame: CGRect(x:0, y: 0,width:UIScreen.main.bounds.width, height:44))
我通过更改 UIToolBar 中的项目解决了我的问题：
// Position dismiss button in the 3rd. space from the left side of toolbar.
// self.accessoryToolBar.items = [self.emptyButton, self.emptyButton, self.emptyButton, self.accessoryDoneButton]
self.accessoryToolBar.items = [self.accessoryDoneButton]
self.symptomDescription.inputAccessoryView = self.accessoryToolBar
因为我不需要自动更正，所以我的解决方案只是设置
textField.autocorrectionType = .no
在我现在正在编写的应用程序中，用户可以在填充各种文本字段之间来回切换，这可能会破坏 UIToolbar 约束。
希望对大家有所帮助！