LayoutConstraints - 无法同时满足约束
LayoutConstraints - Unable to simultaneously satisfy constraints
我有一个应用程序，当我点击我的个人资料页面时，我的控制台中不断出现这些错误
我试过了
这是我个人资料页面上的全部限制条件
我一直在
john
jane
andrew
2018-07-31 11:58:46.821640-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x604000281130 UIImageView:0x7ff91cf1d030.width == 70 (active)>",
"<NSLayoutConstraint:0x6040002812c0 UIImageView:0x7ff91cf1d030.width == UIImageView:0x7ff91cf1d030.height (active)>",
"<NSLayoutConstraint:0x604000280d20 UITableViewCellContentView:0x7ff91cf1c7f0.bottomMargin == UIImageView:0x7ff91cf1d030.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x6040002815e0 UIImageView:0x7ff91cf1d030.top == UITableViewCellContentView:0x7ff91cf1c7f0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290040 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cf1c7f0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6040002812c0 UIImageView:0x7ff91cf1d030.width == UIImageView:0x7ff91cf1d030.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.822304-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x604000280d20 UITableViewCellContentView:0x7ff91cf1c7f0.bottomMargin == UIImageView:0x7ff91cf1d030.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x6040002815e0 UIImageView:0x7ff91cf1d030.top == UITableViewCellContentView:0x7ff91cf1c7f0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x604000281310 UIImageView:0x7ff91cf1d030.height == 70 (active)>",
"<NSLayoutConstraint:0x60c000290040 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cf1c7f0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x604000281310 UIImageView:0x7ff91cf1d030.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.822846-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c00028fa00 UIImageView:0x7ff91cc140c0.width == 70 (active)>",
"<NSLayoutConstraint:0x60c00028ff00 UIImageView:0x7ff91cc140c0.width == UIImageView:0x7ff91cc140c0.height (active)>",
"<NSLayoutConstraint:0x60c00028a8c0 UITableViewCellContentView:0x7ff91cc13cb0.bottomMargin == UIImageView:0x7ff91cc140c0.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000289b50 UIImageView:0x7ff91cc140c0.top == UITableViewCellContentView:0x7ff91cc13cb0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290900 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc13cb0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c00028ff00 UIImageView:0x7ff91cc140c0.width == UIImageView:0x7ff91cc140c0.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.823293-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c00028a8c0 UITableViewCellContentView:0x7ff91cc13cb0.bottomMargin == UIImageView:0x7ff91cc140c0.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000289b50 UIImageView:0x7ff91cc140c0.top == UITableViewCellContentView:0x7ff91cc13cb0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c00028fb90 UIImageView:0x7ff91cc140c0.height == 70 (active)>",
"<NSLayoutConstraint:0x60c000290900 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc13cb0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c00028fb90 UIImageView:0x7ff91cc140c0.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.823961-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c000290ae0 UIImageView:0x7ff91cc16a40.width == 70 (active)>",
"<NSLayoutConstraint:0x60c000290b30 UIImageView:0x7ff91cc16a40.width == UIImageView:0x7ff91cc16a40.height (active)>",
"<NSLayoutConstraint:0x60c000290cc0 UITableViewCellContentView:0x7ff91cc16840.bottomMargin == UIImageView:0x7ff91cc16a40.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000290d60 UIImageView:0x7ff91cc16a40.top == UITableViewCellContentView:0x7ff91cc16840.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x6040002822b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc16840.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c000290b30 UIImageView:0x7ff91cc16a40.width == UIImageView:0x7ff91cc16a40.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.824333-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c000290cc0 UITableViewCellContentView:0x7ff91cc16840.bottomMargin == UIImageView:0x7ff91cc16a40.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000290d60 UIImageView:0x7ff91cc16a40.top == UITableViewCellContentView:0x7ff91cc16840.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290b80 UIImageView:0x7ff91cc16a40.height == 70 (active)>",
"<NSLayoutConstraint:0x6040002822b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc16840.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c000290b80 UIImageView:0x7ff91cc16a40.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
这就是我的
//
// ProfileViewController
// tableInTabbed
//
// Copyright © 2018 LR Web Design. All rights reserved.
//
import UIKit
class ProfileViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let profiles = ["john", "jane", "andrew"]
let devicesInProfile = ["3", "5", "10"]
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (profiles.count)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ViewControllerTableViewCell
cell.profileImg.image = UIImage(named: profiles[indexPath.row] + ".jpg")
cell.profileName.text = profiles[indexPath.row]
print(profiles[indexPath.row])
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
我只想摆脱错误消息。
更新
@Sandeep，在尝试了你的答案后，我得到了这个最后的约束
这是结果
你能再多提点建议吗？
1-确保从上到下只有一条路径的元素挂钩到contentView，如果看到红线，断开底部约束并更改中间项约束，然后重新挂钩
2- 将最低约束优先级设置为 999
3- 设置通向 imageView 且仅底部 - 大多数元素应挂接到 contentView 的底部
//
这里的蓝线应该只是img width&height的约束
//
在 viewDidLoad 中设置
tableView.estimatedRowHeight = 200;
tableView.rowHeight = UITableViewAutomaticDimension;
第 1 步：
将一个视图拖到您的单元格，然后将水平和垂直居中约束应用于您的视图（这将显示很少的约束中断，但会稍等片刻）
第 2 步：
拖动 imageView 以查看并应用高度约束/纵横比/前导/高度和底部约束，如图所示
第 3 步：
将 UILabel 拖到 View 最好是 ImageView 的右侧，并对标签应用尾部约束和前导约束。前导约束将指向单元格的内容视图，同时前导约束指向 UIImageView。
标签的尾随约束
现在向 UIImageView 添加 Leading 约束（控制从标签到 imageView 的拖动和 select 水平间距）
最后再次控制从label拖到imageView并select垂直居中
应该是这样:)
如果一切正常，最终的约束应该是这样的
希望这对您有所帮助
你在你的代码中做了什么似乎没问题，但它与你在控制台中看到的无关。
首先，您应该知道红色约束意味着有问题，更具体地说，它意味着界面构建器无法识别要实现的目标，因为至少缺少一个约束（这就是为什么您会看到这些抱怨在控制台上）。
因此，我强烈建议避免遵循"Adding Missing Constraints"或[=的方法30=]，它不是处理约束的优雅选项；大多数时候，即使他们没有添加红色（缺失）约束，也不会导致预期的结果，这似乎是合乎逻辑的，因为读取你的想法并翻译它并没有那么神奇，它们可能不仅仅是确定如何设置约束的方式的一个方面！相反，你自己做，这是实现它应该实现的目标的好方法 look/behave。请记住，这不仅仅是一种静态方法，在了解自动布局的工作原理后，您会发现实现它的方法不止一种。
通常，预期结果是看到蓝线（约束）而不是红色或橙色。
现在，因为描述如何设置约束（自动布局）可能很宽泛，我建议查看：Understanding Auto Layout 来自 Apple，这是一个很好的起点。
我有一个应用程序，当我点击我的个人资料页面时，我的控制台中不断出现这些错误
我试过了
这是我个人资料页面上的全部限制条件
我一直在
john
jane
andrew
2018-07-31 11:58:46.821640-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x604000281130 UIImageView:0x7ff91cf1d030.width == 70 (active)>",
"<NSLayoutConstraint:0x6040002812c0 UIImageView:0x7ff91cf1d030.width == UIImageView:0x7ff91cf1d030.height (active)>",
"<NSLayoutConstraint:0x604000280d20 UITableViewCellContentView:0x7ff91cf1c7f0.bottomMargin == UIImageView:0x7ff91cf1d030.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x6040002815e0 UIImageView:0x7ff91cf1d030.top == UITableViewCellContentView:0x7ff91cf1c7f0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290040 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cf1c7f0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6040002812c0 UIImageView:0x7ff91cf1d030.width == UIImageView:0x7ff91cf1d030.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.822304-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x604000280d20 UITableViewCellContentView:0x7ff91cf1c7f0.bottomMargin == UIImageView:0x7ff91cf1d030.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x6040002815e0 UIImageView:0x7ff91cf1d030.top == UITableViewCellContentView:0x7ff91cf1c7f0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x604000281310 UIImageView:0x7ff91cf1d030.height == 70 (active)>",
"<NSLayoutConstraint:0x60c000290040 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cf1c7f0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x604000281310 UIImageView:0x7ff91cf1d030.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.822846-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c00028fa00 UIImageView:0x7ff91cc140c0.width == 70 (active)>",
"<NSLayoutConstraint:0x60c00028ff00 UIImageView:0x7ff91cc140c0.width == UIImageView:0x7ff91cc140c0.height (active)>",
"<NSLayoutConstraint:0x60c00028a8c0 UITableViewCellContentView:0x7ff91cc13cb0.bottomMargin == UIImageView:0x7ff91cc140c0.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000289b50 UIImageView:0x7ff91cc140c0.top == UITableViewCellContentView:0x7ff91cc13cb0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290900 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc13cb0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c00028ff00 UIImageView:0x7ff91cc140c0.width == UIImageView:0x7ff91cc140c0.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.823293-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c00028a8c0 UITableViewCellContentView:0x7ff91cc13cb0.bottomMargin == UIImageView:0x7ff91cc140c0.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000289b50 UIImageView:0x7ff91cc140c0.top == UITableViewCellContentView:0x7ff91cc13cb0.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c00028fb90 UIImageView:0x7ff91cc140c0.height == 70 (active)>",
"<NSLayoutConstraint:0x60c000290900 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc13cb0.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c00028fb90 UIImageView:0x7ff91cc140c0.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.823961-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c000290ae0 UIImageView:0x7ff91cc16a40.width == 70 (active)>",
"<NSLayoutConstraint:0x60c000290b30 UIImageView:0x7ff91cc16a40.width == UIImageView:0x7ff91cc16a40.height (active)>",
"<NSLayoutConstraint:0x60c000290cc0 UITableViewCellContentView:0x7ff91cc16840.bottomMargin == UIImageView:0x7ff91cc16a40.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000290d60 UIImageView:0x7ff91cc16a40.top == UITableViewCellContentView:0x7ff91cc16840.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x6040002822b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc16840.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c000290b30 UIImageView:0x7ff91cc16a40.width == UIImageView:0x7ff91cc16a40.height (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
2018-07-31 11:58:46.824333-0400 tableInTabbed[4355:5682078] [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.
(
"<NSLayoutConstraint:0x60c000290cc0 UITableViewCellContentView:0x7ff91cc16840.bottomMargin == UIImageView:0x7ff91cc16a40.bottom + 52.67 (active)>",
"<NSLayoutConstraint:0x60c000290d60 UIImageView:0x7ff91cc16a40.top == UITableViewCellContentView:0x7ff91cc16840.topMargin + 29.33 (active)>",
"<NSLayoutConstraint:0x60c000290b80 UIImageView:0x7ff91cc16a40.height == 70 (active)>",
"<NSLayoutConstraint:0x6040002822b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7ff91cc16840.height == 168 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60c000290b80 UIImageView:0x7ff91cc16a40.height == 70 (active)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
这就是我的
//
// ProfileViewController
// tableInTabbed
//
// Copyright © 2018 LR Web Design. All rights reserved.
//
import UIKit
class ProfileViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let profiles = ["john", "jane", "andrew"]
let devicesInProfile = ["3", "5", "10"]
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (profiles.count)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ViewControllerTableViewCell
cell.profileImg.image = UIImage(named: profiles[indexPath.row] + ".jpg")
cell.profileName.text = profiles[indexPath.row]
print(profiles[indexPath.row])
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
我只想摆脱错误消息。
更新
@Sandeep，在尝试了你的答案后，我得到了这个最后的约束
这是结果
你能再多提点建议吗？
1-确保从上到下只有一条路径的元素挂钩到contentView，如果看到红线，断开底部约束并更改中间项约束，然后重新挂钩
2- 将最低约束优先级设置为 999
3- 设置通向 imageView 且仅底部 - 大多数元素应挂接到 contentView 的底部
//
这里的蓝线应该只是img width&height的约束
//
在 viewDidLoad 中设置
tableView.estimatedRowHeight = 200;
tableView.rowHeight = UITableViewAutomaticDimension;
第 1 步：
将一个视图拖到您的单元格，然后将水平和垂直居中约束应用于您的视图（这将显示很少的约束中断，但会稍等片刻）
第 2 步：
拖动 imageView 以查看并应用高度约束/纵横比/前导/高度和底部约束，如图所示
第 3 步：
将 UILabel 拖到 View 最好是 ImageView 的右侧，并对标签应用尾部约束和前导约束。前导约束将指向单元格的内容视图，同时前导约束指向 UIImageView。
标签的尾随约束
现在向 UIImageView 添加 Leading 约束（控制从标签到 imageView 的拖动和 select 水平间距）
最后再次控制从label拖到imageView并select垂直居中
应该是这样:)
如果一切正常，最终的约束应该是这样的
希望这对您有所帮助
你在你的代码中做了什么似乎没问题，但它与你在控制台中看到的无关。
首先，您应该知道红色约束意味着有问题，更具体地说，它意味着界面构建器无法识别要实现的目标，因为至少缺少一个约束（这就是为什么您会看到这些抱怨在控制台上）。
因此，我强烈建议避免遵循"Adding Missing Constraints"或[=的方法30=]，它不是处理约束的优雅选项；大多数时候，即使他们没有添加红色（缺失）约束，也不会导致预期的结果，这似乎是合乎逻辑的，因为读取你的想法并翻译它并没有那么神奇，它们可能不仅仅是确定如何设置约束的方式的一个方面！相反，你自己做，这是实现它应该实现的目标的好方法 look/behave。请记住，这不仅仅是一种静态方法，在了解自动布局的工作原理后，您会发现实现它的方法不止一种。
通常，预期结果是看到蓝线（约束）而不是红色或橙色。
现在，因为描述如何设置约束（自动布局）可能很宽泛，我建议查看：Understanding Auto Layout 来自 Apple，这是一个很好的起点。