VC 使用 UISlider 更改 VC2 上的文本字段
VC with UISlider to change textfield on VC2
我有一个视图控制器,它有一个 tableView 嵌入到 ContainerView 中,并且在 ContainerView 正下方我有一个 UISlider。我在 UISlider 的视图控制器上有代码,在另一个控制 table 视图的视图控制器上有代码。
UISlider 的属性是根据选定的文本字段设置的 - 这部分代码有效。我正在努力创建一个 function/feature ,它会在移动 UISlider 时更改 textField 值。我认为 UISlider Action 需要在控制 UISlider 的代码上,但我无法确定如何在两个 viewController 之间转换 UISlider.setvalue 的值,因为移动滑块以更新位于一个 table 单元格。希望有些道理。
// UISlider ViewController
override func viewDidLoad() {
super.viewDidLoad()
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
self.refreshSlider()
}
@objc func refreshSlider() {
sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
// if let chgIntValue = Int(GlobalSliderValues.changeValue)
// { sliderOutlet.setValue(Float(Double(chgIntValue)), animated: true)
// }
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(self.refreshSlider), name: Notification.Name("refreshSlider"), object: nil)
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self, name: Notification.Name("refreshSlider"), object: nil)
}
表格视图控制器
override func viewDidLoad() {
super.viewDidLoad()
mortgageAmount.addTarget(self, action: #selector(chgTextFieldDidChange(textField:)), for: UIControlEvents.editingChanged)
}
@objc func chgTextFieldDidChange(textField: UITextField)
{
if let chgStringValue = mortgageAmount.text
{
if Double(chgStringValue) ?? 1 > 10000 {
let alert = UIAlertController(title: "Input Error", message: "Value cannot be greater than 10000", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
return
}
GlobalSliderValues.minimumValue = 10
GlobalSliderValues.maximumValue = 10000
GlobalSliderValues.sliderValue = Int(mortgageAmount.text!)!
GlobalSliderValues.mortageAmountValue = Float(Int(mortgageAmount.text!)!)
NotificationCenter.default.post(name:Notification.Name("refreshSlider"), object: nil)
if let chgIntValue = Int(chgStringValue)
{ GlobalSliderValues.changeValue.setValue(Float(Double(chgIntValue)), animated: true)
}
}
}
@IBAction func valueChanged(_ sender: UISlider) {
mortgageAmount.text = String(format: "%.2f",Double(sender.value))
}
struct GlobalSliderValues {
static var minimumValue = Int()
static var maximumValue = Int()
static var lowerValue = Int()
static var UpperValue = Int()
static var locationValue = Int()
static var sliderValue = Int()
static var sliderChgValue = ""
}
我们不需要通知中心来处理滑块的刷新。由于我们使用常量来存储值,因此您的代码可以更改如下
class ViewController: UIViewController {
@IBOutlet weak var sliderOutlet: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
}
@objc func refreshSlider() {
DispatchQueue.main.async {
self.sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
self.sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
self.sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
print(self.sliderOutlet.minimumValue)
print(self.sliderOutlet.maximumValue)
print(self.sliderOutlet.value)
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.refreshSlider()
}
}
我输入的抵押贷款金额为 1098,因此滑块如下所示
我有一个视图控制器,它有一个 tableView 嵌入到 ContainerView 中,并且在 ContainerView 正下方我有一个 UISlider。我在 UISlider 的视图控制器上有代码,在另一个控制 table 视图的视图控制器上有代码。
UISlider 的属性是根据选定的文本字段设置的 - 这部分代码有效。我正在努力创建一个 function/feature ,它会在移动 UISlider 时更改 textField 值。我认为 UISlider Action 需要在控制 UISlider 的代码上,但我无法确定如何在两个 viewController 之间转换 UISlider.setvalue 的值,因为移动滑块以更新位于一个 table 单元格。希望有些道理。
// UISlider ViewController
override func viewDidLoad() {
super.viewDidLoad()
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
self.refreshSlider()
}
@objc func refreshSlider() {
sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
// if let chgIntValue = Int(GlobalSliderValues.changeValue)
// { sliderOutlet.setValue(Float(Double(chgIntValue)), animated: true)
// }
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(self.refreshSlider), name: Notification.Name("refreshSlider"), object: nil)
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self, name: Notification.Name("refreshSlider"), object: nil)
}
表格视图控制器
override func viewDidLoad() {
super.viewDidLoad()
mortgageAmount.addTarget(self, action: #selector(chgTextFieldDidChange(textField:)), for: UIControlEvents.editingChanged)
}
@objc func chgTextFieldDidChange(textField: UITextField)
{
if let chgStringValue = mortgageAmount.text
{
if Double(chgStringValue) ?? 1 > 10000 {
let alert = UIAlertController(title: "Input Error", message: "Value cannot be greater than 10000", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
return
}
GlobalSliderValues.minimumValue = 10
GlobalSliderValues.maximumValue = 10000
GlobalSliderValues.sliderValue = Int(mortgageAmount.text!)!
GlobalSliderValues.mortageAmountValue = Float(Int(mortgageAmount.text!)!)
NotificationCenter.default.post(name:Notification.Name("refreshSlider"), object: nil)
if let chgIntValue = Int(chgStringValue)
{ GlobalSliderValues.changeValue.setValue(Float(Double(chgIntValue)), animated: true)
}
}
}
@IBAction func valueChanged(_ sender: UISlider) {
mortgageAmount.text = String(format: "%.2f",Double(sender.value))
}
struct GlobalSliderValues {
static var minimumValue = Int()
static var maximumValue = Int()
static var lowerValue = Int()
static var UpperValue = Int()
static var locationValue = Int()
static var sliderValue = Int()
static var sliderChgValue = ""
}
我们不需要通知中心来处理滑块的刷新。由于我们使用常量来存储值,因此您的代码可以更改如下
class ViewController: UIViewController {
@IBOutlet weak var sliderOutlet: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
sliderOutlet.isContinuous = true
sliderOutlet.tintColor = UIColor.green
}
@objc func refreshSlider() {
DispatchQueue.main.async {
self.sliderOutlet.minimumValue = Float(GlobalSliderValues.minimumValue)
self.sliderOutlet.maximumValue = Float(GlobalSliderValues.maximumValue)
self.sliderOutlet.value = Float(GlobalSliderValues.sliderValue)
print(self.sliderOutlet.minimumValue)
print(self.sliderOutlet.maximumValue)
print(self.sliderOutlet.value)
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.refreshSlider()
}
}
我输入的抵押贷款金额为 1098,因此滑块如下所示