ios Swift UITextFieldShouldReturn Return Key Tap
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Swift UITextFieldShouldReturn Return Key Tap
提问by kmiklas
(iOS8, Xcode6, Swift) Using Swift, how do I capture a tap on the "Return" button?
(iOS8, Xcode6, Swift) 使用 Swift，我如何捕捉对“返回”按钮的点击？
The doc at the following link specifies using the textFieldShouldReturnmethod:
以下链接中的文档指定使用该textFieldShouldReturn方法：
// Swift
@optional func textFieldShouldReturn(_ textField: UITextField!) -> Bool
Where I'm hung up is in the "_ textField" part. I've created the text field using Storyboard. How do I capture notifications for this specific text field? Do I need to create a new class and set it as a delegate for this text field? Do I assign the text filed a name, and then somehow hook into it?
我挂断的地方是在“_ textField”部分。我已经使用 Storyboard 创建了文本字段。如何捕获此特定文本字段的通知？我是否需要创建一个新类并将其设置为该文本字段的委托？我是否为提交的文本指定一个名称，然后以某种方式挂入其中？
https://developer.apple.com/documentation/uikit/uitextfielddelegate/1619603-textfieldshouldreturn
https://developer.apple.com/documentation/uikit/uitextfielddelegate/1619603-textfieldshouldreturn
回答by jayesh kavathiya
class ViewController: UIViewController,UITextFieldDelegate //set delegate to class
@IBOutlet var txtValue: UITextField //create a textfile variable
override func viewDidLoad() {
super.viewDidLoad()
txtValue.delegate = self //set delegate to textfile
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
回答by sijones
Implement this function
实现这个功能
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
And for delegate you can set using the Utilities pane / Connections Inspector / delegateand then drag to ViewController (yellow button in the storyboard)
对于委托，您可以使用Utilities 窗格/Connections Inspector/delegate 进行设置，然后拖动到 ViewController（故事板中的黄色按钮）
Then you do not need to set the delegate programmatically for every text field
然后您不需要为每个文本字段以编程方式设置委托
回答by Ben Gottlieb
You need to set an object as the text field's delegate. Usually that would be the view controller that the text field exists in. You don't need to inherit from any other class, or, strictly speaking, implement a delegate (but you could implement UITextFieldDelegate to make things a little clearer.)
您需要将一个对象设置为文本字段的委托。通常那将是文本字段所在的视图控制器。您不需要从任何其他类继承，或者，严格来说，实现一个委托（但您可以实现 UITextFieldDelegate 以使事情更清楚一些。）
回答by iOS
In Swift 4.2 and Xcode 10.1
在 Swift 4.2 和 Xcode 10.1 中
//UITextField delegate method
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == TF1 {
textField.resignFirstResponder()//
TF2.becomeFirstResponder()//TF2 will respond immediately after TF1 resign.
} else if textField == TF2 {
textField.resignFirstResponder()
TF3.becomeFirstResponder()//TF3 will respond first
} else if textField == TF3 {
textField.resignFirstResponder()
}
return true
}
