ios 如何在 UITextField 返回键上添加操作？
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how to add an action on UITextField return key?
提问by razibdeb
I have a button and text textfield in my view. when i click on the textfield a keyboard appears and i can write on the textfield and i also able to dismiss the keyboard by clicking on the button by adding:
我的视图中有一个按钮和文本文本字段。当我单击文本字段时，会出现一个键盘，我可以在文本字段上书写，我还可以通过添加以下按钮来关闭键盘：
[self.inputText resignFirstResponder];
Now I want to enable return key of keyboard. when i will press on the keyboard keyboard will disappear and something will happen. How can I do this?
现在我想启用键盘的返回键。当我按下键盘时键盘会消失并且会发生一些事情。我怎样才能做到这一点？
回答by Ander
Ensure "self" subscribes to UITextFieldDelegateand initialise inputText with:
确保“self”订阅UITextFieldDelegate并初始化 inputText ：
self.inputText.delegate = self;
Add the following method to "self":
将以下方法添加到“self”：
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if (textField == self.inputText) {
[textField resignFirstResponder];
return NO;
}
return YES;
}
Or in Swift:
或者在 Swift 中：
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == inputText {
textField.resignFirstResponder()
return false
}
return true
}
回答by Fangming
With extension style in swift 3.0
使用 swift 3.0 中的扩展样式
First, set up delegate for your text field.
首先，为您的文本字段设置委托。
override func viewDidLoad() {
super.viewDidLoad()
self.inputText.delegate = self
}
Then conform to UITextFieldDelegatein your view controller's extension
然后UITextFieldDelegate在您的视图控制器的扩展中符合
extension YourViewController: UITextFieldDelegate {
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == inputText {
textField.resignFirstResponder()
return false
}
return true
}
}
回答by Malfunction
While the other answers work correctly, I prefer doing the following:
虽然其他答案正常工作，但我更喜欢执行以下操作：
In viewDidLoad(), add
在 viewDidLoad() 中，添加
self.textField.addTarget(self, action: #selector(onReturn), for: UIControl.Event.editingDidEndOnExit)
self.textField.addTarget(self, action: #selector(onReturn), for: UIControl.Event.editingDidEndOnExit)
and define the function
并定义函数
@IBAction func onReturn() {
self.textField.resignFirstResponder()
// do whatever you want...
}
回答by Adobels
Use Target-Action UIKit mechanism for "primaryActionTriggered" UIEvent sent from UITextField when a keyboard done button is tapped.
当点击键盘完成按钮时，将 Target-Action UIKit 机制用于从 UITextField 发送的“primaryActionTriggered”UIEvent。
textField.addTarget(self, action: Selector("actionMethodName"), for: .primaryActionTriggered)
