37

我想检测 UITextField 上的触摸动作。

触摸文本字段内部似乎不会触发“Touch Up Inside”动作。

4

11 回答 11

78

似乎没有启用“Touch Up Inside” UITextField，但“Touch Down”有效。

所以解决方法如下：

斯威夫特 4.x

myTextField.addTarget(self, action: #selector(myTargetFunction), for: .touchDown)
@objc func myTargetFunction(textField: UITextField) {
    print("myTargetFunction")
}

斯威夫特 3.x

myTextField.addTarget(self, action: #selector(myTargetFunction), for: UIControlEvents.touchDown)

@objc func myTargetFunction(textField: UITextField) {
    print("myTargetFunction")
}
于 2015-08-28T00:23:15.407 回答
38

Swift 4 及更高版本：

class ViewController: UIViewController, UITextFieldDelegate {
    func textFieldDidBeginEditing(_ textField: UITextField) {
        if textField == myTextField {
            print("You edit myTextField")
        }
    }
}

这是一个委托函数。

于 2017-10-20T09:06:46.623 回答
13

这是 Swfit：

而且您不需要使用“touchUpInside”，只需使用委托方法，如下所示：

使您的视图控制器成为委托：

class ViewController: UIViewController, UITextFieldDelegate{

func textFieldDidBeginEditing(textField: UITextField) -> Bool {
    if textField == myTextField {
        return true // myTextField was touched
    }
}

这是其他委托方法：

protocol UITextFieldDelegate : NSObjectProtocol {

    optional func textFieldShouldBeginEditing(textField: UITextField) -> Bool // return NO to disallow editing.
    optional func textFieldDidBeginEditing(textField: UITextField) // became first responder
    optional func textFieldShouldEndEditing(textField: UITextField) -> Bool // return YES to allow editing to stop and to resign first responder status. NO to disallow the editing session to end
    optional func textFieldDidEndEditing(textField: UITextField) // may be called if forced even if shouldEndEditing returns NO (e.g. view removed from window) or endEditing:YES called

    optional func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool // return NO to not change text

    optional func textFieldShouldClear(textField: UITextField) -> Bool // called when clear button pressed. return NO to ignore (no notifications)
    optional func textFieldShouldReturn(textField: UITextField) -> Bool // called when 'return' key pressed. return NO to ignore.
}

来自快速文档：

struct UIControlEvents : RawOptionSetType {
    init(_ rawValue: UInt)
    init(rawValue: UInt)

    static var TouchDown: UIControlEvents { get } // on all touch downs
    static var TouchDownRepeat: UIControlEvents { get } // on multiple touchdowns (tap count > 1)
    static var TouchDragInside: UIControlEvents { get }
    static var TouchDragOutside: UIControlEvents { get }
    static var TouchDragEnter: UIControlEvents { get }
    static var TouchDragExit: UIControlEvents { get }
    static var TouchUpInside: UIControlEvents { get }
    static var TouchUpOutside: UIControlEvents { get }
    static var TouchCancel: UIControlEvents { get }

    static var ValueChanged: UIControlEvents { get } // sliders, etc.

    static var EditingDidBegin: UIControlEvents { get } // UITextField
    static var EditingChanged: UIControlEvents { get }
    static var EditingDidEnd: UIControlEvents { get }
    static var EditingDidEndOnExit: UIControlEvents { get } // 'return key' ending editing

    static var AllTouchEvents: UIControlEvents { get } // for touch events
    static var AllEditingEvents: UIControlEvents { get } // for UITextField
    static var ApplicationReserved: UIControlEvents { get } // range available for application use
    static var SystemReserved: UIControlEvents { get } // range reserved for internal framework use
    static var AllEvents: UIControlEvents { get }
}

UITextField 不响应“touchUpInside”见右侧，你会发现它是可接受的控制事件

于 2015-08-27T23:56:24.950 回答
11

更新 Swift 3

这是 Swift 3 的代码：

myTextField.addTarget(self, action: #selector(myTargetFunction), for: .touchDown)

这是功能：

func myTargetFunction() {
    print("It works!")
}
于 2017-02-15T05:56:24.817 回答
10

我参考了Apple 的 UIControlEvents 文档并提出了以下内容：

首先将 UITextFieldDelegate 添加到您的课程中，

textBox.delegate = self
textBox.addTarget(self, action: #selector(TextBoxOn(_:)),for: .editingDidBegin)
textBox.addTarget(self, action: #selector(TextBoxOff(_:)),for: .editingDidEnd)

具有以下功能：

func TextBoxOff(_ textField: UITextField) {
     code
         }                
}

func TextBox(_ textField: UITextField) {
    code
         }
}
于 2017-06-10T16:20:10.517 回答
8

对于 Swift 3.1：

1）创建手势识别器：

let textViewRecognizer = UITapGestureRecognizer()

2）向识别器添加处理程序：

textViewRecognizer.addTarget(self, action: #selector(tappedTextView(_:)))

3）将识别器添加到您的文本视图中：

textView.addGestureRecognizer(textViewRecognizer)

4）将处理程序添加到您的类：

func tappedTextView(_ sender: UITapGestureRecognizer) {
        print("detected tap!")
}
于 2017-05-24T17:04:57.547 回答
6

为了使这一点更清楚一点，这些东西需要到位。我用它来做到这一点，因此如果用户在我自己的信用应用程序中输入了某些textField内容，则借方中的任何内容textField都会被删除。

  1. UITextFieldDelegate需要在 View 控制器中声明，即类 SecondViewController：
  2. 检测器函数 func myDebitDetector func myCreditDetector需要在 ViewController 类中。

  3. 将debit.addTarget 和 credit.addtarget放入视图中。

  4. @IBOutlet 弱变量借记：UITextField！ 和 @IBOutlet 弱变量信用：UITextField！是故事板上的文本字段并连接到 viewController。

    class SecondViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {

@IBOutlet weak var credit: UITextField!
@IBOutlet weak var debit: UITextField!

    func myDebitDetector(textfield: UITextField ){
        print("using debit")
        credit.text = ""

    }

    func myCreditDetector(textfield: UITextField) {
        print("using cedit")
        debit.text = ""
    }

    override func viewWillAppear(animated: Bool) {



        debit.addTarget(self, action: "myDebitDetector:", forControlEvents: UIControlEvents.TouchDown)
        credit.addTarget(self, action: "myCreditDetector:", forControlEvents: UIControlEvents.TouchDown)
    ....

    }
}
于 2016-03-01T02:50:36.137 回答
3

将 UITextField 委托设置为您的视图控制器

对象-C

textField.delegate = self;

迅速

textField.delegate = self

实现委托方法

对象-c

-(void)textField:(UITextField*)textField didBeginEditing {
   // User touched textField
}

迅速

func textFieldDidBeginEditing(textField: UITextField!) {    //delegate method

}
于 2015-08-27T23:54:56.760 回答
2

斯威夫特 3.0 版本：

textFieldClientName.addTarget(self, action: Selector(("myTargetFunction:")), for: UIControlEvents.touchDown)
于 2017-02-07T16:51:06.230 回答
1

斯威夫特 4.2。

尝试.editingDidEnd而不是.touchDown和delegate。

myTextField.addTarget(self, action: #selector(myTargetFunction), for: .editingDidEnd)

@objc func myTargetFunction(textField: UITextField) {
    print("textfield pressed")
}
于 2019-02-07T14:06:57.733 回答
0

在 xamarin.iOS 我易于使用：

YourTextField.WeakDelegate = this;

[...]

[Export("textFieldDidBeginEditing:")]
public void TextViewChanged(UITextField textField)
{
    if (YourTextField.Equals(textField))
        IsYourTextFileFocused = true;
}
于 2019-12-23T09:22:10.167 回答