swift 中的 UITextField 上的 UILongPressGestureRecognizer

Question

是否可以在不触发字段编辑的情况下在 UITextField 上使用 UILongPressGestureRecognizer，同时仍然能够通过常规点击编辑文本字段？

我尝试将长按手势识别器添加到 UITextField，但长按似乎只在一小部分时间内起作用。

init(frame: CGRect, userCompany: WLUserCompany) {
    super.init(frame: frame)

    var textField: UITextField?

    var longPress = UILongPressGestureRecognizer(target: self, action: #selector(self.longPress(gesture:)))
    textField?.addGestureRecognizer(longPress)

    self.addSubview(textField!)
}


@objc func longPress(gesture: UILongPressGestureRecognizer) {            
    if gesture.state == UIGestureRecognizerState.began {
        print("Long Press")
    }
}

Answer 1

在查看了类似的 SO here and here 并亲自试验后，我认为这是不可能的——至少你描述意图的方式是这样。

我能够添加带有手势控制的背景视图，但手势与文本字段上的用户交互冲突。文本字段旁边的按钮不会创造更好的用户体验吗？

FWIW，这是使用双击添加背景的代码 UIView。长按手势有相同的结果

 @IBOutlet weak var backgroundView: UIView!
    @IBOutlet weak var textField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.myTextFieldTapped))
        tapGesture.numberOfTapsRequired = 2
        backgroundView.addGestureRecognizer(tapGesture)
    }

    @objc func myTextFieldTapped() {
        print("Double tapped on textField")
    }

这是故事板的图片：

Answer 2

创建 UIGestureRecognizer 的子类

import UIKit.UIGestureRecognizerSubclass

class TouchGestureRecognizer: UIGestureRecognizer {

    var isLongPress: Bool = false
    fileprivate var startDateInterval: TimeInterval = 0

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
        state = .began
        self.startDateInterval = Date().timeIntervalSince1970
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesEnded(touches, with: event)
        state = .ended
        self.isLongPress = (Date().timeIntervalSince1970 - self.startDateInterval) > 1.0
    }
}

将手势 recognizer 添加到您的 textField

let gesture = TouchGestureRecognizer(target: self, action: #selector(ViewController.textFiledPressed(gesture:)))
        self.textField?.addGestureRecognizer(gesture)

现在您可以检查 textFiledPressed(gesture:) 功能是否长按

func textFiledPressed(gesture: TouchGestureRecognizer) {
    switch gesture.state {
    case .ended:
        if gesture.isLongPress {
            //Do whatever you need
        } else {
            self.textField?.becomeFirstResponder()
        }

    default: break
    }

}

swift 中的 UITextField 上的 UILongPressGestureRecognizer

UILongPressGestureRecognizer over UITextField in swift

iphone

uitextfield

uigesturerecognizer

ios

swift