在swift中使用UITextField的UILongPressGestureRecognizer

Question

是否可以在UITextField上使用UILongPressGestureRecognizer而不会触发字段编辑，同时仍能在常规点击中编辑文本字段？

我尝试在UITextField中添加长按手势识别器，但长按似乎只能在很短的时间内完成。

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

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
    }
}

向您的recognizer

添加提示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
    }

}

Answer 2

在查看类似的SO here和here并尝试自己之后，我认为这是不可能的 - 至少就是您描述意图的方式。

我能够使用手势控制添加背景视图，但手势与文本字段上的用户交互冲突。不会在文本字段旁边的按钮创建更好的用户体验吗？

FWIW，这是使用双击添加背景UIView的代码。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")
    }

以下是故事板的图片：