可拖动标签 - ios

Question

我要求只在用户触摸并拖动时才移动标签。我无法确定用户是否触摸过该标签。我使用了touchesMoved方法（Swift 2）。以下是我的代码

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    super.touchesBegan(touches as Set<UITouch>, withEvent: event) 
    let touch = touches.first

  if (touch!.view) == (moveLabel as UIView) // moveButton is my label
  {
    location = touch!.locationInView(self.view)
    moveLabel.center = location
  }
}

当我这样做时，我的标签没有移动:( 有人帮帮我

Answer 1

我一直在思考你的问题，这是我的结果，你需要继承UILabel并在init中设置userInteractionEnabled = true，然后覆盖此方法{{ 1}}好吧，我的代码是这样的：

Swift 3.1代码

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?)

Swift 2.2代码

import UIKit

class draggableLabel: UILabel {


    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.layer.borderWidth = 1
        self.layer.borderColor = UIColor.red.cgColor
        self.isUserInteractionEnabled = true
    }



    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first;
        let location = touch?.location(in: self.superview);
        if(location != nil)
        {
        self.frame.origin = CGPoint(x: location!.x-self.frame.size.width/2, y: location!.y-self.frame.size.height/2);
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

    }

}

希望这对你有所帮助，对我来说效果很好，这就是它的工作原理