可拖动标签 - ios [英] Draggable label - ios
问题描述
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了该标签。我使用了touchesMoved方法(Swift 2)。下面是我的代码
I have a requirement to move a label around only when the user touches on it and drags. I cant find out whether the user touched that label or not. I have used the touchesMoved method(Swift 2). Below is my code
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,我的标签不动:(
有人帮我请
When I do this, my label is not moving :( someone help me please
推荐答案
我一直在想你的问题,这是我的结果,你需要继承 UILabel
并且 init
你需要设置 userInteractionEnabled = true
然后重写此方法覆盖func touchesMoved( touches:设置< UITouch> ;,withEvent事件:UIEvent?)
好吧,我的代码是这样的:
I had been thinking in your question, and this is my result, you need to subclass UILabel
and in the init
you need to set userInteractionEnabled = true
and then override this method override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?)
well, my code is this:
Swift 3.1 Code
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?) {
}
}
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.redColor().CGColor
self.userInteractionEnabled = true
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.first;
let location = touch?.locationInView(self.superview);
if(location != nil)
{
self.frame.origin = CGPointMake(location!.x-self.frame.size.width/2, location!.y-self.frame.size.height/2);
}
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
}
希望这对你有所帮助,对我来说效果很好,这就是它的工作方式
Hope this helps you, for me works great, this is how it works
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