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iOS拖动UIImageView

发布于 2024-11-17 08:02:00 字数 108 浏览 4 评论 0原文

好吧，所以我一直想知道如何实际拾取图像视图并拖动它。我正在计划当我拖动图像视图时，当用户将其放置到正确的位置时，它会锁定在那里。我真的不知道该怎么做，这已经困扰我一段时间了。

非常感谢！

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这样的小城市 2024-11-24 08:02:00

或者，如果您不想子类化视图并自己处理触摸，则可以使用 UIPanGestureRecognizer。

在任何类（例如视图控制器）中创建一个平移识别器并将其添加到您的视图中：

UIPanGestureRecognizer * panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                                                 action:@selector(handlePanGesture:)];
[myDraggedView addGestureRecognizer:panRecognizer];

然后简单地说：

- (void)handlePanGesture:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGRect frame = myDraggedView.frame;
    frame.origin = [gestureRecognizer locationInView:myDraggedView.superview];
    myDraggedView.frame = frame;
}

如果您像我一样喜欢 Interface Builder，您也可以将平移手势识别器拖到图像视图上，然后连接handlePanGesture: 的识别器应声明为 IBAction 而不是 void。

Or you can use a UIPanGestureRecognizer if you don't want to subclass the view and handle touches yourself.

Create a pan recognizer in any class (e.g. view controller) and add it to your view:

UIPanGestureRecognizer * panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                                                 action:@selector(handlePanGesture:)];
[myDraggedView addGestureRecognizer:panRecognizer];

And then simply:

- (void)handlePanGesture:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGRect frame = myDraggedView.frame;
    frame.origin = [gestureRecognizer locationInView:myDraggedView.superview];
    myDraggedView.frame = frame;
}

If you like Interface Builder as much as me you can also just drag a pan gesture recognizer over your image view, and then connect the recognizer to the handlePanGesture: that should be declared as an IBAction instead of void.

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多像笑话 2024-11-24 08:02:00

如果您喜欢阅读，请查看 UIResponder 类参考，特别是 touchesBegan 和 touchesMoved。

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泪是无色的血 2024-11-24 08:02:00

我已经使用过这个，但是用户可以自由地将 imageview 拖动到他们想要的位置。这是我的 swift 自定义类

class DraggableImageView: UIImageView {
      var beganPoint: CGPoint? = nil
      var originCenter: CGPoint? = nil
      override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
           if let position = touches.first?.location(in: superview){
                beganPoint = position
                originCenter = center
           }
      }
      override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
      }
      override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
           if let position = touches.first?.location(in: superview){
                let newPosition = CGPoint(x: position.x - (beganPoint?.x)!, y: position.y - (beganPoint?.y)!)
                center = CGPoint(x: (originCenter?.x)! + newPosition.x, y: (originCenter?.y)! + newPosition.y)
           }
      }
}

只需将这个自定义类与您的 UIImageView 一起使用

I already worked with this, but the user can drag imageview freely with position that they want. and this is my custom class with swift

class DraggableImageView: UIImageView {
      var beganPoint: CGPoint? = nil
      var originCenter: CGPoint? = nil
      override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
           if let position = touches.first?.location(in: superview){
                beganPoint = position
                originCenter = center
           }
      }
      override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
      }
      override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
           if let position = touches.first?.location(in: superview){
                let newPosition = CGPoint(x: position.x - (beganPoint?.x)!, y: position.y - (beganPoint?.y)!)
                center = CGPoint(x: (originCenter?.x)! + newPosition.x, y: (originCenter?.y)! + newPosition.y)
           }
      }
}

Just user this custom class with your UIImageView

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~没有更多了~