Iphone IOS:在父视图上移动子视图

我是IOS的新手。 在我的应用程序中，每次用户绘制圆时，我都会创建圆的新子视图。 创建圆后，我希望用户能够在父视图上拖动圆。

---

如果用户创建多个圆，我如何知道触摸了哪个圆，并在屏幕上拖动此特定圆。

您可以将平移手势添加到您要移动的对象：

// Add UIPanGestureRecognizer to each circle view u add and set a tag for each circle
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]  initWithTarget: self   action: @selector(handlePan:)];
[view addGestureRecognizer:   panRecognizer];


-(void) handlePan: (UIGestureRecognizer *)sender
{
  UIPanGestureRecognizer *panRecognizer = (UIPanGestureRecognizer *)sender;
  UIView *view = sender.view;
// You can get to know which circle was moved by getting tag of this view
  if (panRecognizer.state == UIGestureRecognizerStateBegan ||
      panRecognizer.state ==  UIGestureRecognizerStateChanged)
  {
    CGPoint currentPoint = self.center;
    CGPoint translation =    [panRecognizer translationInView:     self.superView];
    view.center = CGPointMake(currentPoint.x + translation.x,  currentPoint.y + translation.y);
    [panRecognizer setTranslation: CGPointZero inView: self.view];
  }
} 

---

您可以将平移手势添加到要移动的对象：

// Add UIPanGestureRecognizer to each circle view u add and set a tag for each circle
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc]  initWithTarget: self   action: @selector(handlePan:)];
[view addGestureRecognizer:   panRecognizer];


-(void) handlePan: (UIGestureRecognizer *)sender
{
  UIPanGestureRecognizer *panRecognizer = (UIPanGestureRecognizer *)sender;
  UIView *view = sender.view;
// You can get to know which circle was moved by getting tag of this view
  if (panRecognizer.state == UIGestureRecognizerStateBegan ||
      panRecognizer.state ==  UIGestureRecognizerStateChanged)
  {
    CGPoint currentPoint = self.center;
    CGPoint translation =    [panRecognizer translationInView:     self.superView];
    view.center = CGPointMake(currentPoint.x + translation.x,  currentPoint.y + translation.y);
    [panRecognizer setTranslation: CGPointZero inView: self.view];
  }
} 

---

我已经成功地实现了我想要实现的目标。我在我的

圆圈中覆盖
touchmoved
方法

子视图

并在那里输入此行：

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];

    self.center = [mytouch locationInView:self.superview];

}

---

现在，创建的每个

圆圈

，我都可以将其与屏幕一起拖动。

我已经成功实现了我想要实现的目标。我在我的

圆圈中覆盖
touchmoved
方法

子视图

并在那里输入此行：

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *mytouch=[[touches allObjects] objectAtIndex:0];

    self.center = [mytouch locationInView:self.superview];

}

---

现在，每个创建的

圆圈

，我都可以将其与屏幕一起拖动。

你的圆圈应该是一个视图，因此给你的圆圈添加标签，并根据标签区分每个圆圈获取标签。但我还是不能移动它们为什么你能显示一些代码？我想我找到了一个非常简单和优雅的方法。你的圆圈应该是一个视图，所以给你的圆圈贴上标签，并根据标签区分。每个圆圈都要贴上标签。但我还是不能移动它们为什么你能显示一些代码？我想我找到了一个非常简单和优雅的方法。我会贴出来的。