Question

我有一个UIView。在这个视图中，我添加了UIScrollView.And scrollview包含一个UIButton.Everything是通过编程方式创建的。最初滚动视图的内容大小与视图大小相同。用户可以在内部拖动按钮。现在如果按钮到达滚动视图的角落或任何一侧。如果在那里拖动超过1秒，滚动视图的内容大小应该在那边增加。我对这种技术或使用哪种方法没有任何想法，我们可以得到它。请帮助我。任何暗示都将受到赞赏。谢谢你。

Answer 1

您必须为您的UIButton添加UIPangesture识别器。牧场识别器的句柄需要改变UIButton框架以及UIScrollview框架。采取此示例计划供您参考。

 UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
 [myButton setUserInteractionEnabled:YES];
 [myButton addGestureRecognizer:panGesture];

你的句柄方法应该是这样的，

    -(IBAction)handlePanGesture:(UIPanGestureRecognizer *)sender
    {
     CGPoint translation = [sender translationInView:self.view];
     sender.view.center = CGPointMake(sender.view.center.x + translation.x, 
                                         sender.view.center.y + translation.y);
    [sender setTranslation:CGPointMake(0, 0) inView:self.view];

     //And check  sender x,y position with your `scrollview`,if it is crossed then you have to reset the `contentOffset`
     // Do the calculation like this
    if([sender.view.center].x>yourScrollviewXposition)
    {
  coordforX=([sender.view.center].x + translation.x);
  coordforY=([sender.view.center].y + translation.y);
//based on your calculated x, y position you have to calculate scrollview width and height
  [yourScrollView setContentSize:CGSizeMake(width,height)];
   }
 }

拖动对象时增加UIScrollView的内容大小

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