Question

我想用ipad摇动更改子视图大小，我有UIView包含子视图如何检测摇动并根据它做出响应

任何建议

Answer 1

How to detect iphone shake gesture one time !

并且在检测到震动后，调用将改变视图大小的动作。例如，[myview setFrame:CGRectMake(0,0,150,150)];

Answer 2

Apple有一个关于如何处理这些问题的小部分：Motion Events。基本上，您可以从继承自UIResonder的任何类中覆盖三种不同的方法：

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {

}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {    
    [UIView beginAnimations:nil context:nil];    
    [UIView setAnimationDuration:0.5];

    self.view.transform = CGAffineTransformIdentity;

    for (UIView *subview in self.view.subviews) {    
        subview.transform = CGAffineTransformIdentity;
    }

    [UIView commitAnimations];

    for (TransformGesture *gesture in [window allTransformGestures]) {    
        [gesture resetTransform];    
    }    
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {

}

Answer 3

有motion events作为UIEvents传递，您可以利用它们。一旦动作结束并且您已捕获摇动事件，您可以根据需要调整视图大小。

Answer 4

如果您定位iOS 3.0及更高版本，则可以使用摇动设备生成UIEvent子类型UIEventSubtypeMotionShake的事实。 Event Handling Guide: Motion Events - Shaking-Motion Events

您的UIView应该覆盖以下方法：

- (BOOL)canBecomeFirstResponder
{
  return YES;
}

- (void)viewDidAppear:(BOOL)animated
{
  [self becomeFirstResponder];
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
   // Clean what you need to
}

- (void) motionEnded:(UIEventSubType)motion withEvent:(UIEvent *)event
{
   if (UIEventSubtypeMotionShake == motion)
   {
      // Resize your view
   }
   else
   {
     [super motionEnded:motion withEvent:event];
   }
}

如何用摇动来改变uiview的大小

4 个答案: