Iphone SDK 通过单击 iPad 上的模态视图 Controller 外部来关闭它

Question

当用户点击模态视图之外时，我想关闭 FormSheetPresentation 模态视图 Controller ...我见过很多应用程序这样做(例如 ipad 上的 eBay)，但我不知道如何实现，因为下面的 View 是当模态视图像这样显示时禁用触摸(他们是否将其呈现为弹出窗口？)...有人有任何建议吗？

Answer 1

我晚了一年，但这很简单。

让模态视图 Controller 将手势识别器附加到 View 的窗口:

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapBehind:)];

[recognizer setNumberOfTapsRequired:1];
recognizer.cancelsTouchesInView = NO; //So the user can still interact with controls in the modal view
[self.view.window addGestureRecognizer:recognizer];
[recognizer release];

处理代码:

- (void)handleTapBehind:(UITapGestureRecognizer *)sender
{
    if (sender.state == UIGestureRecognizerStateEnded)
     {
       CGPoint location = [sender locationInView:nil]; //Passing nil gives us coordinates in the window

 //Then we convert the tap's location into the local view's coordinate system, and test to see if it's in or outside. If outside, dismiss the view.

        if (![self.view pointInside:[self.view convertPoint:location fromView:self.view.window] withEvent:nil]) 
        {
           // Remove the recognizer first so it's view.window is valid.
          [self.view.window removeGestureRecognizer:sender];
          [self dismissModalViewControllerAnimated:YES];
        }
     }
}

就是这样。天哪，这是一个有用且通常直观的行为。