objective c - Dismiss modal form sheet view on outside tap iOS 8

Question

I've been trying to dismiss the modal form sheet view on outside tap on iOS 8 with no luck, I've tried this code

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];

- (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];
    }
 }
}

But it doesn't detect outside view clicks, any suggestions ?

Answer 1

There are actually two problems in iOS 8. First, the gesture recognition does not begin.

I solved this by adding the UIGestureRecognizerDelegate protocol and implementing

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer*)otherGestureRecognizer
{
    return YES;
}

Also, don't forget to register the delegate with

recognizer.delegate = self;

Now the gesture recognizer should recognize gestures and the target method (handleTapBehind:) will be called.

Here comes the second problem in iOS 8: locationInView: doesn't seem to take the device orientation into account if nil is passed as a view. Instead, passing the root view works.

Here's my target code that seems to work for iOS 7.1 and 8.0:

if (sender.state == UIGestureRecognizerStateEnded) {
    UIView *rootView = self.view.window.rootViewController.view;
    CGPoint location = [sender locationInView:rootView];
    if (![self.view pointInside:[self.view convertPoint:location fromView:rootView] withEvent:nil]) {
        [self dismissViewControllerAnimated:YES completion:^{
            [self.view.window removeGestureRecognizer:sender];
        }];
    }
}