Detect Touch outside a view

gistfile1.m

@property (nonatomic, strong) UITapGestureRecognizer *gesture;

//==========================================================================================
- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    self.gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
    self.gesture.numberOfTapsRequired = 1;
    self.gesture.numberOfTouchesRequired = 1;
    self.gesture.delegate = self;
    [self.gesture setCancelsTouchesInView:NO];
    [self.view.window addGestureRecognizer:self.gesture];
}

//==========================================================================================
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    CGPoint point = [touch locationInView:nil];

    UIWindow *mainWindow = [[[UIApplication sharedApplication] delegate] window];
    CGPoint pointInSubview = [self.view convertPoint:point fromView:mainWindow];
    if (!CGRectContainsPoint(self.view.frame, pointInSubview)) {
        [self close:self];
        return NO;
    }
    return YES; // handle the touch
}

//==========================================================================================
- (void)handleTap:(UITapGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded) {
        return;
    }
    // Handle the tap if you want to
}

//==========================================================================================
#pragma mark - Close modal
- (IBAction)close:(id)sender
{
    self.gesture.delegate = nil;
    [self.view.window removeGestureRecognizer:self.gesture];
    [self dismissViewControllerAnimated:YES completion:^{
    }];
}