Why does UINavigationBar steal touch events?

Question

I have a custom UIButton with UILabel added as subview. Button perform given selector only when I touch it about 15points lower of top bound. And when I tap above that area

Answer 1

Extending Alexander's solution:

Step 1. Subclass UIWindow

@interface ChunyuWindow : UIWindow {
    NSMutableArray * _views;

@private
    UIView *_touchView;
}

- (void)addViewForTouchPriority:(UIView*)view;
- (void)removeViewForTouchPriority:(UIView*)view;

@end
// .m File
// #import "ChunyuWindow.h"

@implementation ChunyuWindow
- (void) dealloc {
    TT_RELEASE_SAFELY(_views);
    [super dealloc];
}


- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    if (UIEventSubtypeMotionShake == motion
        && [TTNavigator navigator].supportsShakeToReload) {
        // If you're going to use a custom navigator implementation, you need to ensure that you
        // implement the reload method. If you're inheriting from TTNavigator, then you're fine.
        TTDASSERT([[TTNavigator navigator] respondsToSelector:@selector(reload)]);
        [(TTNavigator*)[TTNavigator navigator] reload];
    }
}

- (void)addViewForTouchPriority:(UIView*)view {
    if ( !_views ) {
        _views = [[NSMutableArray alloc] init];
    }
    if (![_views containsObject: view]) {
        [_views addObject:view];
    }
}

- (void)removeViewForTouchPriority:(UIView*)view {
    if ( !_views ) {
        return;
    }

    if ([_views containsObject: view]) {
        [_views removeObject:view];
    }
}

- (void)sendEvent:(UIEvent *)event {
    if ( !_views || _views.count == 0 ) {
        [super sendEvent:event];
        return;
    }

    UITouch *touch = [[event allTouches] anyObject];
    switch (touch.phase) {
        case UITouchPhaseBegan: {
            for ( UIView *view in _views ) {
                if ( CGRectContainsPoint(view.frame, [touch locationInView:[view superview]]) ) {
                    _touchView = view;
                    [_touchView touchesBegan:[event allTouches] withEvent:event];
                    return;
                }
            }
            break;
        }
        case UITouchPhaseMoved: {
            if ( _touchView ) {
                [_touchView touchesMoved:[event allTouches] withEvent:event];
                return;
            }
            break;
        }
        case UITouchPhaseCancelled: {
            if ( _touchView ) {
                [_touchView touchesCancelled:[event allTouches] withEvent:event];
                _touchView = nil;
                return;
            }
            break;
        }
        case UITouchPhaseEnded: {
            if ( _touchView ) {
                [_touchView touchesEnded:[event allTouches] withEvent:event];
                _touchView = nil;
                return;
            }
            break;
        }

        default: {
            break;
        }
    }

    [super sendEvent:event];
}

@end

Step 2: Assign ChunyuWindow instance to AppDelegate Instance

Step 3: Implement touchesEnded:widthEvent: for view with buttons, for example:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded: touches withEvent: event];

    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView: _buttonsView]; // a subview contains buttons
    for (UIButton* button in _buttons) {
        if (CGRectContainsPoint(button.frame, point)) {
            [self onTabButtonClicked: button];
            break;
        }
    }    
}

Step 4: call ChunyuWindow's addViewForTouchPriority when the view we care about appears, and call removeViewForTouchPriority when the view disappears or dealloc, in viewDidAppear/viewDidDisappear/dealloc of ViewControllers, so _touchView in ChunyuWindow is NULL, and it is the same as UIWindow, having no side effects.