Intercepting shake events

UIApplication+GFInterceptEvents.m

@implementation UIApplication (GFInterceptEvents)
+ (void)lookback_swizzleSendEvent
{
    Method orig = class_getInstanceMethod([UIApplication class], @selector(sendEvent:));
    Method repl = class_getInstanceMethod([UIApplication class], @selector(lookback_sendEvent:));
    method_exchangeImplementations(orig, repl);
}

- (void)lookback_sendEvent:(UIEvent*)event
{
    [self lookback_sendEvent:event];
    
    if(event.type == UIEventTypeTouches) {
        [[NSNotificationCenter defaultCenter] postNotificationName:GFInterceptedTouchNotification object:nil userInfo:@{
            GFInterceptedEventUserInfoKey: event
        }];
    } else if(event.type == UIEventTypeMotion && event.subtype == UIEventSubtypeMotionShake) {
        [[NSNotificationCenter defaultCenter] postNotificationName:GFInterceptedShakeNotification object:nil userInfo:@{
            GFInterceptedEventUserInfoKey: event
        }];
    }
}
@end