如何監聽app所有事件

1， 修改main方法

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, NSStringFromClass([AppDelegate class]), NSStringFromClass([AppDelegate class]));
    }
}

2， 讓   AppDelegate繼承自UIApplication，原來是繼承自UIResponder

@interface AppDelegate : UIApplication <UIApplicationDelegate>

3， 在AppDelegate中實現   sendEvent方法

- (void)sendEvent:(UIEvent *)event
{
    [super sendEvent:event];
    
    NSSet *allTouches = [event allTouches];
    if (allTouches.count > 0) {
        UITouchPhase phase = ((UITouch *)[allTouches anyObject]).phase;
        if (phase == UITouchPhaseBegan) {
            NSLog(@"TouchPhaseBegan");
        }
    }
}