手势和事件冲突的事件传递

···

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
  NSLog(@"touchesBegan");
  }

• (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  NSLog(@"touchesMoved");
  }

• (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
  NSLog(@"touchesCancelled");
  }

• (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
  NSLog(@"touchesEnded");
  }

• (void)viewDidLoad {
  [super viewDidLoad];
  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
  // tap.cancelsTouchesInView = NO;
  // tap.delaysTouchesBegan = YES;
  [self.view addGestureRecognizer:tap];

打印结果是啥
···