iOS事件传递及处理方法

iOS事件传递及处理方法。UIView继承与UIResponder，UIResponder提供四个处理方法（PS:不使用父类处理，【super之类的，会拦截事件）。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchBegan");
[super touchesBegan:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchMoved");
[super touchesMoved:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchEnded");
[super touchesEnded:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(@"touchCancelled");
[super touchesCancelled:touches withEvent:event];
}

 

UIView进行事件分发处理时，两个主要的方法

//此方法用于确定该事件是不是本View内部，也可以人工篡改不拦截事件。（一个view能处理事件的充分必要条件是以下两个都是yes，而且view.userInterfaceEnable = YES 才可以）

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
return YES;
}

//此方法用来确定本View的各个子View中，哪个处理event合适，如果没有合适的子view，就会返回本类

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
NSArray * views = self.subviews;
for (UIView * view in views) {
if ([view isKindOfClass:[ButtonC class]]) {
return view;
}
}
return nil;
}