iOS判断当前点击的位置是否在某个视图上
记录几种判断触摸点是否在某个view上面的方法
第一种方式：isDescendantOfView:
通过touch.view调用 isDescendantOfView:方法，返回 YES, 则触摸点在我们需要判断的视图上；反之则不在。
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches.allObjects lastObject];
BOOL result = [touch.view isDescendantOfView:self.blueView];
NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
}
第二种方式：locationInView:和 containsPoint 结合使用
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches.allObjects lastObject];
CGPoint point = [touch locationInView:self.blueView];
BOOL result = [self.blueView.layer containsPoint:point];
NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
}
第三种方式：locationInView:和 CGRectContainsPoint 结合使用
locationView 如果传入的是需要判断视图(self.blueView)的父视图，CGRectContainsPoint则需要传入需要判断视图(self.blueView)的frame，否则传入 bounds，（即判断的是子视图，传入子视图的.bounds）。
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches.allObjects lastObject];
CGPoint point = [touch locationInView:self.blueView];
BOOL result = CGRectContainsPoint(self.blueView.bounds, point);
NSLog(@"这次%@点击在蓝色视图上", result ? @"是" : @"不是");
}
第四种方式：坐标转换convertPoint:fromLayer: 再判断是否是在该视图范围内 containsPoint:
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
CGPoint point = [[touches anyObject] locationInView:self.view];
point = [self.blueView.layer convertPoint:point fromLayer:self.view.layer];
BOOL result = [self.blueView.layer containsPoint:point];
NSLog(@"%@点击在蓝色视图上", result ? @"是" : @"不是");
}
