iOS 子控件超出父控件如何触发事件

重写父控件中的方法:(两个方法任选其一:)

    - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
    - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event;

具体实现:

  1. 方法一:
    //返回需要响应事件的view位置
    - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *view = [super hitTest:point withEvent:event];
    if (view == nil) {
    //转换坐标系
    CGPoint newPoint = [self.thirdBtn convertPoint:point fromView:self];
    //判断触摸点是否在button上
    if (CGRectContainsPoint(self.thirdBtn.bounds, newPoint)) {
    view = self.thirdBtn;
    }
    //NSLog(@"point:%@ : newPoint:%@",NSStringFromCGPoint(point),NSStringFromCGPoint(newPoint));
    }
    return view;
    }
  2. 方法二:
    //当point在父控件和子控件包含的区域时,应该返回YES,否则为NO;
    - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    NSLog(@"point:%@",NSStringFromCGPoint(point));
    if (!CGRectContainsPoint(self.bounds, point)) {
    //转换坐标系
    CGPoint newPoint = [self convertPoint:point toView:self.secondBtn];
    //NSLog(@"newPoit:%@",NSStringFromCGPoint(newPoint));
    //判断触摸点是否在secondBtn上
    if (CGRectContainsPoint(self.secondBtn.bounds, newPoint)) {
    return YES;
    }
    return NO;
    }
    return YES;
    }

难点:

  1. 判断一个点是否在某个范围内
  • CGRectContainsPoint(Rect, Point); //判断Rect中是否包含Point
  • CGRectContainsRect(Rect1,Rect2);//判断Rect1中是否包含Rect2
  1. 实现对控制点坐标系的转换
    `view1:视图一` `view2:视图二` 
    `point:view1坐标系中的点` `newPoint:新得到view2坐标系中的点`
    //将point从view1的坐标系中转换到view2的坐标系中得到newPoint
    CGPoint newPoint = [view2 convertPoint:point fromView:view1];
    CGPoint newPoint = [view1 convertPoint:point toView:view2];
    类似方法:
    - (CGRect)convertRect:(CGRect)rect toView:(nullable UIView *)view;
    - (CGRect)convertRect:(CGRect)rect fromView:(nullable UIView *)view;

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