iOS-实现超出父视图点击响应

关于这个问题，其实网上有很多技术博客给出了很好的方案，但是仍然有个别博客将有严重错误的结论挂在网上（例如），本文就该问题进行了严格的论证，希望能够帮到有需要的人。

错误结论：每次递归去调用hitTest:(CGPoint)point withEvent:(UIEvent *)event之前，都会调用pointInside:withEvent:来确定该触摸点是否在该View内。 正确结论：先调用hitTest:(CGPoint)point withEvent:(UIEvent *)event，而后调用pointInside:withEvent:。

那么点击超出父视图但在子视图的区域时，要想响应事件到底怎么处理最合理？ 正确答案：

重写父视图方法 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { UIView *view = [super hitTest:point withEvent:event]; if (self.userInteractionEnabled == NO && self.alpha <= 0.01 && self.hidden == YES) { return nil; } if (view == nil) { for (UIView * subview in self.subviews.reverseObjectEnumerator) { CGPoint converP = [subview convertPoint:point fromView:self]; UIView *suitableView = [subview hitTest:converP withEvent:event]; if (suitableView) { return suitableView; } else { return view; } } } return view; }

相关知识：Hit-test view的应用 扩大UIButton的点击区域

- (BOOL)pointInside:(CGPoint)point withEvent:(nullable UIEvent *)event { return CGRectContainsPoint(HitTestingBounds(self.bounds, self.minimumHitTestWidth, self.minimumHitTestHeight), point); } CGRect HitTestingBounds(CGRect bounds, CGFloat minimumHitTestWidth, CGFloat minimumHitTestHeight) { CGRect hitTestingBounds = bounds; if (minimumHitTestWidth > bounds.size.width) { hitTestingBounds.size.width = minimumHitTestWidth; hitTestingBounds.origin.x -= (hitTestingBounds.size.width - bounds.size.width)/2; } if (minimumHitTestHeight > bounds.size.height) { hitTestingBounds.size.height = minimumHitTestHeight; hitTestingBounds.origin.y -= (hitTestingBounds.size.height - bounds.size.height)/2; } return hitTestingBounds; }