hitTest断当前控件能否接收事件

(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{

// 1.判断当前控件能否接收事件
if (self.userInteractionEnabled == NO || self.hidden == YES || self.alpha <= 0.01) return nil;

// 2. 判断点在不在当前控件
if ([self pointInside:point withEvent:event] == NO) return nil;

// 3.从后往前遍历自己的子控件
NSInteger count = self.subviews.count;

for (NSInteger i = count - 1; i >= 0; i--) {
UIView *childView = self.subviews[i];

  // 把当前控件上的坐标系转换成子控件上的坐标系
  CGPoint childP = [self convertPoint:point toView:childView];
  
  UIView *fitView = [childView hitTest:childP withEvent:event];
  
  
  if (fitView) { // 寻找到最合适的view
      return fitView;
  }

}
// 循环结束,表示没有比自己更合适的view
return self;
}