iOS点击响应的控制

第一种：一个view的子控件部分在view的范围外，要点击响应范围外的这部分要用到：

/**
 close按钮是添加在view里面，但是有一部分超出了绿色view的范围。默认情况下点击view区域外的按钮部分，close按钮是不会有任何响应的。接下来我通过重写- (nullable UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event方法来让点击close按钮任何一个地方都能响应
 */
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if (self.userInteractionEnabled == NO || self.isHidden || self.alpha <= 0.01) {
        //这三种情况不能响应事件
        return nil;
    }
    
    //往前遍历子控件
    for (NSInteger i = self.subviews.count - 1; i >= 0; i--) {
        UIView *subView = self.subviews[i];
        //把点的坐标转换成子控件的坐标
        CGPoint newPoint = [self convertPoint:point toView:subView];
        if ([subView hitTest:newPoint withEvent:event]) {
            //找到最合适的view
            return subView;
        }
    }
    return [super hitTest:point withEvent:event];
}

第二种：一个view点击的时候要响应自己还是哪个子控件的时候，要用到：

//判断一个点是否在某个范围内
-(BOOL)point:(CGPoint)point IsInFrame:(CGRect)frame{
    
    CGMutablePathRef pathRef=CGPathCreateMutable();
    CGPathMoveToPoint(pathRef, NULL, frame.origin.x, frame.origin.y);
    CGPathAddLineToPoint(pathRef, NULL, frame.origin.x, frame.origin.y + frame.size.height);
    CGPathAddLineToPoint(pathRef, NULL, frame.origin.x + frame.size.width, frame.origin.y + frame.size.height);
    CGPathAddLineToPoint(pathRef, NULL, frame.origin.x + frame.size.width, frame.origin.y);
    CGPathAddLineToPoint(pathRef, NULL, frame.origin.x, frame.origin.y);
    CGPathCloseSubpath(pathRef);
    
    if (CGPathContainsPoint(pathRef, NULL, point, NO))
    {
        DLog(@"point in path!");
        return YES;
    }

    DLog(@"outPoint out path!");
    return NO;
}

/**
  让点击响应那个按钮
 */
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    
    BOOL isLikePoint = [self point:point IsInFrame:self.like.frame];
    if (isLikePoint) {
        return self.like;
    }
    
    BOOL isAvtorPoint = [self point:point IsInFrame:self.avatorView.frame];
    if (isAvtorPoint) {
        return self.avatorView;
    }
    
    BOOL isCommentPoint = [self point:point IsInFrame:self.comment.frame];
    if (isCommentPoint) {
        return self.comment;
    }
    
    return [super hitTest:point withEvent:event];
}