UIButton 作为复杂 UIScrollView 上的子视图

Question

在我的应用程序中，我实现了基于ARScrollViewEnhancer 的非常复杂的控制。我需要它来显示UIScrollView 的多个页面。所以这是我的UIScrollView 代码：

dateScroll = [[UIScrollView alloc] initWithFrame:CGRectMake(28, 0, dateLabelMaxSize, 45)];
dateScroll.pagingEnabled = YES;
dateScroll.clipsToBounds = NO;
dateScroll.showsHorizontalScrollIndicator = NO;
dateScroll.backgroundColor = [UIColor clearColor];
dateScroll.contentSize = CGSizeMake(dateLabelMaxSize*[dayArray count], 45);

我使用dateScroll.clipsToBounds = NO; 来显示超出框架的页面。这是ARScrollViewEnhancer的代码：

ARScrollViewEnhancer *backForDate = [[ARScrollViewEnhancer alloc] initWithFrame:CGRectMake(0, 80, self.view.frame.size.width, 45)];
[backForDate addSubview:dateScroll];
backForDate._scrollView = dateScroll;
[self.view addSubview:backForDate];

然后我为UIScrollView 添加了子视图。这是UILabels 和UIButtons。

for (int i=0;i<[dayArray count];i++){

    UILabel *dateLabel = [[UILabel alloc] initWithFrame:CGRectMake(3+dateLabelMaxSize*i, 5, dateLabelMaxSize, 40)];
    dateLabel.backgroundColor = [UIColor clearColor];
    dateLabel.textAlignment = UITextAlignmentLeft;
    dateLabel.text = @"some text...";
    [dateScroll addSubview:dateLabel];


    UIButton *dateButton = [UIButton buttonWithType:UIButtonTypeCustom];
    //dateButton.backgroundColor = [UIColor redColor];
    dateButton.frame = CGRectMake(3+dateLabelMaxSize*i, 5, dateLabelMaxSize-10, 40);
    dateButton.tag = i;
    [dateButton addTarget:self action:@selector(dateTapped:) forControlEvents:UIControlEventTouchUpInside];
    [dateScroll addSubview:dateButton];
} 

以及按钮的方法：

-(void)dateTapped:(UIButton*)button{
    NSLog(@"%i",button.tag);
}

所以，按钮不起作用（（为什么？ 谢谢。

UPD。

hitTest 方法代码。是：

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if ([self pointInside:point withEvent:event]) {
        return _scrollView;
    }
    return nil;
}

现在：

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *scrv = _scrollView;
    UIView *superView = [super hitTest:point withEvent:event];
    if (superView == self)
    {
        CGPoint scrollViewpoint = [_scrollView convertPoint:point fromView:self];

        for(UIView *view in _scrollView.subviews) {
            if(CGRectContainsPoint(view.frame, scrollViewpoint)) {
                return view;
            }
        }

        return scrv;
    }

    return superView;
}

Answer 1

如果您还在自定义控件中复制了 hitTest 方法，则会导致问题，因为它总是返回滚动视图而不是按钮。

您需要返回正确的子视图，而不是总是返回子视图，如下所示：

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {    
    UIView *scrv = self.scrollView;
    UIView *superView = [super hitTest:point withEvent:event];
    if (superView == self)
    {
        CGPoint scrollViewpoint = [self.scrollView convertPoint:point fromView:self];
        for(UIView *view in self.scrollView.subviews) {
            if(CGRectContainsPoint(view.frame, scrollViewpoint)) {
                return view;
            }
        }
        return scrv;
    }
    return superView;
}