Question

我有一个基于UIScrollView的自定义课程SlideShow。这是一个水平滚动幻灯片，包含可变数量的Slide视图（源自UIImageView）。我在IB中的SlideShow对象上启用了分页，滚动和用户交互。

我按照以下方式制作幻灯片：

@implementation SlideShow
...
// slides contains the pre-built Slide objects
// The alpha and zulu stuff is for faking infinite scroll, when the user gets to an edge.
- (void) configureSlides: (NSArray*) slides
{
    CGSize scrollSize = CGSizeMake(0.0, 0.0);
    self.zuluResetMarker = 0.0;

    Slide* alphaSlide = [slides[0] copy];
    Slide* zuluSlide = [slides[slides.count - 1] copy];

    scrollSize = [self insertSlide: zuluSlide size: scrollSize];
    self.alphaSlideOffset = scrollSize.width;
    for (Slide* s in slides)
    {
        scrollSize = [self insertSlide: s size: scrollSize];
    }

    self.alphaResetMarker = scrollSize.width;
    self.zuluSlideOffset = scrollSize.width - zuluSlide.frame.size.width;
    scrollSize = [self insertSlide: alphaSlide size: scrollSize];
    self.contentSize = scrollSize;

    [self setContentOffset: CGPointMake(self.alphaSlideOffset, 0.0) animated: NO];
}

- (CGSize) insertSlide: (Slide*) slide size: (CGSize) aggregateSize
{
    [slide setOriginX: aggregateSize.width originY: 0.0];
    CGSize s = slide.frame.size;
    aggregateSize.height = s.height > aggregateSize.height ? s.height : aggregateSize.height;
    aggregateSize.width += s.width;
    [self addSubview: slide];
    return aggregateSize;
}

当我初始化时，我为幻灯片设置UIGestureRecognizer以识别点按：

@implementation Slide
...
- (id) initWithImage: (UIImage*) image delegate: (id<SlideDelegate>) delegate
{
    if (self = [super initWithImage: image])
    {
        self.delegate = delegate;
        [self initialize];
    }

    return self;
}

- (void) initialize
{
    [self addGestureRecognizer: [[UITapGestureRecognizer alloc]
                                initWithTarget: self.delegate
                                        action: @selector(slideTapped:)]];
}

我验证了通过设置断点来调用initialize方法。但slideTapped:选择器没有。我将touchesBegan:withEvent:添加到Slide和SlideShow类，并NSLog()次调用。 SlideShow对象获取调用，但Slide对象永远不会。 Slide对象是SlideShow的子视图，因此，根据我阅读Apple的响应者链文档的方式，我期望Slide首先获得触摸。

是否还需要其他东西才能让子视图能够响应触摸事件？

Answer 1

问题是UIImageView实例默认用户与NO的交互。在init方法中添加以下行：self.userInteractionEnabled = YES;

在你的情况下：

- (void) initialize
{
    self.userInteractionEnabled = YES;
    [self addGestureRecognizer: [[UITapGestureRecognizer alloc]
                            initWithTarget: self
                                    action: @selector(slideTapped:)]];
}

自定义UIScrollView的子视图没有获得点击事件

1 个答案: