Question

由于某种原因，我在viewController的addBook方法中初始化的按钮不会响应触摸。我分配给它的选择器永远不会触发，点击图像时也不会出现UIControlStateHighlighted图像。

在他们到达UIButton之前是否有一些拦截的东西，或者它的互动因某种程度上被我正在做的事情所禁用？

- (void)viewDidLoad {

    ...

    _scrollView.contentSize = CGSizeMake(currentPageSize.width, currentPageSize.height);
    _scrollView.showsHorizontalScrollIndicator = NO;
    _scrollView.showsVerticalScrollIndicator = NO;
    _scrollView.scrollsToTop = NO;
    _scrollView.pagingEnabled = YES;

    ...
}

- (void)addBook {
    // Make a view to anchor the UIButton
    CGRect frame = CGRectMake(0, 0, currentPageSize.width, currentPageSize.height);
    UIImageView* bookView = [[UIImageView alloc] initWithFrame:frame];

    // Make the button
    frame = CGRectMake(100, 50, 184, 157);
    UIButton* button = [[UIButton alloc] initWithFrame:frame];
    UIImage* bookImage = [UIImage imageNamed:kBookImage0];

    // THIS SECTION NOT WORKING!
    [button setBackgroundImage:bookImage forState:UIControlStateNormal];
    UIImage* bookHighlight = [UIImage imageNamed:kBookImage1];
    [button setBackgroundImage:bookHighlight forState:UIControlStateHighlighted];
    [button addTarget:self action:@selector(removeBook) forControlEvents:UIControlEventTouchUpInside];

    [bookView addSubview:button];   
    [button release];
    [bookView autorelease];

    // Add the new view/button combo to the scrollview.
    // THIS WORKS VISUALLY, BUT THE BUTTON IS UNRESPONSIVE :(
    [_scrollView addSubview:bookView];
}

- (void)removeBook {
    NSLog(@"in removeBook");
}

视图层次结构在Interface Builder中如下所示：

UIWindow
UINavigationController
    RootViewController
        UIView
            UIScrollView
            UIPageControl

并且一旦addBook方法运行，可能就像这样：

UIWindow
UINavigationController
    RootViewController
        UIView
            UIScrollView
                UIView
                    UIButton
            UIPageControl

Answer 1

UIScrollView可能会抓住所有触摸事件。

也许尝试以下各项的组合：

_scrollView.delaysContentTouches = NO;
_scrollView.canCancelContentTouches = NO;

和

bookView.userInteractionEnabled = YES;

Answer 2

尝试删除 [bookView autorelease]; 并按照以下方式执行操作：

// Add the new view/button combo to the scrollview.
// THIS WORKS VISUALLY, BUT THE BUTTON IS UNRESPONSIVE :(
[_scrollView addSubview:bookView];
[bookView release];

_scrollView.canCancelContentTouches = YES;应该做的伎俩

delaysContentTouches - 是一个布尔值，用于确定滚动视图是否延迟了触摸式手势的处理。如果此属性的值为YES，则滚动视图会延迟处理触摸手势，直到它可以确定滚动是否为意图。如果值为NO，则滚动视图立即调用touchesShouldBegin：withEvent：inContentView：。默认值为YES。

canCancelContentTouches - 是一个布尔值，用于控制内容视图中的触摸是否始终导致跟踪。如果此属性的值为YES并且内容中的视图已开始跟踪触摸它的手指，并且如果用户拖动手指足以启动滚动，则视图将接收touchesCancelled：withEvent：消息并且滚动视图处理触摸滚动。如果此属性的值为NO，则在内容视图开始跟踪时，无论手指移动，滚动视图都不会滚动。

iPhone：向scrollview添加按钮使按钮无法进行交互

2 个答案: