未检测到图像视图上的点击

Question

我有一个应用程序，我在图像视图中从 URL 调用图像。图像视图添加为滚动视图的子视图。在我的实现文件中，我使用了此代码

    - (void)loadView {
    [super loadView];


        // add gesture recognizers to the image view
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)];

    [doubleTap setNumberOfTapsRequired:2];
    [twoFingerTap setNumberOfTouchesRequired:2];


    NSURL *imgUrl=[[NSURL alloc] initWithString:@"http://www.deviantart.com/download/80153093/Sexy_Kabuto_by_dark_tarou.jpg"];                 
    NSData *imgData = [NSData dataWithContentsOfURL:imgUrl];
    UIImage *img = [UIImage imageWithData:imgData];
    imageView = [[UIImageView alloc] initWithImage:img];



    // set the tag for the image view
    [imageView setTag:ZOOM_VIEW_TAG];



    [imageView addGestureRecognizer:singleTap];
    [imageView addGestureRecognizer:doubleTap];
    [imageView addGestureRecognizer:twoFingerTap];

    [singleTap release];
    [doubleTap release];
    [twoFingerTap release];

    [self.imageScrollView addSubview:imageView];
    [imgUrl release]; 

    // calculate minimum scale to perfectly fit image width, and begin at that scale
    float minimumScale = [imageScrollView frame].size.width  / [imageView frame].size.width;
    [imageScrollView setMinimumZoomScale:minimumScale];
    [imageScrollView setZoomScale:minimumScale];
    NSLog(@"%d",imageView.tag);
}

当我在模拟器上运行时，它没有检测到点击识别器。在控制台窗口中显示此消息

2011-08-01 10:01:46.999 ImageScroll[443:1907] * __NSAutoreleaseNoPool(): UIView 类的对象 0x4e412d0 自动释放，没有池 - 只是泄漏 无法访问变量“doubleTap” ” 无法访问变量“singleTap” 无法访问变量“doubleTap” 无法访问变量“doubleTap”

这段代码中有什么错误，以至于它显示这种类型的消息。

Answer 1

您检查过“UserInteractionEnabled”吗？我相信默认情况下是“否”。 （在UIView中默认值为YES）

Answer 2

尝试自动释放而不是像这样立即释放：

//EDIT:1
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
UITapGestureRecognizer *singleTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)] autorelease];
UITapGestureRecognizer *doubleTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)] autorelease];
UITapGestureRecognizer *twoFingerTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerTap:)] autorelease];
//EDIT:2
[pool release];

然后注释掉这些行

[singleTap release];
[doubleTap release];
[twoFingerTap release];

希望这会有所帮助。

Answer 3

试试这个

    [self.view addGestureRecognizer:singleTap];
    [self.view addGestureRecognizer:doubleTap];
    [self.view addGestureRecognizer:twoFingerTap];