objective-c - UIImageView 标签和点击手势问题

Question

我正在开发适用于 iPad 的 child 图书应用程序。它有一个加载 UIImageView 以显示 UIImages (JPEG's) 的 UIView，用户可以在图像上滑动以浏览页面——一切正常。现在我想通过添加另一个 UIImageView 来为一些页面添加一些交互性，它会加载一个 PNG 文件，并且在点击手势上我想为它们设置动画......下面是代码片段......

我在 viewDidLoad 中向 UIView 添加了一个点击手势。 viewDidLoad 调用 loadPage 并在 loadPage 内部我以编程方式添加一个包含 PNG 文件的 UIImageView (imageAnimation) 并为其分配一个标签，以便我可以根据 handleTap 例程中的标签播放动画。出于某种原因，handleTap 中的 switch 语句仅针对情况 1 执行，对于其他情况，永远不会调用 handleTap 例程。我做错了什么？

#import "KidsViewController.h"

@implementation KidsViewController
@synthesize imageAnimation;

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([touch.view isKindOfClass:[UISlider class]] || [touch.view isKindOfClass:[UIButton class]])
    {
        return NO;
    }
    return YES;
}

- (void)handleTap:(UITapGestureRecognizer *)recognizer {

    NSLog(@"KidsViewController ==> handleTap.");

    switch (((UIGestureRecognizer *)recognizer).view.tag)      
    {
        case 1:
            //...
            NSLog(@"KidsViewController ==> handleTap. Switch Case: %d", 1);
            break;
        case 2:
            //...
            NSLog(@"KidsViewController ==> handleTap. Switch Case: %d", 2);
            break;
        case 3:
            //...
            NSLog(@"KidsViewController ==> handleTap. Switch Case: %d", 3);
            break;            
        default:
            NSLog(@"KidsViewController ==> handleTap. Switch Case: DEFAULT");
            break;
    }

}

- (void)viewDidLoad {

    pageCount=12;
    pageNum=1;

    //put imageviews in place
    imageNext.frame=CGRectMake(0,0-crop,screenwidth,screenheight+(crop*2));
    imageCurrent.frame=CGRectMake(0,0-crop,screenwidth,screenheight+(crop*2));

    [self loadPage];

    imageCurrent.image = [UIImage imageWithContentsOfFile:[self filePathForLanguage:language pageNumber:pageNum fileType:@"jpg"]];

    //TAP GESTURE
    UITapGestureRecognizer *tapRecognizer;
    tapRecognizer=[[UITapGestureRecognizer alloc] 
                   initWithTarget:self
                   action:@selector(handleTap:)];
    tapRecognizer.numberOfTapsRequired=1;
    tapRecognizer.numberOfTouchesRequired=1;
    [self.imageAnimation addGestureRecognizer:tapRecognizer];
    tapRecognizer.delegate = self;
    [tapRecognizer release];
}

-(void)loadPage{

    imageNext.image = [UIImage imageWithContentsOfFile:[self filePathForLanguage:language pageNumber:pageNum fileType:@"jpg"]]; //[UIImage imageWithContentsOfFile:pathFilename];

    switch (pageNum)      
    {
        case 1:
            //...
            NSLog(@"KidsViewController ==> loadPage. Switch Case: %d", pageNum);
            UIImage *image = [UIImage imageNamed:@"P3-stilts_00000.png"];
            CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);
            imageAnimation = [[UIImageView alloc] initWithFrame:frame];
            imageAnimation.userInteractionEnabled = YES;
            imageAnimation.image = image;
            imageAnimation.tag = pageNum;
            [self.view addSubview:imageAnimation];
            [image release];
            break;
        case 2:
            //...
            NSLog(@"KidsViewController ==> loadPage. Switch Case: %d", pageNum);
            imageAnimation.image = nil;
            [imageAnimation setCenter:CGPointMake(-100,-100)];
            break;
        case 3:
            //...
            NSLog(@"KidsViewController ==> loadPage. Switch Case: %d", pageNum);
            UIImage *image3 = [UIImage imageNamed:@"bug.png"];
            CGRect bugFrame = CGRectMake(0, 0, image3.size.width, image3.size.height);
            imageAnimation = [[UIImageView alloc] initWithFrame:bugFrame];
            imageAnimation.userInteractionEnabled = YES;
            imageAnimation.image = image3;
            imageAnimation.tag = pageNum;
            [self.view addSubview:imageAnimation];
            [image3 release];
            break;            
        default:
            NSLog(@"KidsViewController ==> loadPage. Switch Case: DEFAULT");
            [imageAnimation setCenter:CGPointMake(-100,-100)];
            break;
    }
}

- (void)dealloc {
    [setupViewController release];
    [imageCurrent release];
    [imageNext release];
    [imageShadow release];
    [imageMenuBar release];
    [imageAnimation release];
    [super dealloc];
}

@end

Answer 1

你总能得到你的self.view标签。它的标签默认为0。所以 switch 跳转到默认选项。

您可以将您的识别器添加到 imageAnimation，它会正常工作。