objective-c - 无法一张一张地显示UIImage

Question

从今天早上开始，我就有点卡住了……我试图在一张图片后加载另一张图片，但是……它不起作用……我什至没有显示我的第一张图片……

这是我的代码:

- (void) checkResources
{

    NSString *bundleRoot = [[NSBundle mainBundle] bundlePath];
    NSFileManager *manager = [NSFileManager defaultManager];
    NSDirectoryEnumerator *direnum = [manager enumeratorAtPath:bundleRoot];


    NSString *cuttedName;
    NSString *cuttedName1;



  for (NSString *path in direnum)
    {

        if ([[path pathExtension] isEqualToString:@"mp4"])
        {
            cuttedName1 = [path stringByReplacingOccurrencesOfString:@"ressources/" withString:@""];
            cuttedName = [cuttedName1 stringByReplacingOccurrencesOfString:@".mp4" withString:@""];
            if ([cuttedName isEqualToString:[NSString stringWithFormat:@"%d", num]]) 
            {
                NSString *media = [NSString stringWithFormat:@"%@/%@", bundleRoot, path];
                [self startSlideShow:media];
            }
        }
        else if ([[path pathExtension] isEqualToString:@"mov"])
        {
            cuttedName1 = [path stringByReplacingOccurrencesOfString:@"ressources/" withString:@""];
            cuttedName = [cuttedName1 stringByReplacingOccurrencesOfString:@".mov" withString:@""];
            if ([cuttedName isEqualToString:[NSString stringWithFormat:@"%d", num]]) 
            {
                NSString *media = [NSString stringWithFormat:@"%@/%@", bundleRoot, path];
                [self startSlideShow:media];
            }
        }
        else  if ([[path pathExtension] isEqualToString:@"png"])
        {
            cuttedName1 = [path stringByReplacingOccurrencesOfString:@"ressources/" withString:@""];
            cuttedName = [cuttedName1 stringByReplacingOccurrencesOfString:@".png" withString:@""];
            if ([cuttedName isEqualToString:[NSString stringWithFormat:@"%d", num]]) 
            {
                NSString *media = [NSString stringWithFormat:@"%@/%@", bundleRoot, path];
                num++;
            [self startImage:media];
            }
        }
    }

}
- (void) startImage:(NSString *)nameFile
{
    CGRect myImageRect = CGRectMake(0, 0, 200, 500);

    UIImageView *imageView;
    imageView = [[UIImageView alloc] initWithFrame:myImageRect];
    [imageView setImage:[UIImage imageNamed:@"0.png"]];
    NSLog(@"IAMGE %@", imageView.image);
    [self.view addSubview:imageView];
    [self performSelector:@selector(checkResources) withObject:nil afterDelay:10]; // this will give time for UI to update itself.. 
    [imageView release];

    }

- (void) startSlideShow:(NSString *)nameFile
{    
    NSURL *url = [NSURL fileURLWithPath:nameFile];//[[NSBundle mainBundle] pathForResource:@"2" ofType:@"mov"]];




    MPMoviePlayerController *moviePlayer = 
    [[MPMoviePlayerController alloc] initWithContentURL:url];
   // NSLog(@" URL : %@", url);

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlayBackDidFinish:)
                                                 name:MPMoviePlayerPlaybackDidFinishNotification
                                               object:moviePlayer];
    moviePlayer.view.frame = CGRectMake(0, 0, 500, 600);

    moviePlayer.controlStyle = MPMovieControlStyleDefault;
    moviePlayer.shouldAutoplay = YES;
    [self.view addSubview:moviePlayer.view];
    [moviePlayer setFullscreen:YES animated:YES];
   }



-(void)moviePlayBackDidFinish: (NSNotification*)notification
{ 
    MPMoviePlayerController *moviePlayer = [notification object];

    [[NSNotificationCenter defaultCenter] removeObserver:self      
                                                    name:MPMoviePlayerPlaybackDidFinishNotification
                                                  object:moviePlayer];

    if ([moviePlayer respondsToSelector:@selector(setFullscreen:animated:)])
    {
       // [moviePlayer.view removeFromSuperview];
    }


    //[[moviePlayer release] addAnimation:animation forKey:kCATransition];


    num++;
    [self checkResources];
}

不要介意我的代码的目标 :) 我只想显示 uiimage，然后在显示第一张图像后调用方法 checkResources 时，我将向 startImage 发送另一张图像。

Answer 1

您的代码中可能存在两个主要问题……没有其他问题。

1) 由于连续的 addSubview 方法，您的 UI 没有更新..

2) 你的 UIImage 是空的..

检查1)

改变

[self checkResources];

到

[self performselector:@selector(checkResources) withObject:nil afterDelay:3] // this will give time for UI to update itself.. 

对上面的代码使用自动完成...可能是拼写错误..

检查2)

简单地 NSlog imageview.image .. 这将判断 ImageView 图像是否为空..