iPad上的SDWebImage

Question

我正在创建一个图像库，点击图像可导航到下一个视图。我正在使用SDWebImage库来缓存图像。缓存工作得很好，我正在获取图像库。问题是，如果我清除缓存并运行我的应用程序。

图像被下载到委托方法中，但我无法在我的按钮（viewdidload中的dat）中分配下载的图像，第一次也没有发生缓存，并且图像只有在第二次运行我的iPad应用程序时才会显示（由于缓存）。我想要在清除缓存时下载并显示图像。我怎样才能做到这一点？

我甚至准备给整个源代码。

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    self.synced = [NSMutableArray array]; 
    self.title=@"boom"; 
    jsonurl=[NSURL URLWithString:@"http://www.1040communications.net/sheeba/stepheni/iphone/stephenFlickr.json"]; 
    jsonData=[[NSString alloc]initWithContentsOfURL:jsonurl]; 
    dict=[jsonData objectFromJSONString]; 
    items=[dict objectForKey:@"items"]; 
    story = [[NSMutableArray array]retain]; 
    media1= [[NSMutableArray array]retain]; 
    for (NSDictionary *item in items) 
    { 
     [story addObject:[item objectForKey:@"title"]]; 
     [media1 addObject:[item objectForKey:@"media"]]; 
    } 
    view1 = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    for(int i = 0; i < media1.count; i++) 
    { 
     NSString *mel=[media1 objectAtIndex:i]; 
     NSString *escapedURL = [mel stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; 
     NSURL *url1=[NSURL URLWithString:escapedURL]; 
     managaer=[SDWebImageManager sharedManager]; 

     cacheImage = [managaer imageWithURL:url1]; 

     //To clear the cache, uncomment these three lines 
     /* SDImageCache *imageCache = [SDImageCache sharedImageCache]; 
        [imageCache clearDisk]; 
        [imageCache clearDisk];*/ 
     if (cacheImage) { 
      //If a cache image is present 
     } 
     else 
     { //If there is no cache image present, download. 
      [managaer downloadWithURL:url1 delegate:self]; 
     } 
     button = [UIButton buttonWithType:UIButtonTypeCustom]; 
     button.frame = CGRectMake(column*260+1, row*280+300, 250, 250); 
     [button setImage:cacheImage forState:UIControlStateNormal]; 
     NSLog(@"cached image:%@",cacheImage); 

     [button addTarget:self action:@selector(buttonClicked:) 
       forControlEvents:UIControlEventTouchUpInside]; 
     button.tag = i; 

     [view1 addSubview:button]; 

     if (column == 2) { 
      column = 0; 
      row++; 
     } else { 
      column++; 
     } 
    } 

    [view1 setContentSize:CGSizeMake(600, (row+1) *280 + 10)]; 
    [self.view addSubview:view1]; 
    [view1 release]; 
} 

-(void)webImageManager:(SDWebImageManager *)imageManager didFinishWithImage: (UIImage *)image 
{ 
    //The image gets downloaded over here.. 
} 

Answer 1

您需要重新加载您的视图中-webImageManager:didFinishWithImage:。如果您删除了子视图并使用for(int i = 0; i < media1.count; i++)循环重新加载了方法中的所有内容，那么无需重新启动应用即可更新您的用户界面。