UICollectionView不显示

Question

我试图从UICollectionView文件目录显示图像的任何图像，一切工作正常，但似乎没有图像

- (void)viewDidLoad 

{ 

    [super viewDidLoad]; 

    // Initialize recipe image array 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

    NSString *documentsDirectory = [paths objectAtIndex:0]; 



    NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:nil]; 


    NSMutableArray *image = [NSMutableArray array]; 


    for (NSString *tString in dirContents) { 

     if ([tString hasSuffix:@".png"]) { 

      [image addObject:tString]; 


      listeImages = [NSArray arrayWithArray:image]; 


     } 

    } 


} 


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ 

    return listeImages.count; 



} 


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ 

    static NSString *identifier = @"Cell"; 

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath]; 



    UIImageView *listeImageView = (UIImageView *)[cell viewWithTag:100]; 

    UILabel *LabelView = (UILabel *)[cell viewWithTag:110]; 

    LabelView.text = [listeImages objectAtIndex:indexPath.row]; 

    listeImageView.image = [UIImage imageNamed:[listeImages objectAtIndex:indexPath.row]]; 

    NSLog(@" List UIImageView listeImageView.image %@",listeImageView.image); 

cell.backgroundColor =的UIColor redColor]

cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]]; 



    NSLog(@" List NSArray *listeImages %@",listeImages); 

    cell.tag = indexPath.row; 

    return cell; 

} 

与此一段代码，显示正确的UICollectionView的UILabel良好，但不显示图像。

我使用这行代码将我的图像存储在listeImageView.image中。

UIImageView *listeImageView = (UIImageView *)[cell viewWithTag:100]; 
    listeImageView.image = [UIImage imageNamed:[listeImages objectAtIndex:indexPath.row]]; 

这里是我的NSLog的结果：

2014-10-11 09:46:31.117 imgapp[2803:60b] List NSArray *listeImages; (
    "image10102014233607.png", 
    "image10102014233616.png", 
    "image10102014233627.png" 
) 
2014-10-11 09:46:31.158 imgapp[2803:60b] List UIImageView listeImageView.image (null) 
2014-10-11 09:46:31.171 imgapp[2803:60b] List UIImageView listeImageView.image (null) 
2014-10-11 09:46:31.178 imgapp[2803:60b] List UIImageView listeImageView.image (null) 

任何帮助将不胜感激。

感谢

Answer 1

你不加入你的listeImageView任何东西。 与

[cell addSubview:listeImageView]; 

尝试它，或者如果你真的想成为backgroundView

cell.backgroundView = listeImageView; 

但它会是干净多了，如果你创建一个自定义UICollectionViewCell级，你可以定义哪些内容该细胞有。

Answer 2

您拥有以下，

listeImageView.image = [UIImage imageNamed:[listeImages objectAtIndex:indexPath.row]]; 

但你这样做，

cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"photo-frame.png"]]; 

为什么你不使用如下的listeImageView： -

cell.backgroundView = listeImageView; 

这应该让你的形象。

更新： -

for (NSString *tString in dirContents) { 

    if ([tString hasSuffix:@".png"]) { 

       **[image addObject:[UIImage imageWithContentsOfFile:tString] ]; //Do this as in below line you were not create a image object which you are trying to get.** 

     //Also check your image array for object, that is it getting stored or not. 
     //  [image addObject:tString]; 

    } 

} 

listeImages = [NSArray arrayWithArray:image]; //Do this after you have added all objects in your image mutable array and not in for loop as this will initialise it many tiems depending on your loop run count. 

Answer 3

具有u想给背景色而不是细胞backgroundview.do的，一旦如果有可能与你的相同的代码！你可以尝试像这样：-UIImageView * listeImageView =（UIImageView *）[cell viewWithTag：100]; [cell bringviewtoFront：listeImageView];

Answer 4

你可以在子类化UICollectionViewCell，并在故事板中设置子视图好多了。您的代码可能会更清洁这种方式：

static NSString *kCustomCellIdentifier = @"customcell"; 

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
    MYAPPCustomCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kCustomCellIdentifier forIndexPath:indexPath]; 

    // Load custom image 
    NSString *imageName = [listeImages objectAtIndex:indexPath.row]; 
    if (imageName) 
    { 
     UIImage *image = [UIImage imageNamed:imageName]; 
     if (image) 
     { 
      cell.customImageView.image = image; 
     } 
     else 
     { 
      // Set an empty state here 
      cell.customImageView.image = [UIImage imageNamed:@"errorImage.png"]; 
     } 
    } 

    return cell; 
}