ios - UICollectionView 不显示任何图像

Question

我试图在 UICollectionView 中显示文档目录中的图像，一切正常，但没有图像出现

- (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 = [UIColor redColor];

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



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

    cell.tag = indexPath.row;

    return cell;

}

通过这段代码，可以很好地显示正确的 UICollectionView UILabel，但没有显示图像。

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)

我们将不胜感激。

谢谢

Answer 1

您有以下内容，

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

但你的所作所为，

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

为什么你不使用你的 listeImageView 如下:-

cell.backgroundView = listeImageView;

这应该让你得到图像。

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.