Question

您好我的应用程序尝试在我的Flickr中显示UICollectionView图像，但它显示了一个空的视图控件

我的代码显示Flickr图片。

{
   NSMutableArray *photoURLs;
   NSMutableArray *photoSetNames;
   NSMutableArray *photoids;
}

viewDidLoad代码。

- (void)viewDidLoad
{ 
[super viewDidLoad];   
photoURLs = [[NSMutableArray alloc] init];
photoSetNames = [[NSMutableArray alloc] init];
photoids = [[NSMutableArray alloc] init];
[self loadFlickrPhotos];
[self.collectionview reloadData];

 }

- (void)loadFlickrPhotos {

    NSString *urlString = [NSString stringWithFormat:@"https://www.flickr.com/services/rest/?method=flickr.photosets.getPhotos&format=json&api_key=a6a0c7d5efccffc285b0fe5ee1d938e3&photoset_id=72157644758906604&per_page=10&nojsoncallback=1",nil];

    NSLog(@"the url string==%@",urlString);
    NSURL *url = [NSURL URLWithString:urlString];

    NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];

    NSLog(@"the str==%@",jsonString);

    NSDictionary *results = [NSJSONSerialization JSONObjectWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];
    NSArray *photosets = [[results objectForKey:@"photosets"] objectForKey:@"photoset"];

    for (NSDictionary *photoset in photosets) {

        NSString *title = [[photoset objectForKey:@"title"] objectForKey:@"_content"];
        NSLog(@"title==%@",title);
        [photoSetNames addObject:(title.length > 0 ? title : @"Untitled")];

        NSString *primary = [photoset objectForKey:@"primary"];

        NSString *server = [photoset objectForKey:@"server"];

        NSString *secret = [photoset objectForKey:@"secret"];

        NSString *farm = [photoset objectForKey:@"farm"];

        NSString *urlstr=[NSString stringWithFormat:@"http://farm%@.staticflickr.com/%@/%@_%@.jpg",farm,server,primary,secret];

        NSLog(@"your photo id==%@",urlstr);

        [photoids addObject:urlstr];
    }
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [photoids count];
}

- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView {
    return 1;
}

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

    static NSString *cellIdentifier =@"Cell";

    imggpolitical *cell=(imggpolitical *) [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath: indexPath];


    cell.imageview.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",[photoids objectAtIndex:indexPath.row]]]]];

    return cell;
}

我已使用上述内容在Flickr中显示UICollectionView图像，但它是一个空视图，请告诉我如何解决此问题。

感谢。

Answer 1

尝试[self.collectionview reloadData]

Answer 2

在 - （void）loadFlickrPhotos方法结束时，在UICollectionView上调用reloadData。您需要告诉UICollectionView刷新其数据。

Answer 3

我没有看到您正在分配代理或数据源。或者就此而言，创建了您的UICollectionView。

UICollectionView显示为空

3 个答案: