ios - 尽管图像远程存在于服务器上，但 SDWebImage 不显示图像

Question

我正在开发一个 iOS 应用程序，我正在使用 SDWebImage 作为图像下载器 API。

我正在使用 UICollectionView 并在方法中执行此操作

- (UICollectionViewCell *)collectionView:(SMToplinksCollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

有些图片已下载，有些未下载。没有下载的显示错误信息:

2014-06-15 12:11:50.203 c_shadow_ios_iphone[6867:60b] ===Error:Error Domain=NSURLErrorDomain Code=-1100 "The operation couldn’t be completed. (NSURLErrorDomain error -1100.)"

错误 -1100:NSURLErrorFileDoesNotExist

此外，UIImage 似乎为零。

我已经检查了 SDWebImage 尝试下载的 URL，它正确地为我提供了图像，所以错误似乎不合理

这是我使用的方法代码:

- (UICollectionViewCell *)collectionView:(SMToplinksCollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{    
SMToplinkCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:TopLinksCollectionViewID forIndexPath:indexPath];

NSArray *collectionViewArray = [self getToplinksArrayAccordingToTheIndex:collectionView.index];

//  CONFIGURE THE CELL
SMTopLinksObject *dataObject = collectionViewArray[indexPath.item];

//  1. Set the toplink title
cell.title     = dataObject.name;

//  2. Get the default image and blur it
cell.imageName = dataObject.localImageName;

//  3. Activate the preloader that shows the loading status

//  4. Load the image from the server
SDWebImageManager *manager = [SDWebImageManager sharedManager];
NSString *toplinksGetRequest = dataObject.prepareToplinksGetRequest;
NSURL *toplinksURL = [NSURL URLWithString:toplinksGetRequest];

NSLog(@"=== Trying to download image from URL:%@", toplinksGetRequest);
[manager downloadWithURL:toplinksURL
                 options:0
                progress:^(NSInteger receivedSize, NSInteger expectedSize){
                    //progression tracking code                        
                } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished){
                    if(finished)
                    {
                        NSLog(@"===image finished loading, image:%@", image);
                        NSLog(@"===Error:%@", error);
                    }
                    if (image)
                    { cell.shadowPageImageView.image = image; }
}];    
NSLog(@"=========Cell:%@", cell);
return cell;
}

输出

image is NIL

Error: Error Domain=NSURLErrorDomain Code=-1100 "The operation couldn’t be completed. (NSURLErrorDomain error -1100.)"

我在这里错过了什么？

Answer 1

[cell.diviceIV sd_setImageWithURL:[NSURL URLWithString:imgStringUrl] placeholderImage:nil options:SDWebImageRetryFailed completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
    if (image){
        // Set your image over here
       }else{
           //something went wrong
       }

}];

要点是您需要在方法中提供的 options:SDWebImageRetryFailed 选项。它对我有用，您可以尝试一下。