Question

我正在使用ALAssetsLibrary来保存从在线服务器下载的图像。每个图像都是具有图像细节的imageObject。它将保存到相册（保存和检索网址，并将网址转换为图像的UUID）。将UUID添加到imageObject后，imageObject将添加到REALM数据库。

问题是没有执行保存到相册的代码。它被忽略了。我希望我的问题很清楚，我该怎么做才能使我的代码（块）可执行？

[self writeImagesSuccessively:[[NSMutableArray alloc] initWithArray:tempOSArray] completion:^(id result) {
    NSString *res = (NSString *)result;
    if ([res isEqualToString:@"finished"]) {
        //Add to realm
    } else {
        NSLog(@"Unable to finish writing images");
    }
}];

上面的代码将调用此方法，该方法将调用addImageToAssetLibrary将照片保存到相册并为每个单独的图像返回唯一的UUID。

- (void) writeImagesSuccessively:(NSMutableArray*)imgArr completion:(void(^)(id result))completionHandler {
if ([imgArr count] == 0) {
    if (completionHandler) {
        // Signal completion of writing all images in imgArr
        completionHandler(@"finished");
    }
    return;
}

ImageObject* imgObj = [imgArr firstObject];
[imgArr removeObjectAtIndex:0];
__block __typeof__(self) _self = self;

[self addImageToAssetLibrary:imgObj completion:^(BOOL success, NSString *response) {
    if (success) {
        imgObj.imageName = response;
        NSLog(@"***SAVED IMAGE: %@, %@, %lu", imgObj.imageName, response, (unsigned long)[imgArr count]);
    } else {
        NSLog(@"Could not save %@", imgObj.imageName);
    }
    [_self writeImagesSuccessively:imgArr completion:completionHandler];
}];

}

此方法将imgObj数组中的ImageObject添加到相册并返回UUID。但是，// 1) Create Album [self.library addAssetsGroupAlbumWithName:albumName resultBlock:^(ALAssetsGroup *group) { NSLog(@"added album:%@", albumName); }未被执行。

- (void) addImageToAssetLibrary:(ImageObject *)imgObj completion:(void(^)
(BOOL success,      NSString* response))completion
{
NSData *imgData = UIImageJPEGRepresentation(imgObj.image, 0.5);

NSString *albumName = @"AlgoAccess Photo Album";

// What is __block?
// Distinct storage type, where modifications to the var done inside the block are also visible outside of it
__block __typeof__(self) _self = self;
__block ALAssetsGroup* groupToAddTo;
__block ALAssetsLibrary* library;

// 1) Create Album **NOT EXECUTED
[self.library addAssetsGroupAlbumWithName:albumName resultBlock:^(ALAssetsGroup *group) {
    NSLog(@"added album:%@", albumName);
  }
} //**NEXT LINE OF EXECUTION IS HERE

编辑：1可疑，我的块没有被调用，而其他一些块被调用。 Any1可以建议我如何调试这些原因？

Xcode IOS7 ALAssetsLibrary代码未执行

0 个答案: