因为QBImagePickerController使用的ALAssetsLibrary方式来读取图片，如果采用默认方式去执行，那么根据url读取到的asset会为空，这时候我们就 需要特殊处理
1 [self.assetsLibrary assetForURL:selectedAssetURL
2 resultBlock:^(ALAsset *asset) {
3 // Add asset
4
5 //普通照片方式
6 if (asset) {
7 [assets addObject:asset];
8 // Check if the loading finished
9 if (assets.count == weakSelf.selectedAssetURLs.count) {
10 // Delegate
11 if (self.delegate && [self.delegate respondsToSelector:@selector(imagePickerController:didSelectAssets:)]) {
12 [self.delegate imagePickerController:self didSelectAssets:[assets copy]];
13 }
14 }
15 }
16 //照片流方式
17 else{
18 //照片流的处理方法
19 [self.assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupPhotoStream usingBlock:^(ALAssetsGroup *group, BOOL *stop)
20 {
21 [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
22
23 if ([result.defaultRepresentation.url isEqual:selectedAssetURL]) {
24 [assets addObject:result];
25 *stop = YES;
26 // Check if the loading finished
27 if (assets.count == weakSelf.selectedAssetURLs.count) {
28 // Delegate
29 if (self.delegate && [self.delegate respondsToSelector:@selector(imagePickerController:didSelectAssets:)]) {
30 [self.delegate imagePickerController:self didSelectAssets:[assets copy]];
31 }
32 }
33 }
34 }];
35 } failureBlock:^(NSError *error) {
36 DDLogVerbose(@"Cann't found asset from stream:%@",[error localizedDescription]);
37 }];
38
39 }
40 } failureBlock:^(NSError *error) {
41 NSLog(@"Error: %@", [error localizedDescription]);
42 }];