代码:

- (NSMutableArray *)getAllPhoto{    NSMutableArray *arr = [NSMutableArray array];        // 所有智能相册    PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];    for (NSInteger i = 0; i < smartAlbums.count; i++) {        PHCollection *collection = smartAlbums[i];        //遍历获取相册        if ([collection isKindOfClass:[PHAssetCollection class]]) {            PHAssetCollection *assetCollection = (PHAssetCollection *)collection;            PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];            PHAsset *asset = nil;            if (fetchResult.count != 0) {                for (NSInteger j = 0; j < fetchResult.count; j++) {                    //从相册中取出照片                    asset = fetchResult[j];                    PHImageRequestOptions *opt = [[PHImageRequestOptions alloc]init];                    opt.synchronous = YES;                    PHImageManager *imageManager = [[PHImageManager alloc] init];                    [imageManager requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFill options:opt resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {                        if (result) {                            [arr addObject:result];                        }                    }];        }            }    }        }        //返回所有照片    return arr;

由于此方法为同步方法 所以需要放在子线程中去执行 例如:

dispatch_async(dispatch_get_global_queue(0, 0), ^{        NSMutableArray *arr = [self getAllPhoto];        NSLog(@"完成%@ \n照片总数%ld", arr, arr.count);    });​