objective-c - requestAVAssetForVideo 不显示完成 block

Question

我有这段代码来加载 PHAsset:

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.networkAccessAllowed = YES;

[[PHImageManager defaultManager] requestAVAssetForVideo:[videos objectAtIndex:index]  options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
    selectedAsset = asset;
}];

它可以完美处理设备上存储的视频。但是如果代码应该从 iCloud 加载视频，它不会调用完成 block 。你能帮帮我吗？

Answer 1

请尝试附加代码 1 到 3

PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.networkAccessAllowed = YES;

//Additional code 1
dispatch_semaphore_t semaphore = dispatch_semaphore_create(1);

[[PHImageManager defaultManager] requestAVAssetForVideo:[videos objectAtIndex:index]  options:options resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
    selectedAsset = asset;

//Additional code 2
dispatch_semaphore_signal(semaphore);

}];

//Additional code 3
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);