//videoPath为视频下载到本地之后的本地路径

- (void)saveVideo:(NSString*)videoPath{

    if(videoPath) {

            if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(videoPath)) {

                //保存相册核心代码

                UISaveVideoAtPathToSavedPhotosAlbum(videoPath,self,@selector(video:didFinishSavingWithError:contextInfo:),nil);

            }

    }

}

//保存视频完成之后的回调

- (void)video:(NSString*)videoPathdidFinishSavingWithError:(NSError*)errorcontextInfo:(void*)contextInfo {

    if(error) {

        NSLog(@"保存视频失败%@", error.localizedDescription);

    }

    else{

        NSLog(@"保存视频成功");

    }

}