我正在将新创建的视频文件保存在本地文档中。然后,我想使用“照片”框架将其复制到“照片库”中。
问题是,即使正在写出视频(并且我可以确认视频在那里并且可以观看),以下创建请求也始终返回nil:
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// NSString filePath points to the newly-created file in Documents directory
NSParameterAssert([[NSFileManager defaultManager] isReadableFileAtPath:filePath]);
// path looks fine
NSURL* url = [NSURL URLWithString:filePath];
PHAssetChangeRequest* createAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];
// got back nil from creationRequestForAssetFromVideoAtFileURL, so we will assert out here
NSParameterAssert(createAssetRequest);
}
completionHandler:^(BOOL success, NSError *error) {}];
最佳答案
毫不奇怪,URL是问题所在。 url = [NSURL URLWithString:filePath]
不指向电影文件。如果通过以下方式获取(例如)url
很好:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *documentsURL = [[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
NSArray *contents = [fileManager contentsOfDirectoryAtURL:documentsURL
includingPropertiesForKeys:@[]
options:NSDirectoryEnumerationSkipsHiddenFiles
error:nil];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"lastPathComponent == 'movie.mov'"];
NSURL* url = nil;
for (NSURL *fileURL in [contents filteredArrayUsingPredicate:predicate]) {
url = fileURL;
}
关于ios - 创建视频 Assets 时,PHAssetChangeRequest始终返回nil,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/31527436/