網(wǎng)上很多PHAsset轉(zhuǎn)UIImage的代碼，沒有UIImage轉(zhuǎn)PHAsset的，今天有個同學(xué)剛好問，我正好研究一下，直接上代碼吧：

? ? UIImage*image = [UIImageimageNamed:@"image"];

? ? [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{

? ? ? ? PHAssetChangeRequest *request = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

? ? ? ? NSString *localIndentifier = request.placeholderForCreatedAsset.localIdentifier;

? ? ? ? PHFetchResult*assetResult = [PHAssetfetchAssetsWithLocalIdentifiers:@[localIndentifier]options:nil];

? ? ? ? PHAsset*asset = assetResult.firstObject;

? ? }error:nil];

另外需要注意，轉(zhuǎn)換代碼一定要寫在PHPhotoLibrary的

- (void)performChanges:(dispatch_block_t)changeBlock completionHandler:(nullable void(^)(BOOL success, NSError *__nullable error))completionHandler;

或者

- (BOOL)performChangesAndWait:(dispatch_block_t)changeBlock error:(NSError *__autoreleasing *)error;

中，不然會報異常：

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This method can only be called from inside of -[PHPhotoLibrary performChanges:completionHandler:] or -[PHPhotoLibrary performChangesAndWait:error:]'