添加资源到相册中是比较常见的需求,这份代码是给一些有这方面需求,但是又比较懒,不想看Photos框架的同学们准备的.
注:以下代码均未封装,可以直接copy使用.
- 需求一:直接添加图片到相机胶卷
// 写入图片到相机胶卷
- (void)writeImageToAssetsLibrary:(UIImage *)image {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *creationRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
PHFetchResult *fetchreult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
PHAssetCollection *assetCollection = fetchreult.firstObject;
PHAssetCollectionChangeRequest *addAssetRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
PHObjectPlaceholder * assetPlaceholder = creationRequest.placeholderForCreatedAsset;
[addAssetRequest addAssets:@[assetPlaceholder]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
}];
}
- 需求二:写入图片到指定相册,如果没有,则创建一个
- (void)writeImageWithoutWatermark:(UIImage *)image albumTitle:(NSString *)albumTitle completion:(FCHPhotoSaveCompletion)completion {
if ([PHPhotoLibrary authorizationStatus] == PHAuthorizationStatusAuthorized) {
__block PHAssetCollection *assetAlbum = nil;
if (albumTitle.length == 0 && !albumTitle) {
// 相册名为空或者长度错误直接保存系统相册
PHFetchResult *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil];
assetAlbum = [result firstObject];
}
else {
PHFetchResult<PHAssetCollection *> *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:nil];
[result enumerateObjectsUsingBlock:^(PHAssetCollection * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
// 相册是否存在
if ([albumTitle isEqualToString:obj.localizedTitle]) {
assetAlbum = obj;
*stop = YES;
}
}];
if (!assetAlbum) {
// 不存在创建相册
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
[PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:albumTitle];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
// 相册创建成功保存图片
[self writeImageWithoutWatermark:image albumTitle:albumTitle completion:completion];
}];
}
}
// 保存逻辑
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
PHObjectPlaceholder *assetPlaceholder = changeRequest.placeholderForCreatedAsset;
PHAssetCollectionChangeRequest *albumChangeRequset = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetAlbum];
[albumChangeRequset addAssets:@[assetPlaceholder]];
} completionHandler:completion];
}
else {
completion(NO, [NSError errorWithDomain:@"Write Album Error" code:0 userInfo:@{NSLocalizedFailureReasonErrorKey: @"Authorization Failure"}]);
}
}
如果对Photos感兴趣,请进一步阅读:
