ALAssetsLibrary addAssetsGroupAlbumWithName 不适用于 iOS 9 [英] ALAssetsLibrary addAssetsGroupAlbumWithName is not working on iOS 9
问题描述
我需要在 ALAssetsLibrary 中添加名为MyGroupName"的组.所以我使用了下面的代码.
I need to add group with name "MyGroupName" in ALAssetsLibrary . So I have used below code.
ALAssetsLibrary * library = [[ALAssetsLibrary alloc] init];
__weak ALAssetsLibrary *lib = library;
[library addAssetsGroupAlbumWithName:@"MyGroupName" resultBlock:^(ALAssetsGroup *group) {
[lib enumerateGroupsWithTypes:ALAssetsGroupAlbum
usingBlock:^(ALAssetsGroup *g, BOOL *stop)
{
if ([[g valueForProperty:ALAssetsGroupPropertyName] isEqualToString:@"MyGroupName"]) {
NSLog(@"group created with name 'MyGroupName'");
}
}failureBlock:^(NSError *error){
NSLog(@"failure %@",error);
}
];
} failureBlock:^(NSError *error) {
NSLog(@"failure %@",error);
}];
但在 "enumerateGroupsWithTypes" 中,组 "g" 在 iOS 9.3.1 (iphone 6) 中始终为零.它工作正常,并在 iOS 9.3.1 iphone 5 上使用名称MyGroupName"创建组.我想知道为什么上面的代码在 iphone 6 上不起作用,是否有任何解决方案可以使其工作?
but inside "enumerateGroupsWithTypes" , group "g" is always nil in iOS 9.3.1 (iphone 6). its working correctly and group created with name "MyGroupName" on iOS 9.3.1 iphone 5. I want to know why above code is not working on iphone 6 and is there any solution to make it work ?
请帮帮我.提前致谢
推荐答案
1) First Import
#import <Photos/Photos.h>
#import <Photos/PHAsset.h>
#import <AssetsLibrary/AssetsLibrary.h>
2) 为 ALAsset 设置属性
@property (nonatomic, strong) ALAssetsLibrary* assetsLibrary;
3) 然后在你的 .m 文件中分配 ALAsset 库
- (ALAssetsLibrary*)assetsLibrary
{
if (!_assetsLibrary) {
_assetsLibrary = [[ALAssetsLibrary alloc] init];
[ALAssetsLibrary disableSharedPhotoStreamsSupport];
}
return _assetsLibrary;
}
4 ) 现在创建将图像保存到自定义相册的方法
- (void)saveImageDatas:(UIImage*)imageDatas toAlbum:(NSString*)album withCompletionBlock:(void(^)(NSError *error))block
{
` if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
NSMutableArray* assets = [[NSMutableArray alloc]init];
PHAssetChangeRequest* assetRequest;
@autoreleasepool {
assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:imageDatas];
[assets addObject:assetRequest.placeholderForCreatedAsset];
}
__block PHAssetCollectionChangeRequest* assetCollectionRequest = nil;
PHFetchResult* result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
[result enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
PHAssetCollection* collection = (PHAssetCollection*)obj;
if ([collection isKindOfClass:[PHAssetCollection class]]) {
if ([[collection localizedTitle] isEqualToString:album]) {
assetCollectionRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];
[assetCollectionRequest addAssets:assets];
*stop = YES;
}
}
}];
if (assetCollectionRequest == nil) {
assetCollectionRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:album];
[assetCollectionRequest addAssets:assets];
}
}
completionHandler:^(BOOL success, NSError *error) {
if (block) {
block(error);
}
}];
}
else {
__weak ALAssetsLibrary* lib = [self assetsLibrary];
[[self assetsLibrary] writeImageDataToSavedPhotosAlbum:UIImageJPEGRepresentation(imageDatas, 1.0) metadata:nil completionBlock:^(NSURL* assetURL, NSError* error) {
if (error != nil) {
return;
}
__block BOOL albumWasFound = NO;
[lib enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup* group, BOOL* stop) {
if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:album]) {
albumWasFound = YES;
[lib assetForURL:assetURL resultBlock:^(ALAsset* asset){
[group addAsset:asset];
if (block) {
block(nil);
}
}failureBlock:^(NSError* error) {
if (block) {
block(error);
}
}];
return;
}
if (group == nil && albumWasFound == NO) {
[lib addAssetsGroupAlbumWithName:album resultBlock:^(ALAssetsGroup* group) {
} failureBlock:^(NSError* error) {
[lib assetForURL:assetURL resultBlock:^(ALAsset* asset){
[group addAsset:asset];
if (block) {
block(nil);
}
}failureBlock:^(NSError* error) {
if (block) {
block(error);
}
}];
}];
}
} failureBlock:^(NSError* error) {
if (block) {
block(error);
}
}];
}];
}
}
5 ) 现在调用这个方法来保存图像
[self saveImageDatas:myimage toAlbum:@"MyGroupName" withCompletionBlock:^(NSError *error) {
if (!error) {
NSLog(@"Sucess");
}
}];
myimage"是您要保存的图像.
这篇关于ALAssetsLibrary addAssetsGroupAlbumWithName 不适用于 iOS 9的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!