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iOS APP删除系统相册中选中的图片

2016-05-18 16:59 543 查看
app有一个新功能是在app中删除相册的照片。  8之前还是AssetsLibary处理

iOS 8+通过Photos.framework #import <Photos/Photos.h> 

1.添加图片

//首先获取相册的集合
PHFetchResult *collectonResuts = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:[PHFetchOptions new]] ;
//对获取到集合进行遍历
[collectonResuts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
PHAssetCollection *assetCollection = obj;
//Camera Roll是我们写入照片的相册
if ([assetCollection.localizedTitle isEqualToString:@"Camera Roll"]) {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//请求创建一个Asset
PHAssetChangeRequest *assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"pet"]];
//请求编辑相册
PHAssetCollectionChangeRequest *collectonRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
//为Asset创建一个占位符,放到相册编辑请求中
PHObjectPlaceholder *placeHolder = [assetRequest placeholderForCreatedAsset ];
//相册中添加照片
[collectonRequest addAssets:@[placeHolder]];
} completionHandler:^(BOOL success, NSError *error) {
NSLog(@"Error:%@", error);
}];
}
}];

2.删除最后一张图片

PHFetchResult *collectonResuts = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAny options:[PHFetchOptions new]] ;
[collectonResuts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
PHAssetCollection *assetCollection = obj;
if ([assetCollection.localizedTitle isEqualToString:@"Camera Roll"]) {
PHFetchResult *assetResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:[PHFetchOptions new]];
[assetResult enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//获取相册的最后一张照片
if (idx == [assetResult count] - 1) {
[PHAssetChangeRequest deleteAssets:@[obj]];
}
} completionHandler:^(BOOL success, NSError *error) {
NSLog(@"Error: %@", error);
}];
}];
}
}];

3.删除选中的图片

// NSURL *url= [info objectForKey:UIImagePickerControllerReferenceURL];
PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[url] options:nil];
PHAsset *asset = [result lastObject];

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
[PHAssetChangeRequest deleteAssets:@[asset]];
} completionHandler:^(BOOL success, NSError *error) {
NSLog(@"Error: %@", error);
}];
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