最近项目中在做一个社交圈的功能，可以选取相册中的图片分享一些图片，在iOS8.0之后，用主要用photokit来对照片进行选取，iOS官方也写了一个官方的demophotokitAppleDemo，是用collectionview来做边查询边展示的，我主要介绍一下对相册的增删查。
- 第一查询最近添加相册
// 2 206 最近添加
//获得PHAssetCollectionTypeSmartAlbum PHAssetCollectionSubtypeSmartAlbumRecentlyAdded类型的所有相册，系统中的最近添加相册只有一个，可以直接取第一个元素。
PHFetchResult<PHAssetCollection *> *assetSmartCollection=[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumRecentlyAdded options:nil];
if (assetSmartCollection4.count>0) {
PHAssetCollection*recentlyAddedAlbum= assetSmartCollection.firstObject
NSString*albumName= recentlyAddedAlbum.localizedTitle;
//按照相片的创造时间查询相册里面的图片
PHFetchOptions *photosOptions = [[PHFetchOptions alloc] init];
photosOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
//每一个asset对应一个图片
PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:collection options:photosOptions];
//相册中图片的数量
NSInterger photoTotalCount= assets.count;
}
- 根据PHAsset获取具体的图片
// 同步获得图片, 只会返回1张图片
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
//是否同步，设为YES只会返回你设置图片大小尺寸的图片，设为NO之后，会返回一张缩略图和一张你设置尺寸的图片
options.synchronous = YES;
options.resizeMode=PHImageRequestOptionsResizeModeFast;
options.networkAccessAllowed=YES;
// 是否要原图
CGFloat scale = [UIScreen mainScreen].scale;
CGSize cellSize = CGSizeMake([UIScreen mainScreen].bounds.size.width/3.0, [UIScreen mainScreen].bounds.size.width/3.0);
CGSize size = CGSizeMake(cellSize.width * scale, cellSize.height/2.0 * scale);
// 从asset中获得图片
[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
if (result) {
_imageObject=result;
}
}];
- 增加一个名字为HelloWorld的相册
__block PHObjectPlaceholder *albumPlaceholder;
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetCollectionChangeRequest *changeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"HelloWorld"];
albumPlaceholder = changeRequest.placeholderForCreatedAssetCollection;
} completionHandler:^(BOOL success, NSError *error) {
if (success) {
NSLog(@"添加相册成功");
} completionHandler:^(BOOL success, NSError *error) {
if (!success) {
NSLog(@"Error creating asset: %@", error);
}
}];
- 向HelloWorld相册添加一张照片
PHAssetCollection*oneAlbumColleciton;
//获取所有的相册信息 (在查询相册信息中已讲)，然后遍历，根据名字找到HelloWorld相册
if ([oneAlbumColleciton.localizedTitle isEqualToString:@"HelloWorld"]) {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
PHAssetChangeRequest *assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:saveImage];
PHAssetCollectionChangeRequest *assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection: oneAlbumColleciton];
[assetCollectionChangeRequest addAssets:@[[assetChangeRequest placeholderForCreatedAsset]]];
} completionHandler:^(BOOL success, NSError *error) {
if (!success) {
DLOG(@"Error creating asset: %@", error);
}else{
}
}];
}
- 在相册中删除某张照片
PHFetchResult *assetResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:photosOptions];
[assetResult enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([asset isEqual:obj]) {
//删除图片
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
[PHAssetChangeRequest deleteAssets:@[obj]];
} completionHandler:^(BOOL success, NSError *error) {
DLOG(@"currentThread:%d",[NSThread isMainThread]);
if (success) {
else{
NSLog(@"Error: %@", error);
}
}];
}
}];
