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http://www.jianshu.com/users/1e0f5e6f73f6/top_articles
- 需要导入第三方框架
#import <Photos/Photos.h>
#import <SVProgressHUD.h>
1.设置用户访问相簿的权限
- (IBAction)save {
/*
PHAuthorizationStatusNotDetermined, 用户还没有做出选择
PHAuthorizationStatusDenied, 用户拒绝当前应用访问相册(用户当初点击了"不允许")
PHAuthorizationStatusAuthorized 用户允许当前应用访问相册(用户当初点击了"好")
PHAuthorizationStatusRestricted, 因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系)
*/
// 判断授权状态
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusRestricted) {
[SVProgressHUD showErrorWithStatus:@"因为系统原因，无法访问相册"];
} else if (status == PHAuthorizationStatusDenied){
// 用户拒绝当前应用访问相册(用户当初点击了"不允许")
PHLog(@"提醒用户去[设置-隐私-照片-xxx]打开访问开关");
} else if (status == PHAuthorizationStatusAuthorized){
//用户允许当前应用访问相册 用户当初点击了好
[self saveImage];
} else if (status == PHAuthorizationStatusNotDetermined){
// 用户还没有做出选择
// 弹框请求用户授权
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
[self saveImage];
}
}];
}
}
2.保护图片
- (void)saveImage
{
// PHAsset : 一个资源, 比如一张图片\一段视频
// PHAssetCollection : 一个相簿
// PHAssetCollection的标识，利用这个标识可以找到对应的PHAssetCollection的对象（相簿对象）
__block NSString *assetCollectionLocalIdentifier = nil;
__block NSString *assetLocalIdentifier = nil;
// PHAsset的标识，利用这个标识可以找到对应的PHAsset对象 即图片对象
// 如果想对"相册"进行修改(增删改), 那么修改代码必须放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//1.保存图片A到【相机胶卷】中
// 创建图片的请求
assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
PHLog(@"保存【图片】到【相机胶卷】中失败！失败信息-%@",error);
return ;
}
// 获得曾经创建过的相簿
PHAssetCollection *createdAssetCollection = [self createdAssetCollection];
if (createdAssetCollection) {
// 3.添加【相机胶卷】中的图片A到【相簿】D中
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 获得图片
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
// 图片添加到相簿中的请求
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];
// 添加图片到相簿
[request addAssets:@[asset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
PHLog(@"添加[图片]到[相簿]失败!失败信息-%@",error);
} else{
PHLog(@"成功添加[图片]到[相簿]!");
}
}];
} else{
// 没有创建过相簿
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
//2.创建"相簿"D
// 创建相簿的请求
assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:PPHAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (!success) {
PHLog(@"保存相簿失败!失败信息-%@",error);
return ;
}
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 3.添加"相机胶卷"中的图片A到新建的"相簿"D中
// 获得相簿
PHAssetCollection *assetCollection = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;
// 获得图片
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
// 添加图片到相簿中的请求
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
// 添加图片到相簿
[request addAssets:@[asset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success == NO) {
PHLog(@"添加[图片]到[相簿]失败!失败信息-%@",error);
} else{
PHLog(@"成功添加[图片]到[相簿]!");
}
}];
}];
}
}];
}
3.创建相册
- (PHAssetCollection *)createdAssetCollection
{
PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections) {
if ([assetCollection.localizedTitle isEqualToString:PPHAssetCollectionTitle]) {
return assetCollection;
}
}
return nil;
}
