/*一、保存图片到【自定义相册】1.保存图片到【相机胶卷】1> C语言函数UIImageWriteToSavedPhotosAlbum2> AssetsLibrary框架3> Photos框架2.拥有一个【自定义相册】1> AssetsLibrary框架2> Photos框架3.添加刚才保存的图片到【自定义相册】1> AssetsLibrary框架2> Photos框架*/
- (IBAction)save:(UIButton *)sender {/*保存到相册步骤：1.保存图片到【相机胶卷】2.拥有一个【自定义相册】3.将刚才保存到【相机胶卷中的图片】引用到【自定义相册】*/UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{if (error) {[SVProgressHUD showErrorWithStatus:@"保存失败！"];} else {[SVProgressHUD showSuccessWithStatus:@"保存成功！"];}
}

/*
//补充错误信息：-[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]错误解释：参数越界错误，方法的参数个数和实际传递的参数个数不一致*/

/*
二、Photos框架须知1.PHAsset : 一个PHAsset对象就代表相册中的一张图片或者一个视频1> 查 : [PHAsset fetchAssets...]2> 增删改 : PHAssetChangeRequest(包括图片\视频相关的所有改动操作)2.PHAssetCollection : 一个PHAssetCollection对象就代表一个相册1> 查 : [PHAssetCollection fetchAssetCollections...]2> 增删改 : PHAssetCollectionChangeRequest(包括相册相关的所有改动操作)3.对相片\相册的任何【增删改】操作，都必须放到以下方法的block中执行-[PHPhotoLibrary performChanges:completionHandler:]-[PHPhotoLibrary performChangesAndWait:error:]*//*Foundation和Core Foundation的数据类型可以互相转换，比如NSString *和CFStringRefNSString *string = (__bridge NSString *)kCFBundleNameKey;CFStringRef string = (__bridge CFStringRef)@"test";获得相机胶卷相册[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil]*//*错误信息：This method can only be called from inside of -[PHPhotoLibrary performChanges:completionHandler:] or -[PHPhotoLibrary performChangesAndWait:error:] // 异步执行修改操作[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{[PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image];} completionHandler:^(BOOL success, NSError * _Nullable error) {if (error) {[SVProgressHUD showErrorWithStatus:@"保存失败！"];} else {[SVProgressHUD showSuccessWithStatus:@"保存成功！"];}}];// 同步执行修改操作NSError *error = nil;[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{[PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image];} error:&error];if (error) {[SVProgressHUD showErrorWithStatus:@"保存失败！"];} else {[SVProgressHUD showSuccessWithStatus:@"保存成功！"];}
*/

- (IBAction)save:(UIButton *)sender {/*保存到相册步骤：1.保存图片到【相机胶卷】2.拥有一个【自定义相册】3.将刚才保存到【相机胶卷中的图片】引用到【自定义相册】*/NSError *error = nil;// 保存图片到【相机胶卷】[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{[PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image];} error:&error];if (error) {[SVProgressHUD showErrorWithStatus:@"保存失败！"];} else {[SVProgressHUD showSuccessWithStatus:@"保存成功！"];}
}

/** 当前App对应的自定义相册 */
- (PHAssetCollection *)createdCollection;- (IBAction)save:(UIButton *)sender {/*保存到相册步骤：1.保存图片到【相机胶卷】2.拥有一个【自定义相册】3.将刚才保存到【相机胶卷中的图片】引用到【自定义相册】*/[self createdCollection];
}#pragma mark - 获得当前App对应的自定义相册
- (PHAssetCollection *)createdCollection
{// 获得软件名字NSString *title = [NSBundle mainBundle].infoDictionary[(__bridge NSString *)kCFBundleNameKey];// 抓取所有的自定义相册PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];// 查找当前App对应的自定义相册for (PHAssetCollection *collection in collections) {if ([collection.localizedTitle isEqualToString:title]) {return collection;}}/** 当前App对应的自定义相册没有被创建过 **/// 创建一个【自定义相册】NSError *error = nil;__block NSString *createdCollectionID = nil;[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{       createdCollectionID = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title].placeholderForCreatedAssetCollection.localIdentifier;} error:&error];if (error) {[SVProgressHUD showErrorWithStatus:@"创建相册失败！"];return nil;}// 根据唯一标识获得刚才创建的相册return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject;
}
/*Foundation和Core Foundation的数据类型可以互相转换，比如NSString *和CFStringRefNSString *string = (__bridge NSString *)kCFBundleNameKey;CFStringRef string = (__bridge CFStringRef)@"test";获得相机胶卷相册[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil]*/

#pragma mark - 获得当前App对应的自定义相册
// 根据唯一标识获得刚才创建的相册return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject;

/** 当前App对应的自定义相册 */
- (PHAssetCollection *)createdCollection;
/** 返回刚才保存到【相机胶卷】的图片 */
- (PHFetchResult<PHAsset *> *)createdAssets;- (IBAction)save:(UIButton *)sender {PHAuthorizationStatus oldStatus = [PHPhotoLibrary authorizationStatus];// 请求\检查访问权限 :// 如果用户还没有做出选择，会自动弹框，用户对弹框做出选择后，才会调用block// 如果之前已经做过选择，会直接执行block[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {dispatch_async(dispatch_get_main_queue(), ^{if (status == PHAuthorizationStatusDenied) { // 用户拒绝当前App访问相册if (oldStatus != PHAuthorizationStatusNotDetermined) {HKLog(@"提醒用户打开开关")}} else if (status == PHAuthorizationStatusAuthorized) { // 用户允许当前App访问相册
                [self saveImageIntoAlbum];} else if (status == PHAuthorizationStatusRestricted) { // 无法访问相册[SVProgressHUD showErrorWithStatus:@"因系统原因，无法访问相册！"];}});}];
}/***  保存图片到相册*/
- (void)saveImageIntoAlbum
{// 获得相片PHFetchResult<PHAsset *> *createdAssets = self.createdAssets;if (createdAssets == nil) {[SVProgressHUD showErrorWithStatus:@"保存图片失败！"];return;}// 获得相册PHAssetCollection *createdCollection = self.createdCollection;if (createdCollection == nil) {[SVProgressHUD showErrorWithStatus:@"创建或者获取相册失败！"];return;}// 添加刚才保存的图片到【自定义相册】NSError *error = nil;[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdCollection];[request insertAssets:createdAssets atIndexes:[NSIndexSet indexSetWithIndex:0]];} error:&error];// 最后的判断if (error) {[SVProgressHUD showErrorWithStatus:@"保存图片失败！"];} else {[SVProgressHUD showSuccessWithStatus:@"保存图片成功！"];}
}#pragma mark - 获得当前App对应的自定义相册
- (PHAssetCollection *)createdCollection
{// 获得软件名字NSString *title = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"];// 抓取所有的自定义相册PHFetchResult<PHAssetCollection *> *collections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];// 查找当前App对应的自定义相册for (PHAssetCollection *collection in collections) {if ([collection.localizedTitle isEqualToString:title]) {return collection;}}/** 当前App对应的自定义相册没有被创建过 **/// 创建一个【自定义相册】NSError *error = nil;__block NSString *createdCollectionID = nil;[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{createdCollectionID = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title].placeholderForCreatedAssetCollection.localIdentifier;} error:&error];if (error) return nil;// 根据唯一标识获得刚才创建的相册return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[createdCollectionID] options:nil].firstObject;
}- (PHFetchResult<PHAsset *> *)createdAssets
{NSError *error = nil;__block NSString *assetID = nil;// 保存图片到【相机胶卷】[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{assetID = [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;} error:&error];if (error) return nil;// 获取刚才保存的相片return [PHAsset fetchAssetsWithLocalIdentifiers:@[assetID] options:nil];
}//补充：不带权限判断
//- (IBAction)save {
//    NSError *error = nil;
//
//    // 保存图片到【相机胶卷】
//    __block PHObjectPlaceholder *placeholder = nil;
//    [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
//        placeholder = [PHAssetChangeRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset;
//    } error:&error];
//    if (error) {
//        [SVProgressHUD showErrorWithStatus:@"保存图片失败！"];
//        return;
//    }
//
//    // 获得相册
//    PHAssetCollection *createdCollection = self.createdCollection;
//    if (createdCollection == nil) {
//        [SVProgressHUD showErrorWithStatus:@"创建相册失败！"];
//        return;
//    }
//
//    // 添加刚才保存的图片到【自定义相册】
//    [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
//        PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdCollection];
//        [request insertAssets:@[placeholder] atIndexes:[NSIndexSet indexSetWithIndex:0]];
//    } error:&error];
//
//    // 最后的判断
//    if (error) {
//        [SVProgressHUD showErrorWithStatus:@"保存图片失败！"];
//    } else {
//        [SVProgressHUD showSuccessWithStatus:@"保存图片成功！"];
//    }
//}