iOS开发 保存图片到自定义相册

话不多说，直接上代码

简单说下保存到系统相册的方法

- (IBAction)save {

// 存储图片到"相机胶卷"

UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}

// 成功保存图片到相册中, 必须调用此方法, 否则会报参数越界错误

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{

if (error) {

}

}

下面是保存到自定义相册的方法

- (IBAction)saveButtonDidClick:(id)sender {

// 判断状态

PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

if (status == PHAuthorizationStatusDenied) {

NSLog(@"用户拒绝当前应用访问相册,我们需要提醒用户打开访问开关");

}else if (status == PHAuthorizationStatusRestricted){

NSLog(@"家长控制,不允许访问");

}else if (status == PHAuthorizationStatusNotDetermined){

NSLog(@"用户还没有做出选择");

[self saveImage];

}else if (status == PHAuthorizationStatusAuthorized){

NSLog(@"用户允许当前应用访问相册");

[self saveImage];

}

}

- (void)saveImage {

/*

PHAsset : 一个PHAsset对象就代表一个资源文件,比如一张图片

PHAssetCollection : 一个PHAssetCollection对象就代表一个相册

*/

__block NSString *assetId = nil;

// 1. 存储图片到"相机胶卷"

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

// 这个block里保存一些"修改"性质的代码

// 新建一个PHAssetCreationRequest对象, 保存图片到"相机胶卷"

// 返回PHAsset(图片)的字符串标识

assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"3.jpg"]].placeholderForCreatedAsset.localIdentifier;

} completionHandler:^(BOOL success, NSError * _Nullable error) {

if (error) {

NSLog(@"保存图片到相机胶卷中失败");

return;

}

NSLog(@"成功保存图片到相机胶卷中");

// 2. 获得相册对象

PHAssetCollection *collection = [self collection];

// 3. 将“相机胶卷”中的图片添加到新的相册

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];

// 根据唯一标示获得相片对象

PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].firstObject;

// 添加图片到相册中

[request addAssets:@[asset]];

} completionHandler:^(BOOL success, NSError * _Nullable error) {

if (error) {

NSLog(@"添加图片到相册中失败");

return;

}

NSLog(@"成功添加图片到相册中");

[[NSOperationQueue mainQueue] addOperationWithBlock:^{

NSLog(@"保存成功");

}];

}];

}];

}

- (PHAssetCollection *)collection{ // 先获得之前创建过的相册 PHFetchResult*collectionResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];

for (PHAssetCollection *collection in collectionResult) {

if ([collection.localizedTitle isEqualToString:self.albumName]) {

return collection;

}

}

// 如果相册不存在,就创建新的相册(文件夹)

__block NSString *collectionId = nil; // __block修改block外部的变量的值

// 这个方法会在相册创建完毕后才会返回

[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{

// 新建一个PHAssertCollectionChangeRequest对象, 用来创建一个新的相册

collectionId = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:self.albumName].placeholderForCreatedAssetCollection.localIdentifier;

} error:nil];

return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[collectionId] options:nil].firstObject;

}