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;
}
