iOS 保存图片到自定义相册
【iOS 保存图片到自定义相册】iOS 10开始，保存图片要获得隐私权限，要在info.plist添加一项key是Privacy - Photo Library Usage Description 要不然会报错
文章图片
保存按钮点击事件
- (void)save {
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) {
DLog(@"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！"];
}
});
}];
}#pragma mark - 保存图片到自定义相册
- (void)saveImageIntoAlbum
{
// 获得相片
PHFetchResult *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APP名字
NSString *title = [NSBundle mainBundle].infoDictionary[(__bridge NSString *)kCFBundleNameKey];
// 抓取所有的自定义相册
PHFetchResult *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;
}
#pragma mark - 获得相片
- (PHFetchResult *)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];
}如果只是保存到系统相册
C语言函数UIImageWriteToSavedPhotosAlbum 一个函数搞定注意：
// Adds a photo to the saved photos album.The optional completionSelector should have the form:
意思就是要实现下面格式的方法，要不然会报错
//- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
