如何在 iOS 9.0 中将图像保存到特定文件夹

Question

已有答案，使用ALAssetsLibrary将图像保存到特定文件夹。但它在 iOS 9.0 中被弃用并发出警告 "Use PHPhotoLibrary from the Photos framework instead".

当我将 ALAssetsLibrary 更改为 PHPhotoLibrary 时，此时出现错误。

    [self.library saveImage:image toAlbum:@"myAlbum" withCompletionBlock:^(NSError *error) {
    if (error!=nil) {
        NSLog(@"Big error: %@", [error description]);
    }
}];

*错误

 No visible @interface for 'PHPhotoLibrary' declares the selector 'saveImage:toAlbum:withCompletionBlock:'

如何使用 PHPhotoLibrary（或）任何其他解决方案将图像保存到特定文件夹。

提前致谢。

Answer 1

因为没有这样命名的方法

要将图像保存到 PHPhotoLibrary，您需要创建一个资产。参见

Which PHAssetCollection to use for saving an image?

了解详细信息。

Answer 2

我还没有使用过 PHPhotoLibrary 但我知道使用本地文档目录在 Obj-C 中保存照片的老派方法：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = paths.firstObject;
NSData *imageData = UIImagePNGRepresentation(image);

NSString *imagePath = [NSString stringWithFormat:@"%@/%@",documentsDirectory,imageFolder];

BOOL isDir;
NSFileManager *fileManager= [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:imagePath isDirectory:&isDir])
    if(![fileManager createDirectoryAtPath:imagePath withIntermediateDirectories:YES attributes:nil error:NULL])
        NSLog(@"Error: folder creation failed %@", documentsDirectory);

[[NSFileManager defaultManager] createFileAtPath:[NSString stringWithFormat:@"%@/%@", imagePath, imageName] contents:nil attributes:nil];
[imageData writeToFile:[NSString stringWithFormat:@"%@/%@", imagePath, imageName] atomically:YES];

要从 NSDocumentDirectory 检索该图像：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = paths.firstObject;
NSString *fullPath = [NSString stringWithFormat:@"%@/%@", documentDirectory, imagePath]; // image path is same as above
if ([[NSFileManager defaultManager] fileExistsAtPath:fullPath]) {
    UIImage *image = [UIImage imageWithContentsOfFile:fullPath];
    return image;
} else {
    return nil;
}

如何在 iOS 9.0 中将图像保存到特定文件夹

How to save images into specific folder in iOS 9.0

objective-c

ios

alassetslibrary

phphotolibrary

ios9.1