哪个PHAssetCollection用于保存图像？

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问题描述

在iOS 8的Photos.framework中，我正在尝试将UIImage保存到用户的照片库，就像在Safari中长按图像并选择保存图像一样。在iOS 7中，这只需要调用ALAssetLibrary的 writeImageToSavedPhotosAlbum：metadata：completionBlock 。

In iOS 8's Photos.framework, I'm trying to save a UIImage to the user's photo library, much in the same way you can long-press an image in Safari and choose the "Save Image". In iOS 7, this would be by just calling ALAssetLibrary's writeImageToSavedPhotosAlbum:metadata:completionBlock.

对于iOS 8，我们需要选择一个资产集合来添加一个PHAsset，但我无法弄清楚哪个PHAssetCollection最接近只保存到用户的相机滚动（即使没有一个，真的，在iOS 8中）

For iOS 8 we need to pick an asset collection to add a PHAsset to, but I can't figure out which PHAssetCollection is closest to just saving to the user's "camera roll" (even though there isn't one, really, in iOS 8)

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetChangeRequest *newAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
    newAssetRequest.creationDate = time;
    newAssetRequest.location = location;

    PHObjectPlaceholder *placeholderAsset = newAssetRequest.placeholderForCreatedAsset;

    PHAssetCollectionChangeRequest *addAssetRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:WHICH_ASSET_COLLECTION];
    addAssetRequest addAssets:@[placeholderAsset];

} completionHandler:^(BOOL success, NSError *error) {
    NSLog(@"Success: %d", success);
}];

我尝试访问最近添加的智能相册，但不允许向其中添加新内容。

I tried accessing the "Recently Added" smart album, but it does not allow adding new content to it.

推荐答案

你不需要乱用PHAssetCollection。只需添加：

You don't need to mess around with PHAssetCollection. Just add by doing:

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:<#your photo here#>];
    } completionHandler:^(BOOL success, NSError *error) {
        if (success) {
            <#your completion code here#>
        }
        else {
            <#figure out what went wrong#>
        }
    }];

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ios