Question

在iOS 8的Photos.framework中，我试图将UIImage保存到用户的照片库，就像在Safari中长按图像并选择它一样＆＃34;保存图像＆＃34;。在iOS 7中，只需调用ALAssetLibrary＆＃39; writeImageToSavedPhotosAlbum:metadata:completionBlock。

对于iOS 8，我们需要选择一个资产集合来添加PHAsset，但是我无法确定哪个PHAssetCollection最接近只保存给用户＆＃34;相机胶卷＆＃34 ; （尽管在iOS 8中确实没有，但实际上，

）

[[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＆＃34;最近添加＆＃34;智能相册，但它不允许添加新内容。

Answer 1

您不需要使用PHAssetCollection。只需添加：

    [[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#>
        }
    }];

Answer 2

实际上在8.1中，相机胶卷又回来了。这是智能相册，其子类型为SmartAlbumUserLibrary。

哪个PHAssetCollection用于保存图像？

2 个答案: