使用PHAsset获取图片时避免重复 [英] Avoiding duplicates when getting pictures with PHAsset

问题描述

在iOS 8上，我希望将所有图片存储在设备上。我的问题是我确实得到了它们，但有些不止一次。 PHAsset 属性（隐藏，mediaSubtypes等）对于所有图片都是相同的，所以我不能排除 PHAssetMediaSubtypePhotoHDR 子类型。我找到的唯一方法是不添加具有相同日期的多张图片，但是当使用相同的创建日期保存多张照片时，这是一个问题。

On iOS 8, I want to get all pictures stored on the device. My problem is that I do get them, but some are present more than once. The PHAsset properties (hidden, mediaSubtypes, etc.) are the same for all pictures, so I can't for example rule out the PHAssetMediaSubtypePhotoHDR subtypes. The only way I found is not adding multiple pictures with the same date, but this is a problem when multiple photos were saved with the same creation date.

有人知道为什么我得到了这些副本以及我可以做些什么来避免它们？

Does anybody know why I get these duplicates and what I can do to avoid them?

这就是我得到图片的方式：

This is how I get the pictures:

    PHFetchOptions *fetchOptions = [PHFetchOptions new];
    fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES],];
    PHFetchResult *phAssets = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:fetchOptions];

推荐答案

您可以尝试使用Moments Collections：

You can try to use Moments Collections:

PHFetchResult * moments = [PHAssetCollection fetchMomentsWithOptions:nil];            
for (PHAssetCollection * moment in moments) {
    PHFetchResult * assetsFetchResults = [PHAsset fetchAssetsInAssetCollection:moment options:nil];
    for (PHAsset * asset in assetsFetchResults) {
        //Do something with asset, for example add them to array
    }
}

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