Question

我正在尝试获取PhAsset对象。我想隔离iCloud资产。这是我的代码，

PHFetchResult *cloudAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:nil];

[cloudAlbums enumerateObjectsUsingBlock:^(PHAssetCollection *collection, NSUInteger idx, BOOL *stop){
    if(collection != nil){

        PHFetchResult *result = [PHAsset fetchAssetsInAssetCollection:collection options:fetchOptions];
        [result enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop)
         {
            // check asset is iCloud asset 

         }];
    }

}];

请告诉我如何找到PHAsset是iCloud资产？

Answer 1

这有点像黑客，我不得不挖掘资源数组并进行调试以找出我需要的信息。但它的确有效。虽然这是一个未记录的代码，但我不确定苹果是否会因此而拒绝该应用程序。试一试看看会发生什么！

// asset is a PHAsset object for which you want to get the information    
NSArray *resourceArray = [PHAssetResource assetResourcesForAsset:asset];
BOOL bIsLocallayAvailable = [[resourceArray.firstObject valueForKey:@"locallyAvailable"] boolValue]; // If this returns NO, then the asset is in iCloud and not saved locally yet

您还可以从资源资源中获取一些其他有用的信息，例如 - 原始文件名，文件大小，文件网址等。

Answer 2

实际上有两种情况： 1.照片由此设备捕获，并上传到iCloud。然后，您可以使用progressHandler检查是否需要iCloud下载。

__block BOOL isPhotoInICloud = NO;
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
options.networkAccessAllowed = YES;
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
options.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info){

        isPhotoInICloud = YES;

});

[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {

        if (isPhotoInICloud) {
            // Photo is in iCloud.
        }
});

照片在iCloud中，但是从其他设备上传。而且你没有把它保存到你当地的照片库。因此永远不会调用progressHandler块。我不知道为什么，但这是真的，我认为这是PhotoKit框架的一个错误。对于这种情况，如果使用PHImageResultIsInCloudKey，那也很困难。因为您可以在requestImageForAsset的resultHandler块中知道PHImageResultIsInCloudKey值。但这是照片请求启动后的时间。

所以，至少在我看来，没有办法检查照片是否存储在iCloud中。也许还有其他更好的方法，请告诉我。非常感谢！

Answer 3

当您请求图像时，您会在信息词典中获得一个密钥，该密钥会告诉您该资产是否存在于iCloud中。

[cloudAlbums enumerateObjectsUsingBlock:^(PHAssetCollection *collection, NSUInteger idx, BOOL *stop)
{
    PHFetchResult *result = [PHAsset fetchAssetsInAssetCollection:collection options:fetchOptions];
    [result enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop)
    {  
        PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
        options.resizeMode = PHImageRequestOptionsResizeModeFast;
        options.synchronous = YES;
        __block BOOL isICloudAsset = NO;
        [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:imageSize contentMode:PHImageContentModeAspectFit options:options resultHandler:^(UIImage *result, NSDictionary *info) 
        {
            if ([info objectForKey: PHImageResultIsInCloudKey].boolValue) 
            {
                isICloudAsset = YES;
            }
        }]; 
    }];
}];

Answer 4

以下是一种方法，可以实现获取Photos应用的Videos文件夹中的所有视频，该应用使用带有PHFetchRequest的谓词来仅过滤存储在iPhone本身上的视频，而不是iCloud中的视频：

// Collect all videos in the Videos folder of the Photos app
- (PHFetchResult *)assetsFetchResults {
    __block PHFetchResult *i = self->_assetsFetchResults;
    if (!i) {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            PHFetchOptions *fetchOptions = [PHFetchOptions new];
            fetchOptions.predicate = [NSPredicate predicateWithFormat:@"(sourceType & %d) != 0", PHAssetSourceTypeUserLibrary];
            PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumVideos options:fetchOptions];
            PHAssetCollection *collection = smartAlbums.firstObject;
            if (![collection isKindOfClass:[PHAssetCollection class]]) collection = nil;
            PHFetchOptions *allPhotosOptions = [[PHFetchOptions alloc] init];
            allPhotosOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
            i = [PHAsset fetchAssetsInAssetCollection:collection options:allPhotosOptions];
            self->_assetsFetchResults = i;
        });
    }

    return i;
}

Apple关于PHFetchResult的文档指出，只有一部分属性可以与谓词一起使用;所以，如果上面的代码不适合你，删除PHFetchOptions谓词，并将PHFetchRequest中相应的引用替换为nil：

// Collect all videos in the Videos folder of the Photos app
- (PHFetchResult *)assetsFetchResults {
    __block PHFetchResult *i = self->_assetsFetchResults;
    if (!i) {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumVideos options:nil];
            PHAssetCollection *collection = smartAlbums.firstObject;
            if (![collection isKindOfClass:[PHAssetCollection class]]) collection = nil;
            PHFetchOptions *allPhotosOptions = [[PHFetchOptions alloc] init];
            allPhotosOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
            i = [PHAsset fetchAssetsInAssetCollection:collection options:allPhotosOptions];
            self->_assetsFetchResults = i;
        });
    }

    return i;
}

然后，添加以下行：

// Filter videos that are stored in iCloud
- (NSArray *)phAssets {
    NSMutableArray *assets = [NSMutableArray arrayWithCapacity:self.assetsFetchResults.count];
    [[self assetsFetchResults] enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop) {
        if (asset.sourceType == PHAssetSourceTypeUserLibrary)
                 [assets addObject:asset];
     }];

    return [NSArray arrayWithArray:(NSArray *)assets];
}

Answer 5

这段代码应该可行。如果经常调用此代码，请确保通过PHImageRequestID取消无用请求。

- (PHImageRequestID)checkIsCloud:(PHAsset *)asset cachingImageManager:(PHCachingImageManager *)cachingImageManager {
    if (asset.mediaType == PHAssetMediaTypeVideo) {
        PHVideoRequestOptions *options = [PHVideoRequestOptions new];
        options.deliveryMode = PHVideoRequestOptionsDeliveryModeMediumQualityFormat;
        return [cachingImageManager requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset * _Nullable avAsset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
            if (asset != self.asset) return;
            dispatch_async(dispatch_get_main_queue(), ^{
                if (info[@"PHImageFileSandboxExtensionTokenKey"]) {
                    self.iCloudStatus = KICloudStatusNone;
                } else if ([info[PHImageResultIsInCloudKey] boolValue]) {
                    self.iCloudStatus = KICloudStatusNormal;
                } else {
                    self.iCloudStatus = KICloudStatusNone;
                }
            });
        }];
    } else {
        return [cachingImageManager requestImageDataForAsset:asset options:nil resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
            if (asset != self.asset) return;
            dispatch_async(dispatch_get_main_queue(), ^{
                if ([info[PHImageResultIsInCloudKey] boolValue]) {
                    self.iCloudStatus = KICloudStatusNormal;
                } else {
                    self.iCloudStatus = KICloudStatusNone;
                }
            });
        }];
    }
}

Answer 6

这是Swift 3版本

func checkVideoType(){
    if selectedAsset != nil {
        guard (selectedAsset.mediaType == .video) else {
            print("Not a valid video media type")
            return
        }
        requestID = checkIsiCloud(assetVideo:selectedAsset, cachingImageManager: catchManager)
    }
}

 func checkIsiCloud(assetVideo:PHAsset,cachingImageManager:PHCachingImageManager) -> PHImageRequestID{

        let opt=PHVideoRequestOptions()
        opt.deliveryMode = .mediumQualityFormat
        opt.isNetworkAccessAllowed=true //iCloud video can play
        return cachingImageManager.requestAVAsset(forVideo:assetVideo, options: opt) { (asset, audioMix, info) in

            DispatchQueue.main.async {
                if (info!["PHImageFileSandboxExtensionTokenKey"] != nil) {
                    self.iCloudStatus=false
                    self.playVideo(videoAsset:asset!)
                }else if((info![PHImageResultIsInCloudKey]) != nil) {
                    self.iCloudStatus=true

                }else{
                   self.iCloudStatus=false
                   self.playVideo(videoAsset:asset!)
                }
            }
    }

}

检查给定的PHAsset是iCloud资产吗？

6 个答案: