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?
这有点像黑客,我必须挖掘资源数组并进行调试才能找到我所需的信息。但它有效。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。尝试一下,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
您还可以从资产资源中获取其他一些有用的信息,例如 - 原始文件名、文件大小、文件 URL 等
其实有2种情况: 1. 照片由该设备拍摄,并上传至 iCloud。然后,您可以使用progressHandler来检查是否需要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.
}
});
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!
当您请求图像时,您会在信息字典中获得一个键,它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;
}
}];
}];
}];
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!)
}
}
}
}
您可以实现以下方法来获取“照片”应用程序的“视频”文件夹中的所有视频,该方法使用带有 PHFetchRequest 的谓词来仅过滤存储在 iPhone 本身而不是 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,只有属性的子集可以与谓词一起使用;因此,如果上面的代码不适合您,请删除 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,添加这一行:
// 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];
}
这段代码应该可以工作。 如果频繁调用此代码,请务必通过 PHImageRequestID 取消无用的请求。
- (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;
}
});
}];
}
}
这是 Swift 5 版本
extension PHAsset {
var isLocallyAvailable: Bool? {
let resourceArray = PHAssetResource.assetResources(for: self)
return resourceArray.first?.value(forKey: "locallyAvailable") as? Bool
}
}
PHAsset
类有一个名为sourceType
的属性,类型为PHAssetSourceType
,它可以有三个可能的值:.typeUserLibrary
、.typeCloudShared
和.typeiTunesSynced
。您可以按如下方式进行比较,检查 PHAsset
是否代表 iCloud 照片:
if asset.sourceType == .typeUserLibrary {
// The PHAsset is a local photo
} else {
// The PHAsset is from iCloud
}
在代码中,
asset
是类型PHAsset
。