以下代码加载了也位于iCloud上或者通过流加载的图像。我们怎样才能将搜索限制为仅在相机胶卷中的图像？
var assets = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: nil)
PHAssetCollectionSubtypeAlbumMyPhotoStream（与PHAssetCollectionTypeAlbum一起）- 获取照片流相册。
PHAssetCollectionSubtypeSmartAlbumUserLibrary（与PHAssetCollectionTypeSmartAlbum一起）- 获取相机胶卷相册。
PHAssetCollectionSubtypeSmartAlbumUserLibrary 在我的 iPad 上列出了 14,850 个项目。那是整个照片集合，而不是在我的 iPad 上的内容... - Grimxn如果你和我一样在搜索Objective-C代码，并且由于获取弃用的AssetsLibrary代码未得到新库/照片框架的答案，那么这篇文章可以帮助你：
Swift
全局变量：
func getAllPhotosFromCameraRoll() -> [UIImage] {
// TODO: Add `NSPhotoLibraryUsageDescription` to info.plist
PHPhotoLibrary.requestAuthorization { print($0) } // TODO: Move this line of code to somewhere before attempting to access photos
var images = [UIImage]()
let requestOptions: PHImageRequestOptions = PHImageRequestOptions()
requestOptions.resizeMode = .exact
requestOptions.deliveryMode = .highQualityFormat
requestOptions.isSynchronous = true
let fetchResult: PHFetchResult = PHAsset.fetchAssets(with: .image, options: nil)
let manager: PHImageManager = PHImageManager.default()
for i in 0..<fetchResult.count {
let asset = fetchResult.object(at: i)
manager.requestImage(
for: asset,
targetSize: PHImageManagerMaximumSize,
contentMode: .default,
options: requestOptions,
resultHandler: { (image: UIImage?, info: [AnyHashable: Any]?) -> Void in
if let image = image {
images.append(image)
}
})
}
return images
}
Objective C
全局变量：
NSArray *imageArray;
NSMutableArray *mutableArray;
-(void)getAllPhotosFromCamera
{
imageArray=[[NSArray alloc] init];
mutableArray =[[NSMutableArray alloc]init];
PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];
requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
requestOptions.synchronous = true;
PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];
NSLog(@"%d",(int)result.count);
PHImageManager *manager = [PHImageManager defaultManager];
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[result count]];
// assets contains PHAsset objects.
__block UIImage *ima;
for (PHAsset *asset in result) {
// Do something with the asset
[manager requestImageForAsset:asset
targetSize:PHImageManagerMaximumSize
contentMode:PHImageContentModeDefault
options:requestOptions
resultHandler:^void(UIImage *image, NSDictionary *info) {
ima = image;
[images addObject:ima];
}];
}
imageArray = [images copy]; // You can direct use NSMutuable Array images
}
通过一些实验，我们发现了文档中没有列出的隐藏属性（assetSource）。 基本上，您需要执行常规的获取请求，然后使用谓词来过滤来自相机卷中的内容. 此值应为 3。
示例代码：
//fetch all assets, then sub fetch only the range we need
var assets = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: fetchOptions)
assets.enumerateObjectsUsingBlock { (obj, idx, bool) -> Void in
results.addObject(obj)
}
var cameraRollAssets = results.filteredArrayUsingPredicate(NSPredicate(format: "assetSource == %@", argumentArray: [3]))
results = NSMutableArray(array: cameraRollAssets)
assetSource，它现在会引发异常。 - Rizwan Sattarassets 将是一个 PHFetchResult 对象，而 obj 是 PHAsset 类型的对象。 - CalZonefunc getCameraRoll() -> AlbumModel {
var cameraRollAlbum : AlbumModel!
let cameraRoll = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .smartAlbumUserLibrary, options: nil)
cameraRoll.enumerateObjects({ (object: AnyObject!, count: Int, stop: UnsafeMutablePointer) in
if object is PHAssetCollection {
let obj:PHAssetCollection = object as! PHAssetCollection
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)
let assets = PHAsset.fetchAssets(in: obj, options: fetchOptions)
if assets.count > 0 {
let newAlbum = AlbumModel(name: obj.localizedTitle!, count: assets.count, collection:obj, assets: assets)
cameraRollAlbum = newAlbum
}
}
})
return cameraRollAlbum
}
PHCachingImageManager而不是共享的PHImageManager实例，则在调用requestImageForAsset:targetSize:contentMode:options:resultHandler:时，可以在 PHImageRequestOptions 中设置选项以指定图像为本地图像。
networkAccessAllowed 属性
一个布尔值，指定Photos是否可以从iCloud下载所请求的图像。
networkAccessAllowed
讨论
如果为YES，并且所请求的图像未存储在本地设备上，则Photos将从iCloud下载该图像。要通知下载的进度，请使用progressHandler属性提供块，Photos会在下载图像时定期调用该块。如果为NO（默认值），并且图像不在本地设备上，则结果处理程序的信息字典中的
PHImageResultIsInCloudKey值指示除非启用网络访问，否则无法使用该图像。
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];
for (int i=0; i<[fetchResult count]; i++) {
PHAsset *asset = fetchResult[i];
[asset requestContentEditingInputWithOptions:nil
completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
if ([[info objectForKey:PHContentEditingInputResultIsInCloudKey] intValue] == 1) {
NSLog(@"asset is in cloud");
} else {
NSLog(@"asset is on device");
}
}];
}
-(NSMutableArray *)getNumberOfPhotoFromCameraRoll:(NSArray *)array{
PHFetchResult *fetchResult = array[1];
int index = 0;
unsigned long pictures = 0;
for(int i = 0; i < fetchResult.count; i++){
unsigned long temp = 0;
temp = [PHAsset fetchAssetsInAssetCollection:fetchResult[i] options:nil].count;
if(temp > pictures ){
pictures = temp;
index = i;
}
}
PHCollection *collection = fetchResult[index];
if (![collection isKindOfClass:[PHAssetCollection class]]) {
// return;
}
// Configure the AAPLAssetGridViewController with the asset collection.
PHAssetCollection *assetCollection = (PHAssetCollection *)collection;
PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
self. assetsFetchResults = assetsFetchResult;
self. assetCollection = assetCollection;
self.numberOfPhotoArray = [NSMutableArray array];
for (int i = 0; i<[assetsFetchResult count]; i++) {
PHAsset *asset = assetsFetchResult[i];
[self.numberOfPhotoArray addObject:asset];
}
NSLog(@"%lu",(unsigned long)[self.numberOfPhotoArray count]);
return self.numberOfPhotoArray;
}
你可以获取以下细节
PHFetchResult *fetchResult = self.sectionFetchResults[1];
PHCollection *collection = fetchResult[6];
**value 1,6 used to get camera images**
**value 1,0 used to get screen shots**
**value 1,1 used to get hidden**
**value 1,2 used to get selfies**
**value 1,3 used to get recently added**
**value 1,4 used to get videos**
**value 1,5 used to get recently deleted**
**value 1,7 used to get favorites**
苹果演示 链接
声明你的属性
@property (nonatomic, strong) NSArray *sectionFetchResults;
@property (nonatomic, strong) PHFetchResult *assetsFetchResults;
@property (nonatomic, strong) PHAssetCollection *assetCollection;
@property (nonatomic, strong) NSMutableArray *numberOfPhotoArray;
如果您不想依赖未记录的API，请查看[asset canPerformEditOperation:PHAssetEditOperationContent]。仅当设备上有完整的原始内容时，此选项才返回true。
诚然，这也是脆弱的，但测试表明它适用于所有资产来源类型（照片流，iTunes同步等）。