我如何使用目标c中的照片框架访问照片库中的照片

Question

我是新的Photo框架，我不知道如何使用它。我使用了很多链接，但是我很困惑如何在imageview中显示图像。

我想用照片框架来获取从库中的所有照片我试图

NSMutableOrderedSet *recentsDataSource; 
PHFetchResult *assetCollection = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum | PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:nil]; 
    for (PHAssetCollection *sub in assetCollection) 
    { 
     PHFetchResult *assetsInCollection = [PHAsset fetchAssetsInAssetCollection:sub options:nil]; 

     for (PHAsset *asset in assetsInCollection) 
     { 
      [self.recentsDataSource addObject:asset]; 
     } 
    } 

    if (self.recentsDataSource.count > 0) 
    { 
     NSArray *array = [self.recentsDataSource sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]]]; 
     NSLog(@"Photo Array : %@",array); 
     self.recentsDataSource = [[NSMutableOrderedSet alloc]initWithArray:array]; 
    } 

我必须得到这个类型的数组。

照片阵列：（ “5A2ABD38-D724-42B1-939A-F557D5CCE9FC/L0/001 mediaType的= 1/0， sourceType的= 1，（328x328），creationDate = 2015年10月14日06:06 ：22 + 0000, location = 0，hidden = 0，favorite = 0“， ”5391482F-9887-4518-9976-D5D544CDF8CA/L0/001 mediaType = 1/0, sourceType = 1，（450x800），creationDate = 2015-10-12 09:27:41 +0000， location = 0，hidden = 0，favorite = 1“， ”3B921984-6E79-4E4D-B70D-C7FFB0AC1C63/L0/001 mediaType = 1/0, sourceType = 1，（3000x2002），creationDate = 2012-08-08 09:25:30 +0000, location = 1，hidden = 0，favorite = 0“， “D64D501E-F85D-4EE8-9C79-414272621A80/L0/001 mediaType = 1/0, sourceType = 1，（1668x2500），creationDate = 2012-08-08 08:59:49 +0000, location = 1， hidden = 0，favorite = 0“， ”46A57980-9C55-42A8-9792-6BD98B25F01D/L0/001 mediaType = 1/0, sourceType = 1，（3000x2002），creationDate = 2012-08-08 06:22： 1100000012,location = 1，hidden = 0，favorite = 0“， ”1E040EE9-99A9-4325-AB1F-CBF4E45111DA/L0/001 mediaType = 1/0, sourceType = 1，（4288x2848），creationDate = 2011-03-12 10:47:25 +0000， location = 1，hidden = 0，favorite = 1“， ”BF3A71CD-3065-43C0-A933-DD89BBE8C778/L0/001 mediaType = 1/0， sourceType = 1，（4288x2848），creationDate = 2009-10-09 08:39:20 +0000, location = 0，hidden = 0，favorite = 0“）

如何在imageview上显示图像。

Answer 1

在.H/m文件添加此

#import <Photos/Photos.h> 

全局变量：

@property(nonatomic , strong) PHFetchResult *assetsFetchResults; 
@property(nonatomic , strong) PHCachingImageManager *imageManager; 

viewDidLoad中的代码：

// Fetch all assets, sorted by date created. 
    PHFetchOptions *options = [[PHFetchOptions alloc] init]; 
    options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]]; 
    _assetsFetchResults = [PHAsset fetchAssetsWithOptions:options]; 

    _imageManager = [[PHCachingImageManager alloc] init]; 

numberOfItemsInSection方法：

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section 
{ 
    return [_assetsFetchResults count]; 
} 

UICollectionView cellForItemAtIndexPath：代码：

UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cellID" forIndexPath:indexPath]; 

UIImageView *imageView = (UIImageView *)[cell viewWithTag:101]; 
PHAsset *asset = _assetsFetchResults[indexPath.item]; 

     [_imageManager requestImageForAsset:asset targetSize:imageView.frame.size contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage *result, NSDictionary *info) 
     { 
      imageView.image = result; 
     }]; 

[EDITED]

访问图像：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath 
{ 
    PHAsset *asset = _assetsFetchResults[indexPath.item]; 

    [_imageManager requestImageForAsset:asset targetSize:CGSizeMake(200, 200) contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage *result, NSDictionary *info) 
     { 
      // result is the actual image object. 
     }]; 
}