Ios 如何在我的collectionView中获取“瞬间”相册和所有个人相册？

我正在尝试使用

照片框架

。在我的

收藏视图

中，我想显示

相机卷

和

个人相册

的海报图像

我试图以这种方式实现代码，但我仍然看到每个相册的相同图像。。。我哪里做错了

我把代码放在这里。。。我希望有人能帮助我

//USER ALBUM
@property (nonatomic, strong) PHFetchResult *userAlbum;
@property (nonatomic, strong) PHAssetCollection *assetCollection;
@property (nonatomic, strong) PHAsset *asset;


-(void)viewDidLoad {
    [super viewDidLoad];

    PHFetchOptions *userAlbumsOptions = [[PHFetchOptions alloc] init];
    userAlbumsOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];

    self.userAlbum = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum | PHAssetCollectionTypeMoment  subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];

    for (NSInteger i =0; i < self.userAlbum.count; i++) {
        self.assetCollection = [self.userAlbum objectAtIndex:i];
        NSLog(@"%@",[self.assetCollection.localizedTitle uppercaseString]);

        PHFetchResult *fetchResult = [PHAsset fetchKeyAssetsInAssetCollection:self.assetCollection options:nil];
        self.asset = [fetchResult firstObject];
 }
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.userAlbum.count;
}


-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {

        KCCategoryCell *catCell = [collectionView dequeueReusableCellWithReuseIdentifier:categoryCellID forIndexPath:indexPath];

        CGFloat retina = [UIScreen mainScreen].scale;
        CGSize square = CGSizeMake(catCell.albumImage.bounds.size.width * retina, catCell.bounds.size.height * retina);

        [[PHImageManager defaultManager] requestImageForAsset:self.asset targetSize:square  contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
                catCell.albumImage.image = result;
        }];

        return catCell;
}

//用户相册
@属性（非原子，强）PHFetchResult*userAlbum；
@属性（非原子、强）相集合*资产集合；
@属性（非原子、强）相集*资产；
-（无效）viewDidLoad{
[超级视图下载]；
PHFetchOptions*userAlbumsOptions=[[PHFetchOptions alloc]init]；
userAlbumsOptions.sortDescriptors=@[[NSSortDescriptor SortDescriptor WithKey:@“creationDate”升序：是]；
self.userAlbum=[PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum | PHAssetCollectionTypeMoment子类型：PhasSetCollectionSubtypeAlbum常规选项：nil]；
对于（NSInteger i=0；i

您之所以看到相同的图像，是因为您正在为所有索引请求相同的资产：

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {

    KCCategoryCell *catCell = [collectionView dequeueReusableCellWithReuseIdentifier:categoryCellID forIndexPath:indexPath];

    CGFloat retina = [UIScreen mainScreen].scale;
    CGSize square = CGSizeMake(catCell.albumImage.bounds.size.width * retina, catCell.bounds.size.height * retina);

    [[PHImageManager defaultManager] requestImageForAsset:self.asset // <-- Right here
                                               targetSize:square  contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
        catCell.albumImage.image = result;
    }];

    return catCell;
}

这样做：

self.assets = [PHAsset fetchKeyAssetsInAssetCollection:self.assetCollection options:nil];

[[PHImageManager defaultManager] requestImageForAsset:self.assets[indexPath.row]
                                           targetSize:square contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
   catCell.albumImage.image = result;
}];

3） 最后，不要这样做：

PHFetchResult *fetchResult = [PHAsset fetchKeyAssetsInAssetCollection:self.assetCollection options:nil];
self.asset = [fetchResult firstObject];

[[PHImageManager defaultManager] requestImageForAsset:self.asset
                                           targetSize:square contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
   catCell.albumImage.image = result;
}];

这样做：

self.assets = [PHAsset fetchKeyAssetsInAssetCollection:self.assetCollection options:nil];

[[PHImageManager defaultManager] requestImageForAsset:self.assets[indexPath.row]
                                           targetSize:square contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
   catCell.albumImage.image = result;
}];

重述：

---

您一次又一次地为所有单元格获取相同的图像（

self.asset

）。因此，取而代之的是，为所有资产创建一个属性，并为正确的单元格获取正确的资产。

崩溃，我不知道为什么会发生什么样的崩溃..？愚蠢的错误。。。解决了的。。。打扰一下你的答案是正确的！。。谢谢你的支持！！！