iOS-显示来自“ALAssetLibrary”的图像`

我有

ViewController1

和

ViewController2

。

ViewController1

是

UICollectionView

，它使用

ASAssetLibrary

将缩略图加载到

UICollectionViewCell

：

NSMutableArray *collector = [[NSMutableArray alloc] initWithCapacity:0];
ALAssetsLibrary *al = [TemplateEditBarController defaultAssetsLibrary];
[al enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
                  usingBlock:^(ALAssetsGroup *group, BOOL *stop)
 {
     [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
      {
          if (asset) {
              [collector addObject:asset];
          }
      }];
     assetsarray = collector;//<--assetsarray is local.
 }
                failureBlock:^(NSError *error) { NSLog(@"fail!");}
 ];

我得到：

资产-library://asset/asset.JPG?id=6E5438ED-9A8C-4ED0-9DEA-AB2D8F8A9360&ext=JPG

我尝试更改为

[url路径]

我得到：

asset.JPG

---

如何获取实际的照片url，以便我可以转换为

NSString

以传递到

ViewController2

？

显然除了传递

ALAsset

之外，没有任何直接的解决方案。我就是这么做的：

NSURL* aURL = [NSURL URLWithString:imagePath];        
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:aURL resultBlock:^(ALAsset *asset)
     {
         UIImage  *image = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullScreenImage] scale:0.5 orientation:UIImageOrientationUp];             
         imageView.image=image;             

     }
            failureBlock:^(NSError *error)
     {
         // error handling
         NSLog(@"failure-----");
     }];

在

ViewController1

中，即

UICollectionViewController

，我具有以下功能：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
//NSLog(@"selected row: %ld",(long)indexPath.row);
long row = [indexPath row];
NSString* newbg = [[NSString alloc]init];
if ([bartype isEqualToString:@"photolibrary"]) {
    ALAsset* asset = backgroundsarray[row];
    [_delegate changeBackgroundWithAsset:asset];

}

然后我在

ViewController2

中有一个函数来处理

ALAsset

：

-(void)changeBackgroundWithAsset:(ALAsset*)b{
ALAssetRepresentation *rep = [b defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
UIImage *bimage;
bimage = [UIImage imageWithCGImage:iref];
UIImageView* bgview = [[UIImageView alloc]init];
bgview = curbgview;
bgview.image = bimage;

}我的解决方案如下：

ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
    if (asset) {
       image = [UIImage imageWithCGImage:[asset aspectRatioThumbnail]];
    }
}

---

查看URL，但我不知道为什么加载的图像的分辨率不是完整的。

ALAssetsLibrary *assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
    if (asset) {
       image = [UIImage imageWithCGImage:[asset aspectRatioThumbnail]];
    }
}