从相机胶卷创建 UIImages 数组

Question

我想从相机胶卷中获取所有图像并从中创建 UIImage 数组。

我已经尝试弄清楚如何做到这一点大约一天了，但我一无所获。我似乎不知道如何从相机胶卷中仅检索项目。看来我见过的所有样本都枚举了所有相册。不过我可能是错的。

任何帮助将不胜感激。谢谢！

Answer 1

您尝试过 ALAssetsLibrary 吗？就像这样：

assets = [[NSMutableArray array] init]; // Prepare array to have retrieved images by Assets Library.

void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *asset, NSUInteger index, BOOL *stop) {
    if(asset != NULL) {
        [assets addObject:asset]; 
        dispatch_async(dispatch_get_main_queue(), ^{
            [self insertArray];
        });
    }
};

void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) =  ^(ALAssetsGroup *group, BOOL *stop) {
    if(group != nil) {
        [group enumerateAssetsUsingBlock:assetEnumerator];
    }
};

// Create instance of the Assets Library.
library = [[ALAssetsLibrary alloc] init];

[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos // Retrieve the images saved in the Camera roll.
                       usingBlock:assetGroupEnumerator
                     failureBlock: ^(NSError *error) {
                         NSLog(@"Failed.");
                     }];    

那就抓住他们了。然后执行此操作来渲染它们（这是邪恶的黑客行为。您需要根据需要导入它们，而不是像这样一次性导入它们，否则您将遇到内存问题并崩溃）

-(void) insertArray {

int i = assetCount++;

if (i>20) {
    return;
}

ALAssetRepresentation *rep = [[assets objectAtIndex:i] defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
CGSize cSize = CGSizeMake(75,75);
UIImage *largeimage = [UIImage imageWithCGImage:iref];
UIImage *resizedimage = (UIImage *)[largeimage resizedImage:cSize interpolationQuality:kCGInterpolationHigh];
UIImageView *newView = [[UIImageView alloc] initWithImage:resizedimage];
if((i>0)&&(i%4 == 0)){
    rowCount++;
}

colCount = i%4;
newView.frame = CGRectMake(4+(colCount*(75+4)), 4+(rowCount*(75+4)), 75, 75);

[sv addSubview:newView];
[sv setContentSize:CGSizeMake(320, 85+(rowCount*(75+4)))];

NSLog(@"sv frame size is %@ and i is %i", NSStringFromCGRect(sv.frame), i);


}