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我使用了 avcapture 的演示示例，我想在拍照后在 viewcontroller 的 imagview 中显示图像我有使用代码

{
 ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
    NSInteger numberOfAssets = [group numberOfAssets];
    if (numberOfAssets > 0) {
        NSInteger lastIndex = numberOfAssets-1;
        [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:lastIndex] options:0   usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
            UIImage *thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
            if (thumbnail && thumbnail.size.width > 0) {
                imagviewlastimage.image = thumbnail;
                *stop = YES;
            }
        }];
    }
} failureBlock:^(NSError *error) {
    NSLog(@"error: %@", error);
}];

从照片库中获取最后一张图片，但我正在获取倒数第二张图片

并在选择我写过的图像后重定向 viewController

captureManagerStillImageCaptured:(AVCamCaptureManager *)captureManager delegate

ViewController *temp=[[ViewController alloc]init];

temp.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

[self presentModalViewController:temp animated:YES];

这么用，怎么解决？拍照后暂停屏幕

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