ios - 如何将ui图像复制到另一个变量？

Question

我想将 uiimage 设置为函数范围之外的变量。我尝试了下面的代码，但它不起作用。下面的代码用于自定义 uitable View 单元格类。所以我不能分配和初始化它。因为这将导致每次显示/滚动单元格时对其进行初始化

 uiimage *img;
    [manager downloadWithURL:[NSURL URLWithString:friendData.picUrl] options:SDWebImageRefreshCached progress:^(NSInteger receivedSize, NSInteger expectedSize) {

    } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished) {

        img =image; ////this is not working !!



    }];


    dispatch_async(dispatch_get_main_queue(), ^{


        [cell.profileImage setImage:img];   //and off course this wont work too

    });

Answer 1

我认为你可能只需要设置__block UIImage image = nil;