如何排序UIImage在ios中以降序添加NSMutableArray(How to sort UIImage added NSMutableArray in ios in descending)

 我正在为存储到NSMutableArray的UIImage工作。 我如何使用UIImage对其进行排序，因为它不存储任何参数或for-key，我可以使用任何比较器代码对其进行排序。 
 
 我正在努力从图像选择器控制器存储UIImage。 将数量的图像存储到NSMutableArray之后。 之后，我需要将My mutable排序为Last In First out（LIFO）。 它目前以先进先出（FIFO）或降序运行。 我们将图像存储到数组如下： 
 
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[info count]];

    for (NSDictionary *dict in info) {

        UIImage *image = [dict objectForKey:UIImagePickerControllerOriginalImage];
        [images addObject:image];

    }


    [_currentData addObjectsFromArray:images];
 
 存储后我无法将上次添加的对象排序为图像视图中的第一个显示。 以下代码崩溃对我来说： 
 
NSSortDescriptor *desc = [NSSortDescriptor sortDescriptorWithKey:@"" ascending:NO];
    [_currentData sortUsingDescriptors:@[desc]];
 
 我的_currentData是主要的NSMutableArray，我用它在短路后显示在表视图中。 
 
 请帮助我排序UIImage存储的NSMutableArray为LAST IN FIRST OUT（LIFO）降序。 

I am working for UIImage storing to NSMutableArray. How i can sort it with the UIImage because it's not storing any parameter or for-key by which i can sort using any comparator code.
 
I am working to store UIImage from image picker controller. After storing numbers of images to NSMutableArray. After that i need to sort My mutable to Last In First out(LIFO). It's currently working as First In First Out(FIFO) or descending. We are storing images to array as follow:
 
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[info count]];

    for (NSDictionary *dict in info) {

        UIImage *image = [dict objectForKey:UIImagePickerControllerOriginalImage];
        [images addObject:image];

    }


    [_currentData addObjectsFromArray:images];
 
After Storing i am not able to Sort Last added object to First display in image view. Following code Crashes for me:
 
NSSortDescriptor *desc = [NSSortDescriptor sortDescriptorWithKey:@"" ascending:NO];
    [_currentData sortUsingDescriptors:@[desc]];
 
My _currentData is main NSMutableArray which i am using to display in the table view after shorting.
 
Please help me For sorting UIImage stored NSMutableArray for LAST IN FIRST OUT(LIFO) descending order.

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