ios - 带字典的ios排序数组

我有一个NSMutablearray，由字典填充(来自JSON请求)

我需要根据字典中的键来组织数组

词典

IdReward = 198;
Name = "Online R d";
RewardImageUrl = "/FileStorimage=1206";
WinRewardPoints = 250;

因此数组由具有以上形式的不同字典组成，我需要按最大到最小个WinRewardPoints进行组织

我在SO中看过this answer，但还不了解如何针对我的情况采用它，

非常感谢!

最佳答案

IdReward = 198;
Name = "Online R d";
RewardImageUrl = "/FileStorimage=1206";
WinRewardPoints = 250;


NSMutableArray *arr = [[NSMutableArray alloc]init];

for (int i=0; i<[dict count]; i++) {
    [arr addObject:[dict valueForKey:@"WinRewardPoints"]];
}

NSSortDescriptor *sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:nil ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
arr = [[arr sortedArrayUsingDescriptors:sortDescriptors] copy];


NSMutableArray *final_arr = [[NSMutableArray alloc]init];
for(NSString* str in arr)<p>
{
    for(int i=0 ; i<[dict count]; i++)
    {
            <t>if ([str isEqualToString:[[dict valueForKey:@"WinRewardPoints"]objectAtIndex:i]])
                            {

                [final_arr addObject:[dict objectAtIndex:i]];
            }
    }

}

NSLog(@"%@",final_arr);