ios - 在 TableView Controller 中显示之前对 JSON 响应进行排序 - Objective C

Question

Rewards =     (
                {
            "Restaurant_ID" = 34;
            "Rewarded_Points" = 40;
            "Rewarded_Time" = "2015-11-23 09:16:00";
        },

           {
            "Restaurant_ID" = 40;
            "Rewarded_Points" = 60;
            "Rewarded_Time" = "2015-11-24 12:22:56";
          },
            {
            "Restaurant_ID" = 34;
            "Rewarded_Points" = 40;
            "Rewarded_Time" = "2015-11-24 12:22:56";
        }
);

我正在检索以上对变量的响应并使用 for 循环在 TableViewController 中显示

for(int i=0;i<rewards.count;i++){
        NSDictionary * rewardsObj = [rewards objectAtIndex:i];
        restId = [rewardsObj objectForKey:@"Restaurant_ID"];
        rewardedPoints = [rewardsObj objectForKey:@"Rewarded_Points"];
}
[self.tableView reloadData];

当前输出一次又一次地显示相同的餐厅 ID。我想如果有匹配的 ID，那么这些点需要计算总和。

34 ​​- 总分:40

40 - 总分:60

34 ​​- 总分:40//再次

但我想像下面这样排序

34 ​​- 总分:80//40+40

40 - 总分:60

Answer 1

为您的概念使用 NSSortDescriptor，

步骤-1

最初根据排序选择键，对于我们取的ex Rewarded_Points，并按升序顺序排序。

NSSortDescriptor * Rewarded_Points =
[[NSSortDescriptor alloc] initWithKey:@"Rewarded_Points"
                           ascending:YES];
NSArray *descriptors = [NSArray arrayWithObjects:Rewarded_Points, nil];

 NSArray *sortedArrayOfDictionaries = [Rewards sortedArrayUsingDescriptors:descriptors]; // Rewards -> array of dictionary name

NSLog(@"final Value : %@", sortedArrayOfDictionaries);

额外Tutorial