在表視圖控制器中顯示之前對JSON響應進行排序-目標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";
        }
);

我檢索上面對變量的響應，並使用for循環顯示在TableViewController中

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];

當前輸出一次又一次顯示相同的餐廳ID。 我想如果有匹配的ID，則這些點需要計算總和。

34 - Total Points : 40

40 - Total Points : 60

34 - Total Points : 40 //

但是我想像下面這樣排序

34 - Total Points : 80 // 40 + 40

40 - Total Points : 60

Answer 1

使用NSSortDescriptor作為您的概念，

第1步

首先根據sort選擇鍵，對於我們取的Rewarded_Points ， ascending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);

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