ios排序数组与字典 [英] ios sort array with dictionaries

问题描述

我有一个NSMutablearray，由字典[从JSON请求]填充

我需要组织数组，这取决于字典中的一个键

字典

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

所以数组由具有上述形式的不同字典组成，我需要最大程度地组织起来，最低限度

我看过这个答案，但是不明白为什么如此采用它，

非常感谢！

解决方案

  IdReward = 198; 
 Name =Online R d; 
 RewardImageUrl =/ FileStorimage = 1206; 
 WinRewardPoints = 250; 
 
 
 NSMutableArray * arr = [[NSMutableArray alloc] init];对于（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）; 
  

I have an NSMutablearray, populated by dictionaries [from a JSON request]

i need to organize the array depending to a key in the dictionaries

the dictionary

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

so the array is composed by different dictionaries with the above form, and I need to organize by maximum to minimum WinRewardPoints

I have seen this answer in SO, but dont understand yet how to adopt it for my case,

thanks a lot!

解决方案

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);

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