在ios中对字典数组进行排序答案

【问题标题】：Sort array of dictionaries in ios在ios中对字典数组进行排序
【发布时间】：2014-11-10 05:10:12
【问题描述】：

我有一个包含多个字典的数组。见下面的例子：

示例：

Main Array:

(
    {
        Title: "A";
        Value: 1;
        Priority: 
        (
            4  //Problem: contains array as value which need to be sorted
        );
    },
    {
        Title: "B";
        Value: 2;
        Priority: 
        (
            3 //Problem: contains array as value which need to be sorted
        );
    },
    {
        Title: "C";
        Value: 3;
    },
    {
        Title: "D";
        Value: 4;
        Priority: 
        (
        );
    },
    {
        Title: "E";
        Value: 5;
        Priority: null
    },
)

我需要根据字典中的“优先级”对主数组进行排序。优先级值是一个数组。

我怎样才能实现这种排序？

帮我解决这个问题...

提前致谢

【问题讨论】：

你的优先级是字符串还是数字？
@Rob，实际上我必须从 String 转换为 Integer 然后对它们进行排序。

标签： ios iphone arrays sorting dictionary

【解决方案1】：

您可以使用NSSortDescriptor

NSSortDescriptor *desc = [[NSSortDescriptor alloc] initWithKey:@"Title" ascending:YES];
[arr sortUsingDescriptors:[NSArray arrayWithObject:desc]];

或者其他选项可以是sortedArrayUsingComparator

[arr sortedArrayUsingComparator:^(NSDictionary *item1, NSDictionary *item2) {
    NSString *first = [item1 objectForKey:@"Title"];
    NSString *second = [item2 objectForKey:@"Title"];
    return [first compare:second options:NSLiteralSearch];
}];

【讨论】：

感谢回复...但我想按“优先级”排序。
你优先存储的内容
那么你的排序规则是什么？基于每个优先级数组中的最小值？最高的？平均值？
@Paulw11，感谢您的回复……首先是最高的意愿。
如果优先键包含单个值为什么你使用数组？

【解决方案2】：

试试这个。如果你需要相反的，那么只需改变 if-else 条件的顺序

[mainArray sortedArrayUsingComparator:^(NSDictionary *dic1, NSDictionary *dic2) {
    int priority1 = [[[dic1 objectForKey:@"Priority"] objectAtIndex:0] intValue];
    int priority2 = [[[dic2 objectForKey:@"Priority"] objectAtIndex:0] intValue];

    if(priority1 < priority2) return NSOrderedAscending;
    else if(priority1 > priority2) return NSOrderedDescending;
    else return NSOrderedSame;

}];

【讨论】：

【解决方案3】：

        NSArray *mainArray = @[
                       @{
                           @"Title":@"A",
                           @"value":@"1",
                           @"priority":@[[NSNumber numberWithInt:4]]
                        },

                       @{
                           @"Title":@"F",
                           @"value":@"1",
                           @"priority":@[[NSNumber numberWithInt:1]]
                        },

                       @{
                           @"Title":@"E",
                           @"value":@"1",
                           @"priority":@[]
                           },

                       @{
                           @"Title":@"C",
                           @"value":@"1",
                           @"priority":@[[NSNumber numberWithInt:3]]
                        },

                       @{
                           @"Title":@"D",
                           @"value":@"1",
                           @"priority":@[[NSNumber numberWithInt:5]]
                        },

                       @{
                           @"Title":@"B",
                           @"value":@"1",
                           @"priority":@[[NSNumber numberWithInt:2]]
                        },

                       @{
                           @"Title":@"E",
                           @"value":@"1",
                           @"priority":@[]
                        },

                       @{
                           @"Title":@"G",
                           @"value":@"1",
                           @"priority":[NSNull null]
                        }
                       ];



  NSArray *sortedArray =  [mainArray sortedArrayUsingComparator:^(NSDictionary *dic1, NSDictionary *dic2) {

        int priority1 = 0,priority2 = 0;

        if([[dic1 objectForKey:@"priority"] isKindOfClass:[NSArray class]]){
            NSArray *arr = (NSArray *)[dic1 objectForKey:@"priority"];
            if(arr.count != 0)
                priority1 = [[arr objectAtIndex:0] intValue];
        }

        if([[dic2 objectForKey:@"priority"] isKindOfClass:[NSArray class]]){
            NSArray *arr = (NSArray *)[dic2 objectForKey:@"priority"];
            if(arr.count != 0)
                priority2 = [[arr objectAtIndex:0] intValue];
        }

        if(priority1 > priority2) return NSOrderedAscending;
        else if(priority1 < priority2) return NSOrderedDescending;
        else return NSOrderedSame;

    }];



> The OutPut is in my LOG:
> 
> 2014-11-10 12:09:20.925 Sort Array[1624:591502] sorted array: (
>         {
>         Title = D;
>         priority =         (
>             5
>         );
>         value = 1;
>     },
>         {
>         Title = A;
>         priority =         (
>             4
>         );
>         value = 1;
>     },
>         {
>         Title = C;
>         priority =         (
>             3
>         );
>         value = 1;
>     },
>         {
>         Title = B;
>         priority =         (
>             2
>         );
>         value = 1;
>     },
>         {
>         Title = F;
>         priority =         (
>             1
>         );
>         value = 1;
>     },
>         {
>         Title = E;
>         priority =         (
>         );
>         value = 1;
>     },
>         {
>         Title = E;
>         priority =         (
>         );
>         value = 1;
>     },
>         {
>         Title = G;
>         priority = "<null>";
>         value = 1;
>     } )

【讨论】：

如果任何人的答案比我的答案更有效，请告诉我，我将不胜感激:)