1

可能重复：
JSONkit 排序问题

我有以下json

[
  {
    "Pending": 67,
    "Past Due": 63,
    "Invites": 0
  },
  {
    "Reading Approval": 4,
    "Schedule Approval": 16,
    "Session Assignment": 1
  },
  {
    "Reading Approval": 3,
    "Schedule Approval": 20,
    "Class Approval": 20,
    "Module Approval": 2,
    "Training Plan Review": 2,
    "Job Confirmation": 1
  }

]

当我将 json 字符串分配给 nsarray 时，字典中的值会按字母顺序排序。

NSArray *arr = [strResult JSONValue];

如何保持与 json 字符串相同的顺序？

arr = 
{
  Invites = 0;
  "Past Due" = 63;
  Pending = 67;
},
{
  "Reading Approval" = 4;
  "Schedule Approval" = 16;
  "Session Assignment" = 1;
},
{
  "Class Approval" = 20;
  "Job Confirmation" = 1;
  "Module Approval" = 2;
  "Reading Approval" = 3;
  "Schedule Approval" = 20;
  "Training Plan Review" = 2;
}
)

这是我要显示的表格：

Group 1
  Pending    67
  Past Due   63
  Invites    0

Group 2
  Reading Approval    4
  Schedule Approval   16
  Session Assignment  1

Group 3
  Reading Approval      3
  Schedule Approval     20
  Class Approval        20
  Module Approval       2
  Training Plan Review  2
  Job Confirmation      1
4

3 回答 3

2

使用标准 JSON 解析器，您将需要更改数据。

[
  [
    { "Pending": 67 },
    { "Past Due": 63 },
    { "Invites": 0 }
  ],
  [
    { "Reading Approval": 4 },
    { "Schedule Approval": 16 },
    { "Session Assignment": 1 }
  ],
  [
    { "Reading Approval": 3 },
    { "Schedule Approval": 20 },
    { "Class Approval": 20 },
    { "Module Approval": 2 },
    { "Training Plan Review": 2 },
    { "Job Confirmation": 1 }
  ]
]

假设您可以更改 JSON 格式。

如何访问数据。假设您有节数组并且知道节和行索引。

NSArray *sections = ...
NSUInteger sectionIndex = ...
NSUInteger rowIndex = ...

NSArray *rows = [sections objectAtIndex:sectionIndex];
NSDictionary *cell = [rows objectAtIndex:rowIndex];

NSString *name = [[cell allKeys] objectAtIndex:0];
NSNumber *value = [cell objectForKey:name];

// What ever you need to do

如果要遍历所有数据

NSArray *sections = ...

for (NSArray *rows in sections) {
    for (NSDictionary *cell in rows) {
        NSString *name = [[cell allKeys] objectAtIndex:0];
        NSNumber *value = [cell objectForKey:name];

        // What ever you need to do
    }
}
于 2012-05-29T14:33:07.380 回答
1

NSDictionary是一个无序的容器对象。如果它被打印出来，它会按字母顺序排序。但是没有保证的顺序。

文档description:说：

If each key in the dictionary is an NSString object, the entries are listed in ascending order by key, otherwise the order in which the entries are listed is undefined. [...]

allKeys:说：

The order of the elements in the array is not defined.

并且allValues还说：

The order of the elements in the array is not defined.

但是NSArray是一个有序的容器。这就是 Jeffery Thomas 声明您应该为每个 JSON 条目使用数组的原因。

但是您也可以尝试使用 smth ，例如：

[
  [
    "keys": {"Pending","Past Due","Invites"},
    "values": {67,63,0}
  ],
  [
    "keys": {"Reading Approval","Schedule Approval","Session Assignment"},
    "values": {4,16,1},
  ],
  [
    "keys": {"Reading Approval","Schedule Approval","Class Approval",...},
    "values": {3,20,20,...},
  ]
]
于 2012-05-29T15:21:43.427 回答
0

字典没有订购它的项目。排序由 iOS 完成，只是为了很好地显示它。但是，您永远不应该假设字典中的项目有任何顺序。

于 2012-05-29T15:14:09.430 回答