如何使用 ios 中的动态键对 NSMutableDictionary 进行排序？

Question

我正在关注字典作为 JSON 响应

Lease =     {
    "KINDERSLEY KERROBERT" =
    (
     {
         "lease_code" = 37;
     },
     {
         "lease_code" = 38;
     }
     );
    LLOYDMINSTER =
    (
     {
         "lease_code" = 68;
     },
     {
         "lease_code" = 69;
     }
     );
    "SOUTHEASTERN SASKATCHEWAN" =
    (
     {
         "lease_code" = 1;
     },
     {
         "lease_code" = 2;
     }
     );
    "SWIFT CURRENT" =
    (
     {
         "lease_code" = 32;
     },
     {
         "lease_code" = 33;
     }
     );
    };

我想排序如下：

 Lease =     {
"SOUTHEASTERN SASKATCHEWAN" =
(
 {
     "lease_code" = 1;
 },
 {
     "lease_code" = 2;
 }
 );
"SWIFT CURRENT" =
(
 {
     "lease_code" = 32;
 },
 {
     "lease_code" = 33;
 }
 );
"KINDERSLEY KERROBERT" =
(
 {
     "lease_code" = 37;
 },
 {
     "lease_code" = 38;
 }
 );
LLOYDMINSTER =
(
 {
     "lease_code" = 68;
 },
 {
     "lease_code" = 69;
 }
 );
};

我写了下面的代码来排序字典：

- (NSArray *)sortKeysByIntValue:(NSDictionary *)dictionary {

    NSArray *sortedKeys = [dictionary keysSortedByValueUsingComparator:^NSComparisonResult(NSArray *obj1, NSArray *obj2) {
        NSString* key1 = [[obj1 objectAtIndex:0] objectForKey:@"lease_code"];
        NSString* key2 = [[obj2 objectAtIndex:0] objectForKey:@"lease_code"];
        return [key1 compare:key2];
    }];
    return sortedKeys;
}

它给了我想要的 sortedKeys，但是在使用下面的代码重建 NSMutableDictionary 之后：

NSArray *sortedKeys = [self sortKeysByIntValue:dictionary];
NSMutableDictionary *sortedDictionary = [[NSMutableDictionary alloc] init];

for (NSString *key in sortedKeys) {
    [sortedDictionary setObject:dictionary[key] forKey:key];
}

它再次未排序，如响应中所示。

请帮帮我

Answer 1

NSArray *sortedKeys = [self sortKeysByIntValue:dictionary];
NSMutableArray* values = [NSMutableArray array];

for (NSString* key in sortedKeys)
{
   [values addObject:dictionary[key]];
}

现在您已经对键和值进行了排序。这正是您所需要的

Answer 2

字典总是未排序的。它们用作键值存储来查找数据。您应该将数据的顺序与字典分开。你需要你已经拥有的字典和一个排序的键数组。

@property NSDictionary *dataDict;
@property NSArray *sortedKeys;

self.sortedKeys = [self sortKeysByIntValue:self.dataDict];

在 UITableViewDataSource 方法中，您将首先使用索引查询数组，获取键，然后从字典中检索数据。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger row = [indexPath row];
    NSString *key = [self.sortedkeys objectAtIndex:row];
    NSObject *dataObject = [self.dataDict valueForKey:key];

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