如何将对象的NSArray排序为按字母顺序排列的NSDictionary？

-3

我有一个名为Receipt的自定义类。它有另一个类的属性，称为Retailer。 Retailer有另一个属性retailerName。我得到一个Receipt对象数组。我希望它被排序到一个NSDictionary，其键将是字母，值将是一个Receipt的数组，其对象的retailerName以字母开头，数组按字母顺序排序。如何将对象的NSArray排序为按字母顺序排列的NSDictionary？

我有什么：

[ 
    { 
    "retailerName": "Adidas", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Book My Show", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Albert-Heijn", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Amazon", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "BlackBerry", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Lambhorgini", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Lewis Outlet", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Boston Store", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    }, 
    { 
    "retailerName": "Lidl", 
    "totalCost": 392.1, 
    "purchasedOn": 1461218024549 
    } 
]

我从它需要什么：

{ 
    "A": [ 
      { 
       "retailerName": "Adidas", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Albert-Heijn", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Amazon", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      } 
      ], 
    "B": [ 
      { 
       "retailerName": "BlackBerry", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Book My Show", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Boston Store", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      } 
      ], 
    "L": [ 
      { 
       "retailerName": "Lambhorgini", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Lewis Outlet", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      }, 
      { 
       "retailerName": "Lidl", 
       "totalCost": 392.1, 
       "purchasedOn": 1461218024549 
      } 
      ] 
}

我知道的情况是有点复杂，但我已经尽了最大努力，学解释。如果需要，请求进一步解释。

在此先感谢。

来源

2015-06-05 Mayur Deshmukh

你有没有尝试过什么吗？你有没有任何代码，请分享 –

不可以。我没有什么可以分享的 –

如果您遇到任何问题，请自行首先尝试，然后张贴在这里。 –

我解决我的问题：

这里是我做过什么：

@implementation NSMutableDictionary (DictionaryForSectionIndex) 

+(NSMutableDictionary *)createDictionaryForSectionIndex:(NSArray *)array 
{ 
    NSMutableDictionary *dict = [NSMutableDictionary dictionary]; 
    for (char firstChar = 'a'; firstChar <= 'z'; firstChar++) 
    { 
     //NSPredicates are fast 
     NSString *firstCharacter = [NSString stringWithFormat:@"%c", firstChar]; 
     NSArray *content = [array filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"retailerName beginswith[cd] %@", firstCharacter]]; 
     NSMutableArray *mutableContent = [NSMutableArray arrayWithArray:content]; 

     if ([mutableContent count] > 0) 
     { 
      NSString *key = [firstCharacter uppercaseString]; 
      [dict setObject:mutableContent forKey:key]; 
     } 
    } 
    return dict; 
} 

@end

来源

2015-06-05 10:12:14

Array = [Array 
    sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) 
          { 
           NSNumber *number1 = [NSNumber 
           numberWithFloat:[someValue floatValue]]; 
          NSNumber *number2 = [NSNumber 
           numberWithFloat:[[somevalue floatValue]]; 

           return [number2 compare:number1]; 
         }];

你可以选择在字典中的特定键，并尝试排序它

来源

2015-06-05 07:29:56

如何将对象的NSArray排序为按字母顺序排列的NSDictionary？

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