将字典数组拆分为子数组

Question

下面是我的 JSON 回复的一部分，其中“results”是一个字典数组：

{
  "results": [
    {
      "id": 6,
      "genre_name": "Action",
      "cover_image": "http://54.254.204.81/images/Action.png"
    },
    {
      "id": 5,
      "genre_name": "Adventure",
      "cover_image": "http://54.254.204.81/images/Adventure.png"
    },
    {
      "id": 4,
      "genre_name": "Romance",
      "cover_image": "http://54.254.204.81/images/Romance.png"
    },
    {
      "id": 3,
      "genre_name": "Sci-Fci",
      "cover_image": "http://54.254.204.81/images/Sci-Fi.png"
    },
    {
      "id": 1,
      "genre_name": "Guide",
      "cover_image": "http://54.254.204.81/images/Adventure_XHLbNfN.png"
    },
    {
      "id": 2,
      "genre_name": "Horror",
      "cover_image": "http://54.254.204.81/images/Phineas-and-Ferb-Christmas-Wallpaper.jpg"
    },
    {
      "id": 7,
      "genre_name": "Emotional",
      "cover_image": "http://54.254.204.81/images/a0fea991287cf41b6b9c4aa16196517f.jpg"
    },
    {
      "id": 8,
      "genre_name": "abcd",
      "cover_image": "http://54.254.204.81/images/logo_text_S0KyzUW.png"
    }
  ]
}

现在我有另一个 JSON 响应，其中“genres”是一个数组，其中包含的对象是具有键 'id' 的“results”数组对象的子集。

{
  "genres": [
    3,
    1
  ]
}

现在，我是否可以将“results”拆分为两个数组“results1”和“results2”，例如：

{
  "results1": [
    {
      "id": 6,
      "genre_name": "Action",
      "cover_image": "http://54.254.204.81/images/Action.png"
    },
    {
      "id": 5,
      "genre_name": "Adventure",
      "cover_image": "http://54.254.204.81/images/Adventure.png"
    },
    {
      "id": 4,
      "genre_name": "Romance",
      "cover_image": "http://54.254.204.81/images/Romance.png"
    },
    {
      "id": 2,
      "genre_name": "Horror",
      "cover_image": "http://54.254.204.81/images/Phineas-and-Ferb-Christmas-Wallpaper.jpg"
    },
    {
      "id": 7,
      "genre_name": "Emotional",
      "cover_image": "http://54.254.204.81/images/a0fea991287cf41b6b9c4aa16196517f.jpg"
    },
    {
      "id": 8,
      "genre_name": "abcd",
      "cover_image": "http://54.254.204.81/images/logo_text_S0KyzUW.png"
    }
  ]
}

和

{
  "results2": [
    {
      "id": 3,
      "genre_name": "Sci-Fci",
      "cover_image": "http://54.254.204.81/images/Sci-Fi.png"
    },
    {
      "id": 1,
      "genre_name": "Guide",
      "cover_image": "http://54.254.204.81/images/Adventure_XHLbNfN.png"
    }
  ]
}

Answer 1

为此，您需要像这样将 NSPredicate 与 IN 和 NOT 一起使用。

首先根据您的两个 JSON 回复创建 resultArray 和 genresArray。

NSArray *resultArray = [firstJSONResponse objectForKey:@"results"];
NSArray *genresArray = [secondJSONResponse objectForKey:@"genres"];

现在使用 NSPredicate 过滤 resultArray 以获得结果。

对于结果 1

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"NOT (id IN %@)",genresArray];
NSArray *firstSplitArray = [resultArray filteredArrayUsingPredicate:predicate];
NSLog(@"%@",firstSplitArray);

对于结果 2

predicate = [NSPredicate predicateWithFormat:@"id IN %@",genresArray];
NSArray *secondSplitArray = [resultArray filteredArrayUsingPredicate:predicate];
NSLog(@"%@",secondSplitArray);

Answer 2

喜欢以下方式：

    NSMutableArray * genresArray = [NSMutableArray new];

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"NOT (id IN %@)", genresArray];
    NSArray *filterArray = [Yourarray filteredArrayUsingPredicate:predicate];
    NSLog(@"filter:  %@",filterArray);

Answer 3

针对以上场景试试这个：

NSDictionary *yourJson;
NSMutableArray *array1 = [[yourJson valueForKey:@"results"] mutableCopy];
NSMutableArray *array2 = [[yourJson valueForKey:@"results2"] mutableCopy];

for(int i =0 ; i<array2.count ; i++)
{
    NSString *objectFromarray2 = [array2 objectAtIndex:i];
    for(int j =0 ; j<array1.count ; j++)
    {
        NSDictionary *objectFromarray1 = [array2 objectAtIndex:i];
        if([[objectFromarray1 valueForKey:@"id"] isEqualToString:objectFromarray2])
        {
            [array2 removeObjectAtIndex:i];
            [array2 insertObject:objectFromarray1 atIndex:i];
            [array1 removeObject:objectFromarray1];
        }

    }

}

Answer 4

是的，您可以使用 NSPredicate 来做到这一点，但为此您首先必须将所有字典对象存储到一个 NSArray 或 NSMutableArray 中，无论什么适合您的要求。

Answer 5

喜欢：

NSString *search1 = @"3";
NSString *search2 = @"1";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(ANY SELF == %@) OR (ANY SELF == %@)", search1,search2];
NSArray *filtered = [Yourarray filteredArrayUsingPredicate:predicate];

Answer 6

Swift 中的一种方法 - 3 使用过滤器和映射

let resultArray = results["results"]!

let genArray = genres["genres"]!

var result1Array : [[String:Any]] = resultArray
var result2Array : [[String:Any]] = []

for gen in genArray {

    if let elm = resultArray.filter({ [=10=]["id"] as! Int == gen }).first {
        result2Array.append(elm)
        result1Array = result1Array.filter({ [=10=]["id"] as! Int != elm["id"] as! Int })
    }

}

print(["result2":result2Array])
print("\n")
print(["result1":result1Array])

将字典数组拆分为子数组

Split array of dictionaries into sub-arrays

objective-c

nsmutablearray

nsmutabledictionary

ios