添加到 NSMutableDictionary 而不替换相似的键

Question

我正在使用相同的键动态填充 NSMutableDictionary。但是，这样做会替换原始键值。我需要的是附加它而不是替换现有密钥。例如，我需要一个像

这样的结构

    {
      @"Key" : @"Value1",
      @"Key" : @"Value2",
      @"Key" : @"Value3"
    }

我知道我可以将创建的每个 NSDictionary 添加到 NSMutableArray，但我的问题来了，因为我需要输入值为 NSDictionary。

目前我有以下内容替换了原来的值

  NSMutableDictionary *ripDictionary = [[NSMutableDictionary alloc] init];

    for(NSString *ripId in recievedRips){

        //SOME OTHER CODE

        ripDictionary[@"rip"] = keysAndAttributes;

        [data addObject:ripDictionary];
    }

Answer 1

每个字典只能有一个唯一键，因此如果您想要多个值与之关联，那么您可以将这些值添加到与该键关联的数组中。

if([aDictionary objectForKey:@"key"] != nil){
  aDictionary[@"key"] = @[aDictionary[@"key"], bDictionary[@"key"]];
}else{
  aDictionary[@"key"] = bDictionary[@"key"];
  //OR make all aDictionary values array by default with a single value
  //but you get the point
}

Answer 2

来自NSDictionary Reference

A key-value pair within a dictionary is called an entry. Each entry consists of one object that represents the key and a second object that is that key’s value. Within a dictionary, the keys are unique. That is, no two keys in a single dictionary are equal (as determined by isEqual:).

也许您可以修改代码以接受如下字典：

{
      @"Key" : [
               @"Value1",
               @"Value2",
               @"Value3"
           ]
}

添加到 NSMutableDictionary 而不替换相似的键

Add to NSMutableDictionary without replacing similar keys

objective-c

nsmutabledictionary

ios