NSDictionary Objective-C [英] NSDictionary Objective-C

问题描述

键对象

我尝试以下列方式存储数据，以字符串为键，我想要一个数组作为值。 >

字母{'a'，'b'，'c'，'d'}

numbers{1,2,3,4 ，5,6,7}

在代码中 NSDictionary 如果是这样，怎么样？我真的很困惑这个。

解决方案

在代码中做一个简单的方法可以这样做）：

  NSMutableDictionary * dict = [NSMutableDictionary dictionary]; 
 [dict setObject：[NSArray arrayWithObjects：@a，@b，@c，@d，nil] forKey：@letters 
 [dict setObject：[NSArray arrayWithObjects：[NSNumber numberWithInt：1]，[NSNumber numberWithInt：2]，[NSNumber numberWithInt：3]，[NSNumber numberWithInt：4]，nil] forKey：@numbers]; 
  

这会创建一个 NSDictionary 字符串和 NSNumber 对象的数组，还有其他方法来创建数组，但它演示了一个基本的方法。

根据以下注释：

如果您想一次添加一个项目到数组...

  //创建字典并添加字母和数字mutable arrays 
 NSMutableDictionary * dict = [NSMutableDictionary dictionary]; 
 NSMutableArray * letters = [NSMutableArray array]; 
 NSMutableArray * numbers = [NSMutableArray array]; 
 [dict setObject：letters forKey：@letters]; 
 [dict setObject：numbers forKey：@numbers]; 
 
 //添加一个字母并添加一个数字
 [[dict objectForKey：@letters] addObject：@a]; 
 [[dict objectForKey：@numbers] addObject：[NSNumber numberWithInt：1]]; 
 //现在有一个NSDictionary（hash），有两个数组，一个字母和一个数字
 //，字母数组中的字母'a'和
中的数字1 //数字数组
  

I'm trying to store data in the following fashion with a string as the key and I would like an array as the value.

key objects

"letters" {'a','b','c','d'}
"numbers" {1,2,3,4,5,6,7}

Is this possible with NSDictionary in code? If so how would that look like? I'm really confused on this.

解决方案

A simple way to do this in code (and just one of many several ways you could do it):

NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:[NSArray arrayWithObjects:@"a", @"b", @"c", @"d", nil] forKey:@"letters"];
[dict setObject:[NSArray arrayWithObjects:[NSNumber numberWithInt:1], [NSNumber numberWithInt:2], [NSNumber numberWithInt:3], [NSNumber numberWithInt:4], nil] forKey:@"numbers"];

That creates an NSDictionary with an array of strings and an array of NSNumber objects, there are other ways to create arrays, but that demonstrates a basic way to do it.

Per the comments below:

If you wanted to add items to the arrays one at a time...

  // create the dictionary and add the letters and numbers mutable arrays
  NSMutableDictionary *dict = [NSMutableDictionary dictionary];
  NSMutableArray *letters = [NSMutableArray array];
  NSMutableArray *numbers = [NSMutableArray array];
  [dict setObject:letters forKey:@"letters"];
  [dict setObject:numbers forKey:@"numbers"];

  // add a letter and add a number
  [[dict objectForKey:@"letters"] addObject:@"a"];
  [[dict objectForKey:@"numbers"] addObject:[NSNumber numberWithInt:1]];  
  // This now has an NSDictionary (hash) with two arrays, one of letters and one 
  // of numbers with the letter 'a' in the letters array and the number 1 in 
  // the numbers array

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