Objective-c：NSString枚举 [英] Objective-c: NSString to enum

问题描述

所以，我有这个定义：

  typedef枚举{
 red = 1，
 blue = 2，
 white = 3 
} car_colors; 
  

然后，我有一个类型为car_colors的变量：
car_colors myCar; p>

问题是，我在NSString中收到汽车的颜色。它必须是NSString，我不能改变。如何将NSString转换为car_colors类型？

  NSString * value = [[NSString alloc] initWithString：@1] ; 
 myCar = [value intValue]; //<  - 不工作
  

任何想法？
谢谢！

解决方案

而不是使用数组，为什么不使用字典？你有颜色NSString作为键，你返回任何你想要的NSNumber。就像是; （为了清晰起见，长长的）。

  NSDictionary * carColourDictionary = @ {@Red：@ 1，
 @ 蓝：@ 2，
 @白：@ 3}; 
 
 //使用字典获取数字
 //假设您有一个方法可以将字符颜色返回为一个字符串：
 //  - （NSString *）colourAsString; 
 int carColour = carColourDictionary [object colourAsString]; 
  

So, I've got this definition:

typedef enum {
    red = 1,
    blue = 2,
    white = 3
} car_colors;

Then, I've got a variable of type car_colors: car_colors myCar;

The question is, I receive the color of the car in a NSString. It must be a NSString, I can't change that. How can I convert from NSString to car_colors type?

NSString *value = [[NSString alloc] initWithString:@"1"];
myCar = [value intValue]; // <-- doesn't work

any idea? thanks!

解决方案

Rather than use an array, why not use a dictionary; You have the colour NSString as keys, and you return whatever NSNumber you want. Something like; (Long winded for clarity).

NSDictionary *carColourDictionary = @{@"Red": @1,
                                      @"Blue": @2,
                                      @"White": @3};

// Use the dictionary to get the number
// Assume you have a method that returns the car colour as a string:
// - (NSString *)colourAsString;
int carColour = carColourDictionary[object colourAsString];

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