如何在Objective-C中列出对象的所有字段？ [英] How do I list all fields of an object in Objective-C?

问题描述

如果我有一个类，如何列出其所有的实例变量名称？

例如：

  @interface MyClass：NSObject {
 int myInt; 
 NSString * myString; 
 NSMutableArray * myArray 
} 
  

我想获得myInt，myString和myArray 。有没有办法可能得到一个名字数组，我可以迭代？

我试过搜索Objective-C文档但找不到任何东西（我也不确定是什么）。

$如上所述，您可以使用Objective-C运行时API来检索实例变量名称：

$ b b

  unsigned int varCount; 
 
 Ivar * vars = class_copyIvarList（[MyClass class]，& varCount）; 
 
 for（int i = 0; i  Ivar var = vars [i]; 
 
 const char * name = ivar_getName（var）; 
 const char * typeEncoding = ivar_getTypeEncoding（var）; 
 
 //做你想要的名字和类型
} 
 
 free（vars）; 
  

If I have a class, how can I list all its instance variable names?

eg:

@interface MyClass : NSObject {
    int myInt;
    NSString* myString;
    NSMutableArray* myArray;
}

I would like to get "myInt", "myString", and "myArray". Is there some way to perhaps get an array of names that I can iterate over?

I've tried searching the Objective-C documentation but couldn't find anything (and I'm not sure what this is called either).

解决方案

As mentioned, you can use the Objective-C runtime API to retrieve the instance variable names:

unsigned int varCount;

Ivar *vars = class_copyIvarList([MyClass class], &varCount);

for (int i = 0; i < varCount; i++) {
    Ivar var = vars[i];

    const char* name = ivar_getName(var);
    const char* typeEncoding = ivar_getTypeEncoding(var);

    // do what you wish with the name and type here
}

free(vars);

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