无论如何要从变量名中获取字符串? [英] Anyway to get string from variable name?

问题描述

说我要上课

@interface Person : NSObject { NSString *name; }

我需要在我的课程中获取NSString的名称

I need to get the name of NSString's within my class

Person *person = [[Person alloc] init];
NSLog(@"Name of variable %s\n", _NameofVariable_(person->name));

感谢您的回答，这是我从答复中得出的解决方案

//returns nil if property is not found
-(NSString *)propertyName:(id)property {  
    unsigned int numIvars = 0;
    NSString *key=nil;
    Ivar * ivars = class_copyIvarList([self class], &numIvars);
    for(int i = 0; i < numIvars; i++) {
        Ivar thisIvar = ivars[i];
        if ((object_getIvar(self, thisIvar) == property)) {
            key = [NSString stringWithUTF8String:ivar_getName(thisIvar)];
            break;
        }
    } 
    free(ivars);
    return key;
}  

推荐答案

您可以使用

You can get the names of a class's instance variables with the Objective-C runtime API function class_copyIvarList. However, this is rather involved, rarely done and almost never the best way to accomplish something. If you have a more specific goal in mind than mere curiosity, it might be a good idea to ask about how to accomplish it in Objective-C.

另外，person.name并没有在Objective-C中指定实例变量-这是一个属性调用.实例变量将为person->name.

Also, incidentally, person.name doesn't specify an instance variable in Objective-C — it's a property call. The instance variable would be person->name.

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