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in Technique[技术] by (71.8m points)

objective c - Anyway to get string from variable name?

Say I have my class

@interface Person : NSObject { NSString *name; }

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

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

Thanks for the answers, here's the solution I came up from the replies

//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;
}  
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1 Answer

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by (71.8m points)

As easy as

#define VariableName(arg) (@""#arg)

Then you do:

NSObject *obj;
NSString *str = VariableName(obj);
NSLog(@"STR %@", str);//obj

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