获取私有变量名称

// 获取私有变量名称
+ (void)getIvars {
    
    unsigned int count = 0;
    
    Ivar *ivars = class_copyIvarList([self class], &count);
    
    for (int i = 0; i < count; i++) {
        Ivar ivar = ivars[i];
        
        NSLog(@"%s----%s", ivar_getName(ivar), ivar_getTypeEncoding(ivar));
    }
}