準備工作/生成一個Person類并定義一個屬性name

@property (nonatomic, copy) NSString* name;

控制器中初始化Person

- (void)viewDidLoad {
    [super viewDidLoad];
    self.persion = [[Persion alloc] init];
    self.persion.name = @"Runya";
    NSLog(@"%@", self.persion.name);
}

使用runtime改變實例成員的值

- (void) rylsj_changeVarName {
    /// 實例變量個數(shù)
    unsigned int count = 0;
    /// 獲取所有的實例變量
    Ivar* ivar = class_copyIvarList([self.persion class], &count);
    /// 遍歷
    for (int i = 0; i < count; i++) {
        /// 實例變量
        Ivar var = ivar[i];
        /// 實例變量名字
        const char * varName = ivar_getName(var);
        /// 轉換成OC語音形式的
        NSString* name = [NSString stringWithUTF8String:varName];
        if ([name isEqualToString:@"_name"]) {
            object_setIvar(self.persion, var, @"RunyaLsj");
            break;
        }
    }
}