objective-c - 初始化枚举值时出错

Question

下面是我在 Ball 类的头文件中创建的枚举:

typedef enum   {
redBall = 0,
blueBall = 1,
greenBall = 2

}ballTypes;

在界面中:

ballTypes ballType;

在Ball.mm的init方法中我初始化了ballType如下:

ballType = 0;

我收到以下错误:

Assigning to 'ballTypes' from incompatible type 'int'

我该如何解决这个问题？

Answer 1

枚举应该用 NS_ENUM 宏定义:

typedef NS_ENUM(NSInteger, BallType) {
    BallTypeNone  = 0,
    BallTypeRed   = 1,
    BallTypeBlue  = 2,
    BallTypeGreen = 3
};

BallType ballType;

ballType = BallTypeNone;

通常，名称以大写字母开头，每个值都是附加了有意义描述的名称。