简单自定义一个枚举类

枚举对于小白来说，都是比较难写的，虽然平时用的比较多，但真正要自己写个枚举，相信大家都会皱起眉头吧，今天我就给大家简单实现下枚举类，整个过程十分简单
关键代码
typedef NS_ENUM(,){

};
NS_ENUM(,)是系统给我们的一个自定义枚举类，第一个参数就是一个无符号的长整型，第二个参数就是我们定义的枚举类

typedef NS_ENUM(NSUInteger,XWPushPopPresentDismissTransitionType){
    XWPushPopPresentDismissTransitionTypePush = 0,
    XWPushPopPresentDismissTransitionTypePop,
    XWPushPopPresentDismissTransitionTypePresent,
    XWPushPopPresentDismissTransitionTypeDismiss
};

这是我参照简友写的一个页面转换枚举
然后我们声明两个初始化方法

+ (instancetype)transitionWithType:(XWPushPopPresentDismissTransitionType)type;

- (instancetype)initWithTransitionType:(XWPushPopPresentDismissTransitionType)type;

然后在.m中实现下
首先在延展中设定一个type，方便之后在方法中调用

@property (nonatomic,assign) XWPushPopPresentDismissTransitionType type;

+ (instancetype)transitionWithType:(XWPushPopPresentDismissTransitionType)type
{
    return [[self alloc] initWithTransitionType:type];
}

- (instancetype)initWithTransitionType:(XWPushPopPresentDismissTransitionType)type
{
    self = [super init];
    if (self) {
        _type = type;
    }
    return self;
}

这样所有准备工作就完成了，之后就是在需要进行方法枚举的地方，用swich方法进行调用

switch (_type) {
        case XWPushPopPresentDismissTransitionTypePush:
            //方法1
            [self pushAnimation:transitionContext];
            break;
        case XWPushPopPresentDismissTransitionTypePop:
            //方法2
            [self popAnimation:transitionContext];
            break;
        case XWPushPopPresentDismissTransitionTypePresent:
            //方法3
            [self presentAnimation:transitionContext];
            break;
        case XWPushPopPresentDismissTransitionTypeDismiss:
            //方法4
            [self dismissAnimation:transitionContext];
            break;
    }

一个简单的枚举就做完了。