Objective-C 如何呼叫enum做參數的方法？

Question

程式碼如下，ENUM已經定義在Account.h檔案裡面了

typedef NS_ENUM(NSUInteger, httpMethod){
    GET = 0,
    POST,
    PUT,
    DELETE
};
//方法定义
-(void) location:(httpMethod)httpMethod withLocation:(NSString *)location;

//在别的类里，调用方法，我想这么做，但是不知道正确的语法
[self.myAccount Account.httpMethod.PUT location: withLocation:location];

Answer 1

你這麼定義只能

[self.myAccount location:GET withLocation:location];

推薦把enum定義成如下：

typedef NS_ENUM(NSUInteger, HttpMethod) {
    HttpMethodGet,
    HttpMethodPost,
    HttpMethodPut,
    HttpMethodDelete,
}

[self.myAccount location:HttpMethodGet withLocation:location];

swift是可以做到你的要求的。

enum HttpMethod {
    case GET
    case POST
}

func a(m : HttpMethod, b : String) {
    // ...
}

a(.GET, "hello world")