Enum int with string value in swift - swift

Question

I have enum of API endpoints which i use during the base url creation.
one of the API which has pagination is like pagination = "/api/pagination_test/%#?"
Now during pagination i want to pass value to enum initalizer and create an enum which will be accepted by the base-url creation function.
enum APIEndPoints{
case registerUser = "/register"
case login = "/login"
case getData = "/data?"
case pagination = "/api/pagination_test/%#?"
}
func callPaginationAPI(pagenumber: Int){
//make enum with pagenumber, i am stuck in this line.
//let enum =
//call main service method,pass enum as argument.
mainService(endPoint: .pagination)
// this expect an enum of pagination with proper pagenumber
}
func mainService(endpoint: APIEndpoints){
//create base url here
let url = requestUrl()
//do nsurlsession with prepared url
}
func requestUrl( endPoint: APIEndPoints) -> String {
let baseURL = self.requestBaseUrl()
return baseURL + endPoint.rawValue
}
How can i create a pagination enum with value one - am expecting enum as /api/pagination_test/1? , /api/pagination_test/2?

Answer 1

First of all the enum should be update so we can use String(format:)
enum APIEndPoints: String {
case registerUser = "/register"
case login = "/login"
case getData = "/data?"
case pagination = "/api/pagination_test/%d?"
}
To avoid having to pass the page number as a parameter through all methods it is probably better to wrap the enum inside a struct together with the (optional) page number and have a computed property that gets the endpoint as a string
struct EndPoint {
let apiEndPoint: APIEndPoints
let page: Int?
var endPointValue: String {
switch apiEndPoint {
case .pagination:
return String(format: apiEndPoint.rawValue, page ?? 1)
default:
return apiEndPoint.rawValue
}
}
init(_ endPoint: APIEndPoints, page: Int? = nil) {
apiEndPoint = endPoint
self.page = page
}
}
And then pass an instance of this struct instead
func callPaginationAPI(pagenumber: Int){
mainService(endpoint: EndPoint(.pagination, page: pagenumber))
}
And use the computed property when creating the url
func requestUrl(endPoint: EndPoint) -> String {
let baseURL = self.requestBaseUrl()
return baseURL + endPoint.endPointValue
}
And an example to use the struct without a page number
func callLoginAPI() {
mainService(endpoint: EndPoint(.login))
}