No need to replace substrings in your string. You should use URLComponents to compose your URL. This way you don't have also to manually percent encode your string.
var components = URLComponents()
let scheme = "https"
let host = "urldomain.com"
let path = "/livestream_id/"
let sd = "1960*1080"
let deviceId = "myDeviceid"
let sdItem = URLQueryItem(name: "sd", value: sd)
let deviceIdItem = URLQueryItem(name: "device_id", value: deviceId)
components.scheme = scheme
components.host = host
components.path = path
components.queryItems = [sdItem, deviceIdItem]
if let url = components.url {
print(url.absoluteString) // https://urldomain.com/livestream_id/?sd=1960*1080&device_id=myDeviceid
}
To customize the final url you can check if your string contains a keyword and if true just append the query item to the components queryItem property. Something like:
let urlString = "urldomain.com/livestream_id/PLAYER_WIDTH&PLAYER_HEIGHT&IDFA_ID&DEVICE_ID"
components.queryItems = []
if urlString.contains("PLAYER_WIDTH&PLAYER_HEIGHT") {
components.queryItems?.append(sdItem)
}
if urlString.contains("DEVICE_ID") {
components.queryItems?.append(deviceIdItem)
}
