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我使用Moya Framework創建了以下函數。但是，如果請求失敗。我想重試該請求5次，然後顯示警報。達到此目的的最佳方法是什麼？重試請求5次並顯示錯誤消息
func checkToken() {
testProvider.request(.validateToken(Defaults[.accessToken], Defaults[.clientId], Defaults[.uId])) { result in
switch result {
case let .Success(response):
do {
try response.filterSuccessfulStatusCodes()
//Validate token
let storyBaord = UIStoryboard(name: "Main", bundle: nil)
let mainController = storyBaord.instantiateViewControllerWithIdentifier("TabBarController") as! TabBarController
self.navigationController?.pushViewController(mainController, animated: true)
}
catch {
//delete token and push to log in
Defaults.remove(.accessToken)
Defaults.remove(.clientId)
Defaults.remove(.uId)
self.performSegueWithIdentifier("PushToWelcomeScreen", sender: self)
}
case let .Failure(error):
//No internet connection/server error ->
}
}
}