ios - 消息 : "Fail! Play Again" does not display when score < 3

Question

我是 iOS-Swift 的新手，在 score < 3 时不显示消息:“失败!再玩一次” .

func discussScore(sender: AnyObject){       
  // after asking all questions, if score >=20, the player accesses stage 2
    if (questionField.text == listOfQuestions[4]) {
          if (score >= 3) {
              //go to next step
          }

          if (score < 3) {
              alertMessageWrong("Fail! Play Again") // (here's my problem)
          }                    
     }
}

func alertMessageWrong(theMessage2: String) {

    let alertController = UIAlertController(title: " ", message:theMessage2, preferredStyle: UIAlertControllerStyle.Alert)
    alertController.view.tintColor = UIColor.redColor()
    alertController.addAction(UIAlertAction(title:theMessage2, style: UIAlertActionStyle.Default,handler: nil))
    self.presentViewController(alertController, animated: true, completion: nil)

}

Answer 1

首先，我会在这一行放置一个断点:

if (questionField.text == listOfQuestions[4])

并逐步查看每一行以查看采用了哪条路线...您可以了解如何调试 here .

要检查您是否回答了正确的问题，最好使用“步长”整数而不是比较字符串。在回答每个问题后增加此整数。然后你可以检查你是否在做最后一个问题:

if currentStep >= listOfQuestions.count { ... }

其次，如果您这样做，代码会更简洁:

let minimumScore = 3
if score < minimumScore { 
    showAlert()
    return
}
// go to next step.