ボタンとアラートメッセージに最大値を設定する方法

Question

私は10のコーヒーポイントが蓄積された後（それぞれのコーヒーは2ポイントの価値がある）コーヒーアプリを持っています。

どのようにして最大コーヒーを注文したら10にし、10ポイントに達したときに警告メッセージをポップアップさせますか？

これは、オーダー・ビューのビュー・コントローラーです。何のコーヒーを注文されていないときに、エラーメッセージが発生しますが、私は、ユーザーが警告メッセージを作成するには10ポイント

import Foundation 
import UIKit 

class OrderingViewController: UIViewController { 

    var cstudent: Student = Student("name", "000") 
    var totalNumberOfCoffees = 0 
    var maximumNumberOfCoffee = 10 

    let minimumB = 0 
    let maximumA = 10 

    override func viewDidLoad() { 
     super.viewDidLoad() 
    } 

    @IBAction func cappaPressed(_ sender: Any) { 
     totalNumberOfCoffees += 2 
    } 

    @IBAction func flatwhitePressed(_ sender: Any) { 
     totalNumberOfCoffees += 2 
    } 

    @IBAction func mochaPressed(_ sender: Any) { 
     totalNumberOfCoffees += 2 
    } 

    @IBAction func esspresso(_ sender: Any) { 
     totalNumberOfCoffees += 2 
    } 


    @IBAction func placeOrderPressed(_ sender: Any) { 
    // by using this function, it makes the user know that they must order at least one 
    // coffee. if this were not here, it could waste the user's time as they 
    // may not be aware or may have made a mistake by not clicking on a coffee button. 

     if totalNumberOfCoffees > 0 { // you cannot order 0 coffees 
      performSegue(withIdentifier: "placeOrderSegue", sender: self) 
     } 
     displayAlertMessage(userMessage: "You cannot order no coffees!") 

     if minimumB >= maximumA { 
      totalNumberOfCoffees = maximumNumberOfCoffee 
     } 
     displayAlertMessage(userMessage: "FREE COFFEE") 
    } 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 

     if (segue.identifier == "placeOrderSegue"){ 
      let datasend = segue.destination as! AccountViewController 
      datasend.currentstudent = cstudent 
      // this passes the name of the student logged in, back to the 
      // AccountViewController. This is useful as if it were not here, the 
      // name of the user would be lost. 

      datasend.currentstudent.numOfCoffees += totalNumberOfCoffees 
      // add coffees bought to current student. this makes the 
      // student logged in know how many coffees they're oreder. 
     } 
    } 

    // alert message. 
    func displayAlertMessage (userMessage: String) { 
     let myAlert = UIAlertController(title: "Nothing has been ordered", message:userMessage, preferredStyle: UIAlertControllerStyle.alert) 

     let okAction = UIAlertAction(title: "ok", style: UIAlertActionStyle.default, handler: nil) 
     //the okAction is the button which is pressed by the users which lets them re-order on 
     // the same view controller (orderingViewController) 

     myAlert.addAction(okAction) 

     self.present(myAlert, animated: true, completion: nil) 
    } 

} 

Answer 1

1. に達したときにポップアップ10点を持っているときにポップアップ別の警告メッセージを作成しようとしています達しました。

簡単な答えは、蓄積ポイントを格納する変数をtotalNumberOfCoffeesが10

@IBAction func cappaPressed(_ sender: Any) { 
    totalNumberOfCoffees += 2 
    checkReach() 
} 

@IBAction func flatwhitePressed(_ sender: Any) { 
    totalNumberOfCoffees += 2 
    checkReach() 
} 

@IBAction func mochaPressed(_ sender: Any) { 
    totalNumberOfCoffees += 2 
    checkReach() 
} 

@IBAction func esspresso(_ sender: Any) { 
    totalNumberOfCoffees += 2 
    checkReach() 
} 

func checkReach() { 
    if totalNumberOfCoffees >= 10 { 
     displayAlertMessage (userMessage: "REACHED") 
     totalNumberOfCoffees = 10 
    } 
}