コード内のテキストをUILabelに割り当てます！ Swift 2.2

Question

iOS 8/Swift 1のチュートリアルを使用して、Xcode 7.3/Swift 2.2を使用して、ラベルにテキストを割り当てるためのサンプルアプリケーションを作成します。前もって感謝します。

import UIKit 

class ViewController: UIViewController { 

    @IBOutlet var ageCat: UITextField! 

    @IBOutlet var resultAge: UILabel! 

    @IBAction func findAgeButton(sender: AnyObject) { 

     var enteredAge = Int(ageCat.text!) 

     var catYears = enteredAge! * 7 

     resultAge = "Your cat is \(catYears) in cat years" 

    } 
} 

Answer 1

以下でごIBAction FUNC findAgeButtonを交換してください：

@IBAction func findAgeButton(sender: AnyObject) { 

// Here the variable is unwrapped. This means the code after it is not executed unless the program is sure that it contains a value. 
if let text = ageCat.text { 
    // You can use the unwrapped variable now and won't have to place an exclamation mark behind it to force unwrap it. 
    let enteredAge = Int(text) 
    if let age = enteredAge { 
     let catYears = age * 7 
     resultAge.text = "Your cat is \(catYears) in cat years" 
    } 
    } 
} 

Answer 2

あなたはresultAge.text代わりのresultAgeに値を代入する必要があります。すべての役に立つ入力用

resultAge.text = "Your cat is \(catYears) in cat years"  

Answer 3

感謝を。これが私の仕事：

@IBAction func findAgeButton(sender: AnyObject) { 

    var catYears = Int(ageCat.text!)! 

    catYears = catYears * 7 

    resultAge.text = "Your cat is \(catYears) in cat years" 

    } 

を私もエントリーnilを対処する場合/他の追加：

if Int(ageCat.text!) != nil { 

    // --insert last 3 lines of code from above here-- 

    } else { 

    resultAge.text = "Please enter a number" 

}