lesson5

gistfile1.swift

//
//  ViewController.swift
//  Problem_part5
//
//  Created by 久保田 将規 on 2015/03/12.
//  Copyright (c) 2015年 masaki.k. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var textField1: UITextField!
    @IBOutlet weak var textField2: UITextField!
    @IBOutlet weak var resultLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func calcButton(sender: AnyObject) {
        //入力
        let text1 = self.textField1.text
        let text2 = self.textField2.text
        
        //バリデーション
        if let error = validationValue(text1, text2: text2) {
            showAlertWithContent(error)
            return
        }
        let doubleVal1 = (text1 as NSString).doubleValue
        let doubleVal2 = (text2 as NSString).doubleValue
        let answer = doubleVal1 / doubleVal2
        
        self.resultLabel.text = "\(answer)"
    }
    
    //バリデーションチェック
    func validationValue(text1:String, text2:String) -> String?{
        if text1.isEmpty {
            return "割られる数を入力してください"
        } else if text2.isEmpty{
            return "割る数を入力してください"
        } else if text2 == "0" {
            return "割る数には0を入力しないでください"
        } else {
            return nil
        }
    }
    
    
    //アラート表示
    func showAlertWithContent( content : String){
        let alert = UIAlertController(title: "課題5", message: content, preferredStyle: .Alert)
        let ok = UIAlertAction(title: "ok", style: .Default, handler: nil)
        alert.addAction(ok)
        presentViewController(alert, animated: true, completion: nil)
        
    }

}