ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var timerLabel: UILabel!
    var startTime: TimeInterval? = nil
    var timer = Timer()
    var elapsedTime: Double = 0.0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    setButtonEnabled(start: true, stop: flase, reset: false){
    
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    func setButtonEnabled(start: Bool, stop: Bool, reset: Bool){
        self.startButton.isEnabled = start
        self.stopButton.isEnabled = stop
        self.resetButton.isEnabled = reset
    }
    
    
    
    @objc func update(){
//        print(Date.timeIntervalSinceReferenceDate)
        if let startTime = self.startTime {
            let t: Double = Date.timeIntervalSinceReferenceDate - startTime + self.elapsedTime
            print(t)
            let min = Int(t / 60)
            let sec = Int(t) % 60
            let msec = Int((t - Double(sec)) * 100.0)
            self.timerLabel.text = String(format: "%02d:%02d:%02d", min, sec, msec)
        }
    }
    
    @IBAction func startTimer(_ sender: Any) {
        self.startTime = Date.timeIntervalSinceReferenceDate
        self.timer = Timer.scheduledTimer(
            timeInterval: 0.01,
            target: self,
            selector: #selector(self.update),
            userInfo: nil,
            repeats: true)
    }
    
    @IBAction func stopTimer(_ sender: Any) {
        if let startTime = self.startTime {
            self.elapsedTime += Date.timeIntervalSinceReferenceDate - startTime
        }
        self.timer.invalidate()
    }

    @IBAction func resetTimer(_ sender: Any) {
        self.startTime = nil
        self.timerLabel.text = "00:00:00"
        self.elapsedTime = 0.0
    }
    
    
}

[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key resetTimer.’

はて？
いらない接続を解除すると消えるようだが、消えんぞ。

#selector(self.hoge)がエラーになる。
func update()を@objc func update()とするとエラーが解消してbuild出来る。

@objc func update(){
        print(Date.timeIntervalSinceReferenceDate)
    }
    @IBAction func startTimer(_ sender: Any) {
        Timer.scheduledTimer(
            timeInterval: 0.01,
            target: self,
            selector: #selector(self.update),
            userInfo: nil,
            repeats: true)
    }
    
    @IBAction func stopTimer(_ sender: Any) {
    }
    
    @IBAction func resetTimer(_ sender: Any) {
    }

override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
        if identifier == "showResult" {
            guard self.nameText.text != "" else {
                let alertController = UIAlertController(title: "Error", message: "Please enter your name", preferredStye: alert)
                let defaultAction = UIAlertAction(title: "OK", style: .default, handler: nil)
                alertController.addAction(defaultAction)
                self.present(alertController, animated: true, completion: nil)
                return false
            }
            return true
        }
        return true
    }

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        guard let identifier = segue.identifier else {
            return
        }
        if identifier == "showResult"{
            let resultVC = segue.destination as! ResultViewController
            resultVC.myName = self.nameText.text!
        }
    }

iphone8のemulatorの立ちあがりが異常に遅いんだが。。。

あれ？

失敗してるーーーーーーーーーーーーーー
あ、いいのか

@IBAction func getOmikuji(sender: AnyObject) {
        // 0 - n
        // arc4random_uniform(n + 1)
        let random = arc4random_uniform(10)
        
        self.myLabel.text = String(random)
    }

おーおーお

@IBOutlet weak var myLabel: UILabel!
    
    @IBAction func getOmikuji(sender: AnyObject) {
        // 0 - n
        // arc4random_uniform(n + 1)
        let results = ["大吉", "中吉","吉", "大凶"]
        let random = arc4random_uniform(UInt32(results.count))
        
        self.myLabel.text = results[Int(random)]
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
//        myLabel.layer.borderColor = UIColor.orange.cgColor
//        myLabel.layer.borderWidth = 5
//        myLabel.layer.cornerRadius = 50
        myLabel.layer.masksToBounds = true
        myLabel.layer.cornerRadius = myLabel.bounds.width / 2
        
        
        // Do any additional setup after loading the view, typically from a nib.
    }