iOS Development - Timer App

Here, we are going to make a Timer app for an iOS, using Swift 3 and Xcode 8.

Open Xcode and create a new Single View Application and name it Timer (You can name it anything you like).

 

 

 

Click Main.StoryBoard.
 

Add a label to display the seconds (We are going to set 240 as default ). Resize it in Properties menu.

 

Add a navigation bar to the top and change the title of Timer.

 

Add two Bar buttons on the top navigation bar and change the System Item into play and pause.

 

Add a Toolbar to the bottom and rename the item to “-10”.

 

Add two bar button items and name them “Reset “and “+10”.

 

Click ViewController.Swift.

Now, control + drag label to the program and name it “timerLabel”.

Control + drag each button to the code and name them “play”,”pause”,”minusTen”,”plusTen”,”resetTimer”(Connection type must be Button).

Edit the code, as given below.

import UIKit
class ViewController: UIViewController {
    var timer = Timer()
    var time = 240
    func decreaseTimer() {
        if time > 0 {
            time = time - 1
            timerLabel.text = String(time)
        } else {
            timer.invalidate()
        }
    }
    @IBOutlet weak
    var timerLabel: UILabel!@IBAction func play(_ sender: Any) {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.decreaseTimer), userInfo: nil, repeats: true)
    }
    @IBAction func pause(_ sender: Any) {
        timer.invalidate()
    }
    @IBAction func minusTen(_ sender: Any) {
        if time > 10 {
            time -= 10
            timerLabel.text = String(time)
        }
    }
    @IBAction func plusTen(_ sender: Any) {
        time += 10
        timerLabel.text = String(time)
    }
    @IBAction func resetTimer(_ sender: Any) {
        time = 240
        timerLabel.text = String(time)
    }
    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.
    }
}

Now, run the app.