iOS projects

calc.swift

import Foundation

calculator()
func calculator() {
    let a = Int(readLine()!)! //First input
    let b = Int(readLine()!)! //Second input

    do {
        try add(n1: a, n2: b)
        try subtract(n1: a, n2: b)
        try multiply(n1: a, n2: b)
        try divide(n1: a, n2: b)
    } catch let e {
        print(e.localizedDescription)
    }

}

//Write your code below this line to make the above function calls work.
func add(n1: Int, n2: Int) throws {
    print(try operation(n1, "+", n2))
}
func subtract(n1: Int, n2: Int) throws {
    try print(operation(n1, "-", n2))
}
func multiply(n1: Int, n2: Int) throws {
    try print(operation(n1, "*", n2))
}
func divide(n1: Int, n2: Int) throws {
    try print(operation(n1, "/", n2))
}

func operation (_ x: Int, _ o: String, _ y: Int) throws -> String {
    let x = Float(x), y = Float(y)
    var r: Float
    switch o {
    case "+":
        r = x + y
    case "-":
        r = x - y
    case "*":
        r = x * y
    case "/":
        r = x / y
    default:
        throw NSError(domain: "unknown operation", code: -1)
    }
    return skipTrailingZero(r)
}

func skipTrailingZero(_ x: Float) -> String {
    let s = String(x)
    return s.hasSuffix(".0") ? String(Int(x)) : s
}

dice-game.swift

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var diceImageViewOne: UIImageView!
    @IBOutlet weak var diceImageViewTwo: UIImageView!
    
    let variants = [#imageLiteral(resourceName: "DiceOne"), #imageLiteral(resourceName: "DiceTwo"), #imageLiteral(resourceName: "DiceThree"), #imageLiteral(resourceName: "DiceFour"), #imageLiteral(resourceName: "DiceFive"), #imageLiteral(resourceName: "DiceSix")]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        forEachDice {
            $0?.alpha = 0.85
            $0?.image = variants.last
        }
    }
    
    @IBAction func ctaTouch(_ sender: UIButton) {
        forEachDice { $0?.alpha -= 0.5 }
        for i in 0...10 {
            DispatchQueue.main.asyncAfter(deadline: .now() + Double(i) / 10) {
                self.forEachDice {
                    if (i != 10 ) {
                        $0?.image = self.getRandom()
                    } else {
                        $0?.alpha += 0.5
                    }
                }
            }
        }
    }
    
    lazy var dice = [diceImageViewOne, diceImageViewTwo]
    private func forEachDice(f: (UIImageView?) -> ()) {
        dice.forEach { f($0) }
    }
    
    private func getRandom() -> UIImage {
        let random = Int.random(in: 1..<variants.count)
        return variants[random]
    }
}

egg-timer.swift

//there is also MVC version https://gist.github.com/webuniverseio/0f3b7975f28427ebace67ea9cf3304bd

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var bar: UIProgressView!

    var seconds: Float = 0
    var timer = Timer()
    var initialValue: Float = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        bar.alpha = 0
    }

    @IBAction func onChoiceSelected(_ sender: UIButton) {
        if let currentTitle = sender.currentTitle, let value = msTimers[currentTitle] {
            clearTimer()
            initialValue = value / 1000
            bar.progress = 0
            seconds = 0
            bar.alpha = 1
            timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(setTimer), userInfo: nil, repeats: true)
        }
    }

    @objc func setTimer() {
        if seconds < initialValue {
            seconds += 1
            bar.progress = seconds / initialValue
        } else {
            bar.alpha = 0
            clearTimer()
        }
    }

    func clearTimer() {
        timer.invalidate()
    }
}

var msTimers: [String: Float] = [
    "Soft": 5 * 1000,
    "Medium": 8 * 1000,
    "Hard": 12 * 1000,
]

password-generator.swift

import UIKit

// attempt #1
//var abc = [String]()
//
//var abcTemplate = "az"
//var startAndEnd: [Int] = []
//for x in abcTemplate.utf8 {
//    startAndEnd.append(Int(x))
//}
//
//for i in startAndEnd[0]...startAndEnd[1] {
//    let char = String(UnicodeScalar(i)!)
//    abc.append(char)
//}


// attempt #2
//var start: Int = -1
//for x in "a".utf8 {
//    start = Int(x)
//}

var start = Int("a".unicodeScalars.first!.value)
let abcCount = 26
var abc = Array(0..<abcCount).map { String(UnicodeScalar($0 + start)!) }

abc.shuffle()
print(abc[0...7].joined(separator: ""))

xylophone.swift

import UIKit
import AVFoundation
import Foundation

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func touchHandler(_ sender: UIButton) {
        if let title = sender.currentTitle {
            playSound(title)
        }
        sender.alpha = 0.5
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) {
            sender.alpha = 1
        }
    }

    var player: AVAudioPlayer?

    func playSound(_ resource: String) {
        do {
            guard let url = Bundle.main.url(forResource: resource, withExtension: "wav") else {
                throw NSError(domain: "\(resource) can't be found", code: Errors.noFile.rawValue)
            }
            try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
            try AVAudioSession.sharedInstance().setActive(true)
            player = try AVAudioPlayer(contentsOf: url)
            guard let player = player else {
                throw NSError(domain: "player cant start", code: Errors.noPlayer.rawValue)
            }
            player.play()
        } catch let e {
            print(e.localizedDescription)
        }
    }
}

enum Errors: Int {
    case noFile = 1000
    case noPlayer = 1001
}

Fighting game https://gist.github.com/webuniverseio/083b6cdfab4f6f698eb83236950a57b8