leoShih

 var restaurantNames = ["Cafe Deadend", "Homei", "Teakha", "Cafe Loisl", "Petite Oyster", "For Kee Restaurant", "Po's Atelier", "Bourke Street Bakery", "Haigh's Chocolate", "Palomino Espresso", "Upstate", "Traif", "Graham Avenue Meats", "Waffle & Wolf", "Five Leaves", "Cafe Lore", "Confessional", "Barrafina", "Donostia", "Royal Oak", "CASK Pub and Kitchen"]
    
 var restaurantImages = ["cafedeadend.jpg", "homei.jpg", "teakha.jpg", "cafeloisl.jpg", "petiteoyster.jpg", "forkeerestaurant.jpg", "posatelier.jpg", "bourkestreetbakery.jpg", "haighschocolate.jpg", "palominoespresso.jpg", "upstate.jpg", "traif.jpg", "grahamavenuemeats.jpg", "wafflewolf.jpg", "fiveleaves.jpg", "cafelore.jpg", "confessional.jpg", "barrafina.jpg", "donostia.jpg", "royaloak.jpg", "caskpubkitchen.jpg"]
    
 var restaurantLocations = ["Hong Kong", "Hong Kong", "Hong Kong", "Hong Kong", "Hong Kong", "Hong Kong", "Hong Kong", "Sydney", "Sydney", "Sydney", "New York", "New York", "New York", "New York", "New York", "New York", "New York", "L

leoShih

class ViewController: UIViewController {
    
    let colors = [UIColor.black, UIColor.blue]
    var index = 0
    
    
    @IBOutlet weak var btnView: UIButton!
    @IBAction func btn(_ sender: Any){

        btnView.backgroundColor = colors[index]

leoShih

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var BtnView: UIButton!
    
    var index = 0
    var colors =
        [UIColor(red: 1, green: 0, blue: 0, alpha: 1),
        UIColor(red: 1, green: 127/255, blue: 0, alpha: 1),

leoShih

//照片array
    var logoImage:[UIImage] = [
        UIImage(named: "Audi")!,
        UIImage(named: "Benz")!,
        UIImage(named: "BMW")!,
        UIImage(named: "Ferrari")!,
        UIImage(named: "McLaren")!,
        UIImage(named: "Toyota")!,
        UIImage(named: "Volkswagen")!,
    ]   

leoShih

var startNumber = 240
var timer = Timer()
func runTime() {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(ViewController.tTimer)), userInfo: nil, repeats: true)
    }

@objc func tTimer() {
    if startNumber > 0 {
        startNumber -= 1
        numberLabel.text = String(startNumber)

leoShih

@IBAction func stopButton(_ sender: Any) {        
        timer.invalidate()          
}
       
@IBAction func resetButton(_ sender: Any) {       
        startNumber = 240
        numberLabel.text = String(startNumber)
        timer.invalidate()        
}