如何根据Swift中的持续时间更改UI中的图像

Question

我正在执行iWatch应用程序。在这种情况下，用户必须步行6分钟。在此，我正在显示计时器。因此，我必须更改行走图像。我有8张图片。例如image1.png，image2.png等到image8.png

如何根据持续时间更改图像。

我是Swift语言的新手。

    @IBOutlet weak var walkingImage: WKInterfaceImage!
    let walkingImagesArray = ["walking1.png", "walking2.png", "walking3.png","walking4.png", "walking5.png","walking6.png", "walking7.png", "walking8.png"]

    override func awake(withContext context: Any?) {
        super.awake(withContext: context)
        self.startTimer()
}

    func startTimer() {
        self.countdownTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateTime), userInfo: nil, repeats: true)
    }


    @objc func updateTime() {
        count = count + 1
        if(count < 361) {
            timerLabel.setText(String(timeString(time: TimeInterval(count))))
           //here I have to use switch case to change image
        } else {
            print("Workout completed")
            countdownTimer.invalidate()
            session.end()
            builder.endCollection(withEnd: Date()) { (success, error) in
                self.builder.finishWorkout { (workout, error) in
                    DispatchQueue.main.async() {
                        self.session = nil
                        self.builder = nil
                    }
                }
            }
        }
        print("\(count)")
    }

有什么建议吗？

Answer 1

您可以启动计时器6分钟，然后每6分钟更改一次图像。

var timer: Timer?
var currentIndex: Int = 0
let walkingImagesArray = ["walking1.png", "walking2.png", "walking3.png","walking4.png", "walking5.png","walking6.png", "walking7.png", "walking8.png"]

func startTimer() {
    if let timer = timer {
        self.timer = timer

    } else {
        Timer.scheduledTimer(withTimeInterval: 360, repeats: true) { timer in
            //Change your image here
            self.currentIndex = self.currentIndex + 1
            self. walkingImage.image = self.walkingImagesArray[self.currentIndex]
        }
    }
}

func stopTimer() {
    self.timer?.invalidate()
    self.timer = nil
}

Answer 2

如果少于60秒，则生成的图像将被命名为“ walking0.png”

解决方案：

func image(time: Int) -> String {
    let sekInt = time / 60
    let sek = String(sekInt)
    return "walking\(sek).png"
}

self.walkingImage.setImage(UIImage(contentsOfFile: image(time:count)))

单元测试：

func testExample() {
    XCTAssertEqual(image(time: 360), "walking6.png")
    XCTAssertEqual(image(time: 359), "walking5.png")
    XCTAssertEqual(image(time: 301), "walking5.png")
    XCTAssertEqual(image(time: 300), "walking5.png")
    XCTAssertEqual(image(time: 299), "walking4.png")
    XCTAssertEqual(image(time: 61), "walking1.png")
    XCTAssertEqual(image(time: 60), "walking1.png")
    XCTAssertEqual(image(time: 59), "walking0.png")
    XCTAssertEqual(image(time: 1), "walking0.png")
    XCTAssertEqual(image(time: 0), "walking0.png")
}