Question

在Swift 3中 - 我试图在点击它之后将按钮的颜色改变一秒，这样用户就会得到一个指示是对还是错。好像我需要强制更新显示，但我不确定如何。

@IBAction func answer1(_ sender: UIButton) {
    if (sender.tag == rightAnswerPlacement) {
        sender.backgroundColor = UIColor.green
        gmaeScore += 1
    } else {
        sender.backgroundColor = UIColor.red
        gmaeScore -= 1
    }
    sleep(1)
    score.text = "Score: \(gmaeScore)"
    newQuestion()
}

func newQuestion() {
    var firstResult: Int, secondResult: Int, thirdResult: Int, finalResult:Int
    (firstResult, secondResult, thirdResult, finalResult) = generateQuestion()

    timeCount = 0

    firstAnswer.text = String(firstResult)
    secondAnswer.text = String(secondResult)
    thirdAnswer.text = String(thirdResult)

    rightAnswerPlacement = generateNumber(range: 4, positive: true)

    var button:UIButton = UIButton()

    var alternativeAnswer = 0

    //IUterate over the buttons

    var allAnswers = Set<Int>()
    allAnswers.insert(finalResult)

    for i in 1...4 {
        //Converting each of the buuton tags into a button
        button = view.viewWithTag(i) as! UIButton
        button.backgroundColor = UIColor.blue
        if (i == Int(rightAnswerPlacement)){
            button.setTitle(String(finalResult), for: .normal)
        } else {
            var myRange = finalResult * 2
            if (myRange < 0) {
                myRange *= -1
            }
            alternativeAnswer =  generateNumber(range: myRange)
            while allAnswers.contains(alternativeAnswer) {
                alternativeAnswer =  generateNumber(range: myRange)
            }
            allAnswers.insert(alternativeAnswer)
            button.setTitle(String(alternativeAnswer), for: .normal)
        }
    }

Answer 1

@IBAction func answer1(_ sender: UIButton) {
    if (sender.tag == rightAnswerPlacement) {
        UIView.animate(withDuration: 0.5, animations: {
            sender.backgroundColor = UIColor.green
        },completion: { _ in
            sender.backgroundColor = UIColor.green //change it back to original color
        })

        gmaeScore += 1
    } else {
        UIView.animate(withDuration: 0.5, animations: {
            sender.backgroundColor = .red
        },completion: { _ in
            sender.backgroundColor = UIColor.green //change it back to original color
        })
        gmaeScore -= 1
    }
    sleep(1)
    score.text = "Score: \(gmaeScore)"
    newQuestion()
}

完成程序段将在您的持续时间后执行：）

Answer 2

你可以试试这个

@IBAction func answer1(_ sender: UIButton) {
        UIView.animate(withDuration: 1) {
            sender.backgroundColor = .green
            sender.backgroundColor = .red
        }
}

在Swift 3中 - 我试图在点击它之后将按钮颜色更改为一秒钟，因此用户将获得指示是对还是错

2 个答案: