Question

我一直试图创建一个应用程序，该应用程序会在一定时间（即五秒钟）后随机打印一个新单词。

import UIKit
class ViewController: UIViewController {

    var myTimer : Timer!
    var theValue = 0

    @IBOutlet weak var textLabel: UILabel!
    @IBOutlet weak var InspireLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib
    }

    override func viewDidDisappear(_ animated: Bool) {
        self.myTimer.invalidate()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @objc func updateMyLabel() {
        theValue += 1
        self.textLabel.text = String(theValue)
    }

    func randomText() -> String {
        if theValue > 5 {
            let words = ["Place", "Cat", "House"]
            return words.randomElement() ?? "" //Use default method to get random element from Array
        }
        return "string if theValue < 5 or equal to 5"
    }

    @IBAction func ResetButton(_ sender: Any) {
        self.myTimer.invalidate()
        theValue = 0
        self.textLabel.text = String(theValue)
    }

    @IBAction func PauseButton(_ sender: Any) {

        self.myTimer.invalidate()
    }

    @IBAction func PlayButton(_ sender: Any) {

    self.myTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateMyLabel), userInfo: nil, repeats: true)

    }
}

这是我现在拥有的所有代码。您可能会说我也是StackExchange的新手，所以请在礼节上的任何违规行为辩解。

Answer 1

由于您忘记在代码中添加else部分，因此出现了错误。

func randomText() -> String {
    if theValue > 5 {
        let words = ["Place", "Cat", "House"]
        return words.randomElement() ?? "" //Use default method to get random element from Array
    }
    return "string if theValue < 5 or equal to 5"
}

如何在iOS应用中随机打印单词？

1 个答案: