Question

我试图在计时器达到0后立即执行segue。我的代码如下所示，用于viewDidLoad中的计时器：

override func viewDidLoad() {
        super.viewDidLoad()

        if timerRunning == false {
            timerCounter = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(Counting), userInfo: nil, repeats: true)
            timerRunning = true
        }

        if counter == 0 {
            timerRunning = false
        }

这是功能计数器：

func Counting() {

    counter -= 1
    timer.text = "\(counter)"
    if counter == 0 {
        timerCounter.invalidate()
        timerRunning = false
        self.performSegue(withIdentifier: "resultView", sender: self)
    }
}

Answer 1

您只需要在主线程上执行segue。使用

DispatchQueue.main.async{
   self.performSegue(withIdentifier: "resultView", sender: self)
}

Answer 2

如果您确定segue标识符对performSegue调用以及在storyboard或xib中都是正确的，那么也许self会以某种方式在它应该被解除分配之前被解除分配？

试试这个：

DispatchQueue.main.async{

    [weak self] in

    self?.performSegue(WithIdentifier:"resultView", sender: self)

}

或者在运行performSegue之前尝试自选链接自我以确定。

定时器完成后执行segue

2 个答案: