Question

我正在为我的应用程序开始倒数计时器，从15开始倒计时。这是我的代码：

//


import UIKit

class ViewController2: UIViewController {
     @IBOutlet weak var Timer: UILabel!


    var countd = 15








//
//
    override func viewDidLoad() {

    super.viewDidLoad()
    let time = NSTimer(timeInterval: 1.0, target: self,  selector: "updateCounter", userInfo: nil, repeats: true)
     Timer.text = String(countd)
NSRunLoop.mainRunLoop().addTimer(time, forMode: NSDefaultRunLoopMode)

    }

  func updateCounter(timer: NSTimer) {


        Timer.text = String(countd)

        if (countd > 0){

            Timer.text = String(countd--)
            Timer.text = String(countd)
        }

    }





        // Do any additional setup after loading the view.


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

然而，当我运行它时，一旦我到达带有计时器的部件，我看到标签闪烁15一秒钟然后它立即崩溃并出现SIGABRT错误。我该怎么办？

Answer 1

更改

selector: "updateCounter"

到

selector: "updateCounter:"

请注意，在Swift 2.2中，很难犯这个错误（编译器会发出警告），而在Swift 3中它将变得不可能（字符串文字选择器语法将变为非法）。如果您不了解字符串文字选择器语法，您可能希望立即更新到Swift 2.2 。

制作倒数计时器时Swift Signal SIGABRT错误？

1 个答案: