Xcode无法识别Timer（）-Swift 3

Question

New to Swift here- I'm trying to achieve a simple segue operation after predefined times lapses. But for some reason my Xcode isn't recognizing the Timer and gives error "Timer module has no member named scheduledTimer". I couldn't find help anywhere.

CODE:

import UIKit

class ViewController: UIViewController {

    let emptystring = String()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        var time = Timer.scheduledTimer(timeInterval: 8.0, target: self, selector: #selector(changeview), userInfo: nil, repeats: false)
    }

    func changeview (){
        self.performSegueWithIdentifier("GoToMain", sender: self)
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if (segue.identifier == "GoToMain"){
            let destination = (segue.destinationViewController as! UINavigationController).viewControllers[0] as! SecondView
            destination.emptyString = emptystring
        }
        print("Segue Performed")
    }

}

Picture also shows my entire code, including the error. NOTE: It's not my own code. I only followed the answer to question in following link:

Xcode Swift 3: Timer and Segue View Controller Error

Answer 1

You have declared the first parameter as timerInterval but it should be timeInterval instead.

So change:

var time = Timer.scheduledTimer(timerInterval: 8.0, target: self, selecter: #selector(changeview), userInfo: nil, repeats: false

To:

var time = Timer.scheduledTimer(timeInterval: 8.0, target: self, selector: #selector(changeview), userInfo: nil, repeats: false)

Answer 2

Timer is a Swift 3 type, but judging from the rest of your method signatures, you appear to be using Swift 2. Use NSTimer in Swift 2.

---

Also, for future reference, in addition to the timeInterval typo (which you've now fixed), the third parameter is selector , not selecter .

---

So, in Swift 2:

NSTimer.scheduledTimerWithTimeInterval(8.0, target: self, selector: #selector(changeview), userInfo: nil, repeats: false)

Or in Swift 3:

Timer.scheduledTimer(timeInterval: 8.0, target: self, selector: #selector(changeview), userInfo: nil, repeats: false)

Answer 3

Also note that with Swift 4, you have to add @objc to the selector you call after the timer expires, because the code that calls this selector is apparently still written in Objective-C.

So change:

func changeview()

to this:

@objc func changeview()