Do something every minute in Swift 4?

Asked Oct 18 '17 at 08:57

Active Oct 18 '17 at 09:07

Viewed 95 times

I am doing an iOS app using Swift 4 but I am struggling to find how to execute a certain amount of code every minute.

There is a timer in my app which calculate the difference between the starting time and the current time and I should update a label with the result every minute.

I think that I should use scheduledTimer(timeInterval:target:selector:userInfo:repeats:) but I don't understand how should I implement it.

By trying with the answer of Unheilig with

var helloWorldTimer = Timer.scheduledTimer(timeInterval: 60.0, target: self, selector: #selector(ViewController.sayHello), userInfo: nil, repeats: true)

        func sayHello()
        {
            NSLog("hello World")
        }

I got the error Type 'ViewController' has no member 'sayHello'

edited Oct 18 '17 at 09:07

asked Oct 18 '17 at 08:57

Julien

The function `sayHello()` must be on the top level of the class. – vadian Oct 18 '17 at 09:18
3

For Swift 4, the method of which you want to get the selector must be exposed to Objective-C, thus @objc attribute must be added to the method declaration. e.g ``` @objc func sayHello(){} ``` – Shamim Hossain Oct 18 '17 at 09:43
@ShamimHossain Thank you! It works! – Julien Oct 18 '17 at 09:45

Do something every minute in Swift 4?

0 Answers0