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Question

Just a simple task, but I'm in trouble. Trying to make a different way but it fails.

How to init NSTimer with declared previously variable? Neither var nor let helps.

Invulnerable

Possible duplicate of How to initialize properties that depend on each other – Dogie

Answer 1

The initial value of a property (in your case: timer) cannot depend on another property of the class (in your case: interval).

Therefore you have to move the assigment timer = NSTimer(interval, ...) into a method of the class, e.g. into viewDidLoad. As a consequence, timer has to be defined as an optional or implicitly unwrapped optional.

Note also that Selector(...) takes a literal string as argument, not the method itself.

So this should work:

class ViewController: UIViewController {

    var interval : NSTimeInterval = 1.0
    var timer : NSTimer!

    func timerRedraw() {

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        timer = NSTimer(timeInterval: interval, target: self, selector: Selector("timerRedraw"), userInfo: nil, repeats: true)

        // ...
    }

    // Other methods ...
}

Rossuck

Answer 2

Try:

var interval:NSTimeInterval = 1.0
var timer = NSTimer.scheduledTimerWithTimeInterval(interval, target: self, selector: "timerRedraw:", userInfo: nil, repeats: true)

pro-tip and hopefully an appreciated FYI: Swift functions should also start with lower case letters (i.e. "timerRedraw").

Humiliate

Unfortunately, it doesn't help. The same issue appears: interval not found – Invulnerable

yeah, I forgot to note that you need to put your two variables into your "viewDidLoad" method. Which is exactly what the other guy answering correctly said. I gave him a +1 for that. – Humiliate