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.
- Possible duplicate of How to initialize properties that depend on each otherFranklin Yu– Franklin Yu2016-05-19 20:36:59 +00:00Commented May 19, 2016 at 20:36
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2 Answers
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 ... } Comments
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").
answered Sep 15, 2014 at 19:16
Michael Dautermann
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2 Comments
Olexiy Pyvovarov
Unfortunately, it doesn't help. The same issue appears: interval not found
Michael Dautermann
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.