xcode - ViewController.Type does not have a member named -

just simple task, i'm in trouble. trying make different way fails.

how init nstimer declared variable? neither var nor let helps.

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

therefore have move assigment timer = nstimer(interval, ...) method of class, e.g. viewdidload. consequence, timer has defined optional or implicitly unwrapped optional.

note selector(...) takes literal string argument, not method itself.

so 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 ... }