Swift performSelector withObject afterDelay is unavailable

Question

I have an app in Objective C that I m transitioning to Swift  In Objective C  I have this method    self view performSelector  selector someSelector  withObject self afterDelay 0 1f    I m working with Swift and I can t figure out how to do this  I ve tried   self view performSelector Selector  someSelector    withObject  self  afterDelay  0 1   Here s the error that I get   performSelector  is unavailable   performSelector  methods are unavailable  What call would I use to call a method afterDelay   UPDATE  Here s what I ended up with   extension NSObject        func callSelectorAsync selector  Selector  object  AnyObject   delay  NSTimeInterval  - gt  NSTimer            let timer   NSTimer scheduledTimerWithTimeInterval delay  target  self  selector  selector  userInfo  object  repeats  false          return timer            func callSelector selector  Selector  object  AnyObject   delay  NSTimeInterval             let delay   delay   Double NSEC PER SEC          let time   dispatch time DISPATCH TIME NOW  Int64 delay           dispatch after time  dispatch get main queue                  NSThread detachNewThreadSelector selector  toTarget self  withObject  object

User · Answer

You could do this    var timer   NSTimer scheduledTimerWithTimeInterval 0 1  target  self  selector  Selector  someSelector    userInfo  nil  repeats  false   func someSelector            Something after a delay     SWIFT 3  let timer   Timer scheduledTimer timeInterval  0 1  target  self  selector   selector someSelector   userInfo  nil  repeats  false   func someSelector            Something after a delay

User · Answer

Swift is statically typed so the performSelector  methods are to fall by the wayside   Instead  use GCD to dispatch a suitable block to the relevant queue     in this case it ll presumably be the main queue since it looks like you re doing UIKit work   EDIT  the relevant performSelector  is also notably missing from the Swift version of the NSRunLoop documentation   1 Objective-C symbol hidden   so you can t jump straight in with that  With that and its absence from the Swiftified NSObject I d argue it s pretty clear what Apple is thinking here

User · Answer

Swift 4  DispatchQueue main asyncAfter deadline   now     0 1           your function here     Swift 3  DispatchQueue main asyncAfter deadline   now      seconds 0 1            your function here     Swift 2  let dispatchTime  dispatch time t   dispatch time DISPATCH TIME NOW  Int64 0 1   Double NSEC PER SEC     dispatch after dispatchTime  dispatch get main queue              your function here

[ios] Swift performSelector:withObject:afterDelay: is unavailable

SWIFT 3

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