Xcode Objective-C iOS delay function NSTimer help

Question

So I m developing my first iOS application and I need help    Simple program for now  I have about 9 buttons and when I press the first button  or any button  I just want the first button to highlight for 60 milliseconds  unhighlight  second button highlights  wait 60 milliseconds  unhighlight and so on for the rest of the buttons so it looks like a moving LED   I ve looked tried sleep usleep but once that sleep duration is done it seems like it skips the highlight unhighlight all together   For example   -  void  button circleBusy  id sender  firstButton enabled   NO  sleep 1   firstButton enabled   YES    and so on for the rest of the buttons   It DOES delay  but it doesn t delay the  firstButton enabled   NO     I have a picture for each button s  disabled state  and I never see it   Any help s appreciated   I ve looked into NSTimer but I was unsure on how to implement it   Thanks   -Paul

User · Answer

NSTimer scheduledTimerWithTimeInterval  06 target self selector  selector goToSecondButton   userInfo nil repeats NO     Is the best one to use   Using sleep 15   will cause the user unable to perform any other actions   With the following function  you would replace goToSecondButton with the appropriate selector or command  which can also be from the frameworks

User · Answer

Try  NSDate  future    NSDate dateWithTimeIntervalSinceNow  0 06     NSThread sleepUntilDate future

User · Answer

Less code is better code    NSThread sleepForTimeInterval 0 06     Swift   Thread sleep forTimeInterval  0 06

User · Answer

sleep doesn t work because the display can only be updated after your main thread returns to the system  NSTimer is the way to go  To do this  you need to implement methods which will be called by the timer to change the buttons  An example   -  void button circleBusy  id sender       firstButton enabled   NO         60 milliseconds is  06 seconds      NSTimer scheduledTimerWithTimeInterval  06 target self selector  selector goToSecondButton   userInfo nil repeats NO     -  void goToSecondButton  id sender       firstButton enabled   YES      secondButton enabled   NO       NSTimer scheduledTimerWithTimeInterval  06 target self selector  selector goToThirdButton   userInfo nil repeats NO

User · Answer

int64 t delayInSeconds   0 6  dispatch time t popTime   dispatch time DISPATCH TIME NOW  delayInSeconds   NSEC PER SEC   dispatch after popTime  dispatch get main queue      void        do something to the button s

User · Answer

I would like to add a bit the answer by Avner Barr  When using int64  it appears that when we surpass the 1 0 value  the function seems to delay differently  So I think at this point  we should use NSTimeInterval  So  the final code is   NSTimeInterval delayInSeconds   0 05   dispatch time t popTime   dispatch time DISPATCH TIME NOW  delayInSeconds   NSEC PER SEC   dispatch after popTime  dispatch get main queue      void      do your tasks here

User · Answer

A slightly less verbose way is to use the performSelector  withObject  afterDelay  which sets up the NSTimer object for you and can be easily cancelled  So continuing with the previous example this would be   self performSelector  selector goToSecondButton  withObject nil afterDelay  06     More info in the doc

[objective-c] Xcode Objective-C | iOS: delay function / NSTimer help?

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