Xcode Swift Ios App: Adding delay

Question

I am working on a simple quiz game and i want to add some little delays to the game,now when i select the answer the game goes instantly to the next answer now i want to change the color of the button for 0.1 seconds and then loads the next question

I tried the sleep function but it adds only the delay without the color change and i can't choose time intervals smaller than a second because it accepts integers as value

here is the code

sender.backgroundColor = UIColor.greenColor()
sleep(1)
sender.backgroundColor = UIColor.whiteColor()

what i have to put instead of sleep to obtain what i want?

thanks

Nerkyator · Accepted Answer · 2015-04-20 09:30:56Z

5

If you only need a sleep function, just use

NSThread.sleepForTimeInterval(1)

answered Apr 20, 2015 at 9:30

Nerkyator

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2 Comments

GioB Over a year ago

i tried put this line between the two change color instructions,it adds the delay but doesn't change color

Andrej Over a year ago

Want to make it clear that this blocks the thread. As well as sleep() does. This does not solve GioB's issue.

TomV · Accepted Answer · 2016-11-16 11:12:53Z

2

Use usleep which takes an int in microseconds. (i.e. 1,000,000 microseconds is equivalent to 1 second) So for 0.1s use:

       // Sleep for 0.1s
       usleep(100000)

Recommend to use in a background thread. You certainly don't want to be doing this on the main UI Thread!

answered Nov 16, 2016 at 11:12

TomV

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Comments

Yılmaz Gürsoy · Accepted Answer · 2015-04-20 09:17:07Z

1

You can use NSTimer for that, firstly you implement NSTimer and you add duration time 1.0 second or what ever want then, pass the time NSTimer call its function and you change questions to another

answered Apr 20, 2015 at 9:17

Yılmaz Gürsoy

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1 Comment

GioB Over a year ago

i was already using timers,i added another one for the change of the color and it worked, thank you

user3349433 · Accepted Answer · 2015-04-20 09:16:03Z

0

I think you should try NSTimer or dispatch_after to do such things:(The NSTimer may be not so convenient as it needs a class method used as call back selector)

sender.backgroundColor = UIColor.greenColor()
dispatch_after(#your time#, 
  dispatch_get_main_queue()){
  sender.backgroundColor = UIColor.whiteColor()
  #load your new question logic#
}

P.S.:The performSelector:delay: method is not available in Swift.

answered Apr 20, 2015 at 9:16

user3349433

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