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

Answer 1

If you only need a sleep function, just use

NSThread.sleepForTimeInterval(1)

Answer 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!

Answer 3

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