Question

What is the best way of repeatedly executing a method at random time intervals, so for example the code in the method is run at 1s, 3s, 7s, 10s, 11s, 13s, 19s, 22s, etc,. for an infinite amount of time?

Answer 1

I would set a timer and on each time through check against a random number and if that random number hits then call the function:

[NSTimer scheduledTimerWithInterval: 1.0 target:self selector:@selector(targetMethod:) userInfo:nil repeats: YES];

and in the targetMethod

if(arc4random() % 10 == 1)
{
   //call your function
}