Objective C equivalent to javascripts setTimeout?

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The performSelector: family has its limitations. Here is the closest setTimeout equivalent:

dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * 0.5);
dispatch_after(delay, dispatch_get_main_queue(), ^(void){
    // do work in the UI thread here
});

EDIT:
A couple of projects that provide syntactic sugar and the ability to cancel execution (clearTimeout):

  • https://github.com/Spaceman-Labs/Dispatch-Cancel
  • https://gist.github.com/zwaldowski/955123

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