High-precision timer in iOS <p>What is the most precise way to measure time intervals in iOS? So far I have been using <code>NSDate</code> to "mark" events and then <code>timeIntervalSinceDate</code> method to calculate the interval, but is there more precise approach? E.g. Windows has so called <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx" rel="nofollow">QPC</a> for that kind of thing. Is there something similar in iOS (or MacOSX) world?</p>