title: iOS app launch time measurement
body: <p>How can I count the time it takes from the moment the user presses the launch button on the home screen until the moment the app is active (for example, until the viewDidAppear method of the first view controller)?</p>
  
  <p>Id does not need to be programmatically but must be reliable. </p>
  
  <p>Analogously in Android, logcat can be used for this effect.</p>