title: Open bluetooth settings on button tap
body: <p>I've done enough looking up to now that how this used to be possible on iOS 5.1 and below, and that it's not possible in any version above that.</p>
  
  <p>But how do other apps do it?</p>
  
  <p>So far, I've tried the following (tested on <strong>iOS</strong> <strong>8.1</strong> simulator, on <strong>Xcode</strong>):</p>
  
  <pre><code>- (void)turnOnBlueToothPressed:(id)sender {
      [[UIApplication sharedApplication] openURL:[NSURL  URLWithString:UIApplicationOpenSettingsURLString]];
  }
  </code></pre>
  
  <p>Which opens the app's settings. Not ideal, but it is what it is.</p>
  
  <p>AFAIK, using the following:</p>
  
  <pre><code>[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=General&amp;path=Bluetooth"]]
  </code></pre>
  
  <p>No longer works. Alternatively, could anyone point me to the <strong>official documentation stating that it no longer works on any version > iOS 5.1</strong>?</p>