// 1開啟距離感應(yīng)功能
[UIDevice currentDevice].proximityMonitoringEnabled = YES;
// 2監(jiān)聽距離感應(yīng)的通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(proximityChange:)
name:UIDeviceProximityStateDidChangeNotification
object:nil];

• (void)proximityChange:(NSNotificationCenter *)notification {
  if ([UIDevice currentDevice].proximityState == YES) {
  NSLog(@"某個物體靠近了設(shè)備屏幕"); // 屏幕會自動鎖住
  } else {
  NSLog(@"某個物體遠(yuǎn)離了設(shè)備屏幕"); // 屏幕會自動解鎖
  }
  }