iOS changes the brightness of the screen by receiving messages from the distance sensor (only for real phones)

 1 #import "AppDelegate.h"

 2 

 3 @interface AppDelegate ()  4 

 5 @end

 6 

 7 @implementation AppDelegate  8 

 9 

10 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 11     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 12     // Override point for customization after application launch.

13     self.window.backgroundColor = [UIColor whiteColor]; 14     

15     UIDevice *device = [UIDevice currentDevice]; 16     device.proximityMonitoringEnabled = YES; 17     if (device.proximityMonitoringEnabled == YES) { 18  [[NSNotificationCenter defaultCenter] addObserver:self 19  selector:@selector(proximityChanged:) 20                                                      name:@"UIDeviceProximityStateDidChangeNotification" object:device]; 21  } 22     

23  [self.window makeKeyAndVisible]; 24     return YES; 25 } 26 

27 - (void)tuneBrightness:(NSTimer *)timer 28 { 29     if ([UIScreen mainScreen].brightness < 1) { 30         [UIScreen mainScreen].brightness += 0.05; 31     }else{ 32  [timer invalidate]; 33  } 34 } 35 

36 - (void)proximityChanged:(NSNotification *)notification 37 { 38     UIDevice *device = [notification object]; 39     if (!device.proximityState) { 40         [NSTimer scheduledTimerWithTimeInterval:0.3 target:self selector:@selector(tuneBrightness:) userInfo:nil repeats:YES]; 41  } 42 } 43 

44 

45 - (void)applicationWillTerminate:(UIApplication *)application { 46     //  Observer

47  [[NSNotificationCenter defaultCenter] removeObserver:self]; 48     

49 } 50 

51 @end