使用情景:比如打电话时拿起来贴近脸后屏幕会变黑,拿开就变亮.

使用方法:

//1.开启距离传感器(注意:默认情况距离传感器是关闭的)

[UIApplicationsharedApplication].proximitySensingEnabled=YES;

[UIDevicecurrentDevice].proximityMonitoringEnabled=YES;

//2.开启之后,开始实时监听

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(proximityMonitorDidChange:)name:UIDeviceProximityStateDidChangeNotificationobject:nil];

这时就可以获取是否有物体靠近了.

- (void)proximityMonitorDidChange:(NSNotification*)not {

   if([UIDevicecurrentDevice].proximityState) {

        NSLog(@"物体靠近");

   }else{

        NSLog(@"物体离开");

   }

}