(91) Use of distance sensor

The distance sensor on the iphone is turned on Via Uidevice, and the system is notified by notification.

① Open distance sensor, monitoring notification:

-(void) viewdidload {    [super viewdidload];    Turn on the sensor after iOS3 via Uidevice's currentdevice proximitymonitoringenabled settings    [Uidevice Currentdevice]. proximitymonitoringenabled = YES;        When listening to objects approaching, the system notifies    [[Nsnotificationcenter defaultcenter] addobserver:self selector: @selector ( Proximitystatechange:) name:uideviceproximitystatedidchangenotification Object:nil];    }

② Implementation Notification Method: When the object is close to the distance sensor, the phone will automatically lock the screen, and proximitystate is yes, otherwise no.

-(void) Proximitystatechange: (nsnotification *) nof{        NSLog (@ "%d", [Uidevice currentdevice].proximitystate);    if ([Uidevice currentdevice].proximitystate) {        NSLog (@ "near");    } else{        NSLog (@ "Leave");    }    }

To remove a notification when ③dealloc:

-(void) dealloc{        [[Nsnotificationcenter Defaultcenter] removeobserver:self];    }

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(91) Use of distance sensor