下面这段代码可以实现邻近检测功能，当你的身体靠近iPhone而不是触摸的时候，iPhone将会做出反应。（需要一定的面的影射，约5mm左右的时候就会触发）
在程序初始化处，添加一个监听
UIDevice *device = [UIDevice currentDevice];
device.proximityMonitoringEnabled = YES;
if (device.proximityMonitoringEnabled == YES)
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(proximityChanged:)
name:UIDeviceProximityStateDidChangeNotification object:device];
消息响应
- (void) proximityChanged:(NSNotification *)notification {
UIDevice *device = [notification object];
NSLog(@"In proximity: %i", device.proximityState);
if(device.proximityState==1){
//do something
}
}