IOS傳感器的使用

/*
    傳感器的使用：
 1.註冊一個傳感器通知；
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(stateChange:) name:@"UIDeviceProximityStateDidChangeNotification" object:nil];
 2，設置傳感器的proximityMonitoringEnabled屬性爲YES;
 
 */
- (void) toggle: (id) sender
{
	BOOL isIt = [UIDevice currentDevice].proximityMonitoringEnabled;//判斷傳感器是不是啓動的
	NSString *title = isIt ? @"Enable" : @"Disable";
	self.navigationItem.rightBarButtonItem = BARBUTTON(title, @selector(toggle:));
	[UIDevice currentDevice].proximityMonitoringEnabled = !isIt;//改變傳感器狀態
	
	self.log = [NSMutableString string];
	[self doLog:@"You have %@ the Proximity sensor.", isIt ? @"disabled" : @"enabled"];
	if (!isIt) [self doLog:@"View state changes on the debugger consoler as the screen is not readable when blanked."];
}

- (void) stateChange: (NSNotification *) notification
{
    NSLog(@"notification.userinfo:%@",notification.userInfo);
	NSLog(@"The proximity sensor %@", [UIDevice currentDevice].proximityState ? @"will now blank the screen" : @"will now restore the screen");
}

- (void) viewDidLoad
{
	self.navigationController.navigationBar.tintColor = COOKBOOK_PURPLE_COLOR;
	self.navigationItem.rightBarButtonItem = BARBUTTON(@"Enable", @selector(toggle:));
	
    //註冊傳感器通知
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(stateChange:) name:@"UIDeviceProximityStateDidChangeNotification" object:nil];
}