CFMagicEventsDemo

This trick was initially created to make an app for my children (available here for free : Incredible App - US/EN/FR version).
This allows to use your back camera as a simple button.
Technically, frames are captured from the back camera, and a simple algorithm is checking the fall of luminosity due to passage of your finger.

###Installation

Copy CFMagicEvents.h and CFMagicEvents files into your project.

###ARC Compatibility

Just add the -fno-objc-arc compiler flag to the CFMagicEvents.m file. To do this, go to the Build Phases tab in your target settings, open the Compile Sources group, double-click CFMagicEvents.m in the list and type -fno-objc-arc into the popover.

###Frameworks

• AVFoundation

###How to use

In AppDelegate (on didFinishLaunchingWithOptions method) :

_cfMagicEvents  = [[CFMagicEvents alloc] init];
[_cfMagicEvents startCapture];

In View(s) :

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveOnMagicEventDetected:) name:@"onMagicEventDetected" object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveOnMagicEventNotDetected:) name:@"onMagicEventNotDetected" object:nil];
}

-(void)viewWillDisappear:(BOOL)animated {
    
    [super viewWillDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}


-(void)receiveOnMagicEventDetected:(NSNotification *) notification
{
    dispatch_async(dispatch_get_main_queue(), ^{
        //YOUR CODE HERE
    });
}

-(void)receiveOnMagicEventNotDetected:(NSNotification *) notification
{
    dispatch_async(dispatch_get_main_queue(), ^{
        //YOUR CODE HERE
    });
}

##License CFMagicEvents is available under the MIT license. ENJOY !

##Contact Cédric Floury (cfloury@gmail.fr)
Twitter : @zuckerbreizh.