Added pan and tap gesture support

Pan now tracks the movement of the finger and tap 
will bring the viewController to the foreground

Source/CAFCardStackController.m

@@ -10,13 +10,26 @@
 #import "UIView+ImageExtensions.h"
 
 
-@implementation CAFCardStackController
+const CGFloat CAFCardStackControllerDefaultAnimationDuration = 0.3;
+
+@interface CAFCardStackController ()
+- (void)didReceivePanGesture:(UIPanGestureRecognizer *)panGesture;
+- (void)didReceiveTapGesture:(UITapGestureRecognizer *)tapGesture;
+@end
+
+
+@implementation CAFCardStackController {
+	NSMutableDictionary *_viewControllerIDMap;
+	NSMutableDictionary *_viewIDMap;
+}
 
 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
         // Custom initialization
+		_viewControllerIDMap = [[NSMutableDictionary alloc] init];
+		_viewIDMap = [[NSMutableDictionary alloc] init];
     }
     return self;
 }
@@ -54,30 +67,77 @@ - (NSArray *)cardViewControllers
 #pragma mark - Instance Methods
 - (void)addCardViewController:(UIViewController *)viewController
 {
-	UIView *addedView = viewController.view;
-	addedView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
-	addedView.frame = CGRectMake(0.0, 0.0, 768.0, 1004.0);
-
-	UIImage *viewImage = [addedView caf_imageRepresentation];
-	UIImageView *imageView = [[UIImageView alloc] initWithImage:viewImage];
-	imageView.contentMode = UIViewContentModeScaleAspectFit;
-	imageView.frame = CGRectMake(0.0, 0.0, 384.0, 502.0);
-	[self.view addSubview:imageView];
-
-//	[self addChildViewController:viewController];
-//	
-//	UIView *addedView = viewController.view;
-//	[self.view addSubview:addedView];
-//	addedView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
-//	addedView.frame = self.view.bounds;
+//	if (viewController 
+//		&& ![_cardViewControllers containsObject:viewController]) {
+//		
+//		[_cardViewControllers addObject:viewController];
+//		[_viewControllerDictionary setObject:viewController 
+//									  forKey:uniqueString];
 //		
-//	[viewController didMoveToParentViewController:self];
+//		
+//		UIView *addedView = viewController.view;
+//		addedView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
+//		addedView.frame = self.view.bounds;
+//		UIImage *viewImage = [addedView caf_imageRepresentation];
+//		UIImageView *imageView = [[UIImageView alloc] initWithImage:viewImage];
+//		imageView.contentMode = UIViewContentModeScaleAspectFit;
+//		CGFloat scale = 0.45;
+//		imageView.frame = CGRectMake(60.0, 
+//									 60.0, 
+//									 roundf(addedView.frame.size.width * scale), 
+//									 roundf(addedView.frame.size.height * scale));
+//		[self.view addSubview:imageView];
+//	}
+
+	if (viewController 
+		&& ![self.childViewControllers containsObject:viewController]) {
+		CFUUIDRef uniqueID = CFUUIDCreate(kCFAllocatorDefault);
+		CFStringRef uniqueStringRef = CFUUIDCreateString(kCFAllocatorDefault, 
+														 uniqueID);
+		NSString *uniqueString = (__bridge NSString *)uniqueStringRef;
+
+		[_viewControllerIDMap setObject:viewController forKey:uniqueString];
+		[self addChildViewController:viewController];
+
+		UIView *addedView = viewController.view;
+		[_viewIDMap setObject:addedView forKey:uniqueString];
+
+		addedView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
+		addedView.frame = self.view.bounds;
+		addedView.alpha = 0.0f;
+		addedView.transform  = CGAffineTransformMakeScale(0.45f, 0.45f);
+		[self.view addSubview:addedView];
+		[UIView animateWithDuration:CAFCardStackControllerDefaultAnimationDuration 
+						 animations:^{
+							 addedView.alpha = 1.0f;
+						 } 
+						 completion:^(BOOL finished) {
+							 [viewController didMoveToParentViewController:self];
+						 }];
+
+		UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self 
+																							   action:@selector(didReceivePanGesture:)];
+		[addedView addGestureRecognizer:panGestureRecognizer];
+
+		UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self 
+																							   action:@selector(didReceiveTapGesture:)];
+		[addedView addGestureRecognizer:tapGestureRecognizer];
+	}
 }
 
 
 - (void)focusCardViewController:(UIViewController *)viewController
 {
-
+	UIView *view = viewController.view;
+	NSArray *gestureRecognizers = view.gestureRecognizers;
+	for (UIGestureRecognizer *gestureRecognizer in gestureRecognizers) {
+		[view removeGestureRecognizer:gestureRecognizer];
+	}
+	[UIView animateWithDuration:CAFCardStackControllerDefaultAnimationDuration 
+					 animations:^{
+						 view.transform  = CGAffineTransformIdentity;
+						 view.frame = self.view.bounds;
+					 }];
 }
 
 
@@ -92,4 +152,38 @@ - (void)removeCardViewController:(UIViewController *)viewController
 
 }
 
+
+#pragma mark - Private Methods
+- (void)didReceivePanGesture:(UIPanGestureRecognizer *)panGesture
+{
+	CGPoint translate = [panGesture translationInView:self.view];
+
+	if (panGesture.state == UIGestureRecognizerStateBegan || panGesture.state == UIGestureRecognizerStateChanged) {
+		UIView *view = panGesture.view;
+		CGPoint translation = [panGesture translationInView:view.superview];
+		[view setCenter:CGPointMake(view.center.x + translation.x, view.center.y + translation.y)];
+		[panGesture setTranslation:CGPointZero inView:view.superview];
+	} else if (panGesture.state == UIGestureRecognizerStateEnded) {
+		CGRect newFrame = panGesture.view.frame;
+		newFrame.origin.x += translate.x;
+		newFrame.origin.y += translate.y;
+
+		panGesture.view.frame = newFrame;
+	}
+}
+
+
+- (void)didReceiveTapGesture:(UITapGestureRecognizer *)tapGesture
+{
+	if (tapGesture.state == UIGestureRecognizerStateEnded) {
+		UIView *currentView = tapGesture.view;
+		NSArray *viewIDs = [_viewIDMap allKeysForObject:currentView];
+		if ([viewIDs count] == 1) {
+			NSString *viewID = [viewIDs lastObject];
+			UIViewController *currentViewController = [_viewControllerIDMap objectForKey:viewID];
+			[self focusCardViewController:currentViewController];
+		}
+	}
+}
+
 @end