Feature/pop off on drag right

Example/PSStackedViewExample.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		1F82478114EB76AD00773D9B /* popIcon.png in Resources */ = {isa = PBXBuildFile; fileRef = 1F82478014EB76AD00773D9B /* popIcon.png */; };
 		1FEE7FF814C8E23200424F88 /* PSStackedViewSegue.m in Sources */ = {isa = PBXBuildFile; fileRef = 1FEE7FF714C8E23200424F88 /* PSStackedViewSegue.m */; };
 		3798AD7B13E0B299004C1E33 /* error.png in Resources */ = {isa = PBXBuildFile; fileRef = 3798AD7413E0B299004C1E33 /* error.png */; };
 		3798AD7D13E0B299004C1E33 /* [email protected] in Resources */ = {isa = PBXBuildFile; fileRef = 3798AD7613E0B299004C1E33 /* [email protected] */; };
@@ -39,6 +40,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		1F82478014EB76AD00773D9B /* popIcon.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = popIcon.png; sourceTree = "<group>"; };
 		1FEE7FF614C8E23200424F88 /* PSStackedViewSegue.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PSStackedViewSegue.h; path = ../../PSStackedView/PSStackedViewSegue.h; sourceTree = "<group>"; };
 		1FEE7FF714C8E23200424F88 /* PSStackedViewSegue.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = PSStackedViewSegue.m; path = ../../PSStackedView/PSStackedViewSegue.m; sourceTree = "<group>"; };
 		3798AD7413E0B299004C1E33 /* error.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = error.png; sourceTree = "<group>"; };
@@ -209,6 +211,7 @@
 		7884393E13CEF82D00D18A56 /* Images */ = {
 			isa = PBXGroup;
 			children = (
+				1F82478014EB76AD00773D9B /* popIcon.png */,
 				3798AD7313E0B299004C1E33 /* error */,
 				3798AD7713E0B299004C1E33 /* NewGlow */,
 				78BA6A1313CF05C200DDA16E /* 08-chat.png */,
@@ -283,6 +286,7 @@
 				3798AD7D13E0B299004C1E33 /* [email protected] in Resources */,
 				3798AD7E13E0B299004C1E33 /* NewGlow.png in Resources */,
 				3798AD8013E0B299004C1E33 /* [email protected] in Resources */,
+				1F82478114EB76AD00773D9B /* popIcon.png in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Example/StackedViewKitExample/AppDelegate.m

@@ -26,6 +26,9 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
     // set root controller as stack controller
     ExampleMenuRootController *menuController = [[ExampleMenuRootController alloc] init];
     self.stackController = [[PSStackedViewController alloc] initWithRootViewController:menuController];
+    self.stackController.enablePopOffOnDragRight = YES;
+    self.stackController.popOffType = SVPopOptionAllButFirst;
+    self.stackController.delegate = menuController;
     self.window.rootViewController = self.stackController;
     [self.window makeKeyAndVisible];
 

Example/StackedViewKitExample/ExampleMenuRootController.h

@@ -8,8 +8,10 @@
 
 #import <UIKit/UIKit.h>
 
-@interface ExampleMenuRootController : UIViewController <UITableViewDataSource, UITableViewDelegate> {
+@interface ExampleMenuRootController : UIViewController <UITableViewDataSource, UITableViewDelegate, PSStackedViewDelegate> {
     UITableView *menuTable_;
+    UIImageView *popIconLeft_;
+    UIImageView *popIconRight_;
     NSArray *cellContents_;
 }
 

Example/StackedViewKitExample/ExampleMenuRootController.m

@@ -23,12 +23,16 @@
 @interface ExampleMenuRootController()
 @property (nonatomic, strong) UITableView *menuTable;
 @property (nonatomic, strong) NSArray *cellContents;
+@property (nonatomic, strong) UIImageView *popIconLeft;
+@property (nonatomic, strong) UIImageView *popIconRight;
 @end
 
 @implementation ExampleMenuRootController
 
 @synthesize menuTable = menuTable_;
 @synthesize cellContents = cellContents_;
+@synthesize popIconLeft = popIconLeft_;
+@synthesize popIconRight = popIconRight_;
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 #pragma mark - NSObject
@@ -69,6 +73,16 @@ - (void)viewDidLoad {
     self.menuTable.dataSource = self;
     [self.view addSubview:self.menuTable];
     [self.menuTable reloadData];
+
+    self.popIconLeft = [[UIImageView alloc] initWithFrame:CGRectMake(225, 482, 50, 70)];
+    self.popIconLeft.image = [UIImage imageNamed:@"popIcon.png"];
+    self.popIconLeft.alpha = 0.0;
+    [self.view addSubview:self.popIconLeft];
+
+    self.popIconRight = [[UIImageView alloc] initWithFrame:CGRectMake(245, 502, 50, 70)];
+    self.popIconRight.image = [UIImage imageNamed:@"popIcon.png"];
+    self.popIconRight.alpha = 0.0;
+    [self.view addSubview:self.popIconRight];
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
@@ -145,4 +159,43 @@ - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath
     }
 }
 
+/// PSStackedViewDelegate methods
+
+- (void)stackedViewDidStartDragging:(PSStackedViewController *)stackedView {
+    if([stackedView.viewControllers count] > 1) {
+        [UIView animateWithDuration:0.2 animations:^(void) {
+            self.popIconLeft.alpha = 1.0;
+            self.popIconRight.alpha = 1.0;
+        }];
+    }
+}
+
+- (void)stackedViewDidStopDragging:(PSStackedViewController *)stackedView {
+    [UIView animateWithDuration:0.2 animations:^(void) {
+        self.popIconLeft.alpha = 0.0;
+        self.popIconRight.alpha = 0.0;
+        self.popIconRight.transform = CGAffineTransformIdentity;
+    }];
+}
+
+-(void)stackedView:(PSStackedViewController *)stackedView WillPopViewControllers:(NSArray *)controllers {
+    if([controllers count] > 0) {
+        [UIView animateWithDuration:0.2 animations:^(void) {
+            self.popIconRight.alpha = 0.5;
+            CGAffineTransform trans = CGAffineTransformMakeTranslation(40, 10);
+            trans = CGAffineTransformRotate(trans, M_PI/4);
+            self.popIconRight.transform = trans;
+        }];
+    }
+}
+
+- (void)stackedView:(PSStackedViewController *)stackedView WillNotPopViewControllers:(NSArray *)controllers {
+    if([controllers count] > 0) {
+        [UIView animateWithDuration:0.2 animations:^(void) {
+            self.popIconRight.alpha = 1.0;
+            self.popIconRight.transform = CGAffineTransformIdentity;
+        }];
+    }
+}
+
 @end

PSStackedView/PSStackedViewController.h

@@ -14,9 +14,16 @@
 enum {
     SVSnapOptionNearest,
     SVSnapOptionLeft,
-    SVSnapOptionRight
+    SVSnapOptionRight,
+    SVSnapOptionPopRight
 } typedef PSSVSnapOption;
 
+enum {
+    SVPopOptionAllButFirst,
+    SVPopOptionAll,
+    SVPopOptionTop
+} typedef PSSVPopOption;
+
 /// StackController hosing a backside rootViewController and the stacked controllers
 @interface PSStackedViewController : UIViewController
 
@@ -111,6 +118,15 @@ enum {
 /// Property to disable bounces
 @property(nonatomic, assign) BOOL enableBounces;
 
+/// Property to enable poping off all of the stack views except the first when dragged past a specified amount
+@property(nonatomic, assign) BOOL enablePopOffOnDragRight;
+
+/// Property to determine the type of pop off action that will be taken when entire stack is dragged to the right
+@property(nonatomic, assign) PSSVPopOption popOffType;
+
+/// Property to determine the distance the stack has to be dragged to the right to trigger popOff
+@property(nonatomic, assign) NSInteger popOffDragDistance;
+
 /// left inset thats always visible. Defaults to 60.
 @property(nonatomic, assign) NSUInteger leftInset;
 /// animate setting of the left inset that is always visible

PSStackedView/PSStackedViewController.m

@@ -18,6 +18,7 @@
 #define kPSSVStackAnimationPopDuration kPSSVStackAnimationSpeedModifier * 0.25f
 #define kPSSVMaxSnapOverOffset 20
 #define kPSSVAssociatedBaseViewControllerKey @"kPSSVAssociatedBaseViewController"
+#define kPSSVDefaultPopOffDragDistance 150
 
 // reduces alpha over overlapped view controllers. 1.f would totally black-out on complete overlay
 #define kAlphaReductRatio 10.f
@@ -35,11 +36,18 @@ @interface PSStackedViewController() <UIGestureRecognizerDelegate> {
     BOOL lastDragDividedOne_;
     NSInteger lastVisibleIndexBeforeRotation_;   
     BOOL enableBounces_;
+    BOOL enablePopOffOnDragRight_;
+    PSSVPopOption popOffType_;
+    NSInteger popOffDragDistance_;
     struct {
         unsigned int delegateWillInsertViewController:1;
         unsigned int delegateDidInsertViewController:1;
         unsigned int delegateWillRemoveViewController:1;
-        unsigned int delegateDidRemoveViewController:1;        
+        unsigned int delegateDidRemoveViewController:1;
+        unsigned int delegateDidStartDragging:1;
+        unsigned int delegateDidStopDragging:1;
+        unsigned int delegateWillPopViewControllers:1;
+        unsigned int delegateWillNotPopViewControllers:1;
     }delegateFlags_;
 }
 @property(nonatomic, strong) UIViewController *rootViewController;
@@ -60,6 +68,9 @@ @implementation PSStackedViewController
 @synthesize delegate = delegate_;
 @synthesize reduceAnimations = reduceAnimations_;
 @synthesize enableBounces = enableBounces_;
+@synthesize enablePopOffOnDragRight = enablePopOffOnDragRight_;
+@synthesize popOffType = popOffType_;
+@synthesize popOffDragDistance = popOffDragDistance_;
 @dynamic firstVisibleIndex;
 
 #ifdef ALLOW_SWIZZLING_NAVIGATIONCONTROLLER
@@ -79,6 +90,7 @@ - (id)initWithRootViewController:(UIViewController *)rootViewController; {
         // set some reasonble defaults
         leftInset_ = 60;
         largeLeftInset_ = 200;
+        popOffDragDistance_ = kPSSVDefaultPopOffDragDistance;
 
         // add a gesture recognizer to detect dragging to the guest controllers
         UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanFrom:)];
@@ -123,6 +135,10 @@ - (void)setDelegate:(id<PSStackedViewDelegate>)delegate {
         delegateFlags_.delegateDidInsertViewController = [delegate respondsToSelector:@selector(stackedView:didInsertViewController:)];
         delegateFlags_.delegateWillRemoveViewController = [delegate respondsToSelector:@selector(stackedView:willRemoveViewController:)];
         delegateFlags_.delegateDidRemoveViewController = [delegate respondsToSelector:@selector(stackedView:didRemoveViewController:)];
+        delegateFlags_.delegateDidStartDragging = [delegate respondsToSelector:@selector(stackedViewDidStartDragging:)];
+        delegateFlags_.delegateDidStopDragging = [delegate respondsToSelector:@selector(stackedViewDidStopDragging:)];
+        delegateFlags_.delegateWillPopViewControllers = [delegate respondsToSelector:@selector(stackedView:WillPopViewControllers:)];
+        delegateFlags_.delegateWillNotPopViewControllers = [delegate respondsToSelector:@selector(stackedView:WillNotPopViewControllers:)];
     }
 }
 
@@ -775,6 +791,9 @@ - (void)handlePanFrom:(UIPanGestureRecognizer *)recognizer {
 
     // set up designated drag destination
     if (state == UIGestureRecognizerStateBegan) {
+        if (delegateFlags_.delegateDidStartDragging) {
+            [delegate_ stackedViewDidStartDragging:self];
+        }
         if (offset > 0) {
             lastDragOption_ = SVSnapOptionRight;
         }else {
@@ -792,6 +811,44 @@ - (void)handlePanFrom:(UIPanGestureRecognizer *)recognizer {
         lastDragOffset_ = translatedPoint.x;
     }
 
+    if(self.enablePopOffOnDragRight && [viewControllers_ count] > 0) {
+        UIViewController* fvc = (UIViewController*)[viewControllers_ objectAtIndex:0];
+        NSInteger currentDragDistance = (fvc.containerView.left - largeLeftInset_);
+
+        if(currentDragDistance > popOffDragDistance_ && lastDragOption_ != SVSnapOptionPopRight) {
+            lastDragOption_ = SVSnapOptionPopRight;
+            if(delegateFlags_.delegateWillPopViewControllers) {
+                NSArray* toPop;
+                if(self.popOffType == SVPopOptionAll) {
+                    toPop = [self.viewControllers copy];
+                }
+                else if(self.popOffType == SVPopOptionAllButFirst) {
+                    toPop = [self.viewControllers subarrayWithRange:NSMakeRange(1, [self.viewControllers count] - 1)];
+                }
+                else if(self.popOffType == SVPopOptionTop) {
+                    toPop = [self.viewControllers subarrayWithRange:NSMakeRange([self.viewControllers count] - 1, 1)];
+                }
+                [delegate_ stackedView:self WillPopViewControllers:toPop];
+            }
+        }
+        else if(currentDragDistance < popOffDragDistance_ && lastDragOption_ == SVSnapOptionPopRight) {
+            lastDragOption_ = SVSnapOptionNearest;
+            if(delegateFlags_.delegateWillNotPopViewControllers) {
+                NSArray* toPop;
+                if(self.popOffType == SVPopOptionAll) {
+                    toPop = [self.viewControllers copy];
+                }
+                else if(self.popOffType == SVPopOptionAllButFirst) {
+                    toPop = [self.viewControllers subarrayWithRange:NSMakeRange(1, [self.viewControllers count] - 1)];
+                }
+                else if(self.popOffType == SVPopOptionTop) {
+                    toPop = [self.viewControllers subarrayWithRange:NSMakeRange([self.viewControllers count] - 1, 1)];
+                }
+                [delegate_ stackedView:self WillNotPopViewControllers:toPop];
+            }
+        }
+    }
+
     // perform snapping after gesture ended
     BOOL gestureEnded = state == UIGestureRecognizerStateEnded;
     if (gestureEnded) {
@@ -800,11 +857,30 @@ - (void)handlePanFrom:(UIPanGestureRecognizer *)recognizer {
             self.floatIndex = [self nearestValidFloatIndex:self.floatIndex round:PSSVRoundDown];
         }else if(lastDragOption_ == SVSnapOptionLeft) {
             self.floatIndex = [self nearestValidFloatIndex:self.floatIndex round:PSSVRoundUp];
-        }else {
+        }else if(lastDragOption_ == SVSnapOptionPopRight) {
+            self.floatIndex = 0.0;
+            if(self.popOffType == SVPopOptionAll) {
+                [self popToRootViewControllerAnimated:YES];
+            }
+            else if(self.popOffType == SVPopOptionAllButFirst) {
+                [self popToViewController:[self.viewControllers objectAtIndex:0] animated:YES];
+            }
+            else if(self.popOffType == SVPopOptionTop) {
+                if([self.viewControllers count] == 1) 
+                    [self popToRootViewControllerAnimated:YES];
+                else 
+                    [self popToViewController:[self.viewControllers objectAtIndex:[self.viewControllers count]-2] animated:YES];
+            }
+        }
+        else {
             self.floatIndex = [self nearestValidFloatIndex:self.floatIndex round:PSSVRoundNearest];
         }
 
         [self alignStackAnimated:YES];
+
+        if(delegateFlags_.delegateDidStopDragging) {
+            [delegate_ stackedViewDidStopDragging:self];
+        }
     }
 }
 

PSStackedView/PSStackedViewDelegate.h

@@ -26,4 +26,16 @@
 /// viewController has been removed
 - (void)stackedView:(PSStackedViewController *)stackedView didRemoveViewController:(UIViewController *)viewController;
 
+/// stackcontroller will pop off view controllers because of drag to right
+- (void)stackedView:(PSStackedViewController*)stackedView WillPopViewControllers:(NSArray*)controllers;
+
+/// stackcontroller will no longer pop off view controllers because of drag to right
+- (void)stackedView:(PSStackedViewController *)stackedView WillNotPopViewControllers:(NSArray*)controllers;
+
+/// stackcontroller did start dragging stack
+- (void)stackedViewDidStartDragging:(PSStackedViewController*)stackedView;
+
+/// stackcontroller did stop dragging stack
+- (void)stackedViewDidStopDragging:(PSStackedViewController*)stackedView;
+
 @end

README.md

@@ -37,6 +37,12 @@ window.rootViewController = self.stackController;
 
 PSStackedViewRootController's rootViewController is in the background and its left part is always visible. Adjust the size with leftInset and largeLeftInset.
 
+PS: Added "Remove top view controller if user slides stack to the right"
+
+Code by: [mball-crrc](https://github.com/mball-crrc/PSStackedView/tree/feature/pop_off_on_drag_right)
+
+Pull merge by: [fabiosoft](https://github.com/fabiosoft) - [website](http://www.fabiosoft.com)
+
 ## Roadmap
 - Add (conditional) support for the new child view controller system in iOS5
 - Appledoc