modify navigation

MHCustomTabBarController/MHCustomTabBarController.m

@@ -40,43 +40,37 @@ - (void)viewDidLoad {
     [super viewDidLoad];
 
     self.viewControllersByIdentifier = [NSMutableDictionary dictionary];
-    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(newViewControllerWillShow:) name:MHNavigationControllerViewControllerWillShowNotification object:nil];
-    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(newViewControllerDidShow:) name:MHNavigationControllerViewControllerDidShowNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushViewController:) name:MHTabBarControllerViewControllerPushNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(popViewController:) name:MHTabBarControllerViewControllerPopNotification object:nil];
 }
 
-- (void)newViewControllerWillShow:(NSNotification *)noti
+- (void)pushViewController:(NSNotification *)noti
 {
     UIViewController *notiViewController = noti.object;
     MHNavigationController *nav = (MHNavigationController *)self.destinationViewController;
     UIViewController *rootViewController = [[nav viewControllers] objectAtIndex:0];
     if (![notiViewController isEqual:rootViewController]) {
         [rootViewController.view addSubview:self.tabbar];
-    } else {
-
     }
     [self tabbarConstraint];
-
 }
 
-- (void)tabbarConstraint
+- (void)popViewController:(NSNotification *)noti
 {
-    self.tabbar.translatesAutoresizingMaskIntoConstraints = NO;
-    NSLayoutConstraint *constraint1 = [NSLayoutConstraint constraintWithItem:self.tabbar attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.tabbar.superview attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
-    [self.tabbar.superview addConstraint:constraint1];
-}
-
-- (void)newViewControllerDidShow:(NSNotification *)noti
-{
-    UIViewController *notiViewController = noti.object;
     MHNavigationController *nav = (MHNavigationController *)self.destinationViewController;
-    UIViewController *rootViewController = [[nav viewControllers] objectAtIndex:0];
-
-    if ([notiViewController isEqual:rootViewController]) {
+    if ([[nav viewControllers] count] <= 1) {
         [self.view addSubview:self.tabbar];
     }
     [self tabbarConstraint];
 }
 
+- (void)tabbarConstraint
+{
+    self.tabbar.translatesAutoresizingMaskIntoConstraints = NO;
+    NSLayoutConstraint *constraint1 = [NSLayoutConstraint constraintWithItem:self.tabbar attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.tabbar.superview attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
+    [self.tabbar.superview addConstraint:constraint1];
+}
+
 -(void) viewWillAppear:(BOOL)animated {
     [super viewWillAppear:animated];
 

MHCustomTabBarController/MHNavigationController.h

@@ -1,17 +1,19 @@
 //
-//  MHNavigationController.h
-//  MHCustomTabBarControllerDemo
+//  MLNavigationController.h
+//  MultiLayerNavigation
 //
-//  Created by Vienta on 14/11/22.
-//  Copyright (c) 2014年 Martin Hartl. All rights reserved.
+//  Created by Feather Chan on 13-4-12.
+//  Copyright (c) 2013年 Feather Chan. All rights reserved.
 //
 
 #import <UIKit/UIKit.h>
 
+extern NSString *const MHTabBarControllerViewControllerPushNotification;
+extern NSString *const MHTabBarControllerViewControllerPopNotification;
 
-extern NSString *const MHNavigationControllerViewControllerWillShowNotification;
-extern NSString *const MHNavigationControllerViewControllerDidShowNotification;
+@interface MHNavigationController : UINavigationController <UIGestureRecognizerDelegate>
 
-@interface MHNavigationController : UINavigationController<UINavigationControllerDelegate>
+// Enable the drag to back interaction, Defalt is YES.
+@property (nonatomic,assign) BOOL canDragBack;
 
 @end

MHCustomTabBarController/MHNavigationController.m

@@ -1,79 +1,261 @@
 //
-//  MHNavigationController.m
-//  MHCustomTabBarControllerDemo
+//  MLNavigationController.m
+//  MultiLayerNavigation
 //
-//  Created by Vienta on 14/11/22.
-//  Copyright (c) 2014年 Martin Hartl. All rights reserved.
+//  Created by Feather Chan on 13-4-12.
+//  Copyright (c) 2013年 Feather Chan. All rights reserved.
 //
 
+#define KEY_WINDOW  [[UIApplication sharedApplication]keyWindow]
+#define TOP_VIEW  [[UIApplication sharedApplication]keyWindow].rootViewController.view
+
+
 #import "MHNavigationController.h"
+#import <QuartzCore/QuartzCore.h>
 
-NSString *const MHNavigationControllerViewControllerWillShowNotification = @"kMHNavigationControllerViewControllerWillShowNotification";
-NSString *const MHNavigationControllerViewControllerDidShowNotification = @"kMHNavigationControllerViewControllerDidShowNotification";
+NSString *const MHTabBarControllerViewControllerPushNotification = @"MHTabBarControllerViewControllerPushNotification";
+NSString *const MHTabBarControllerViewControllerPopNotification = @"MHTabBarControllerViewControllerPopNotification";
 
 @interface MHNavigationController ()
+{
+    CGPoint startTouch;
+
+    UIImageView *lastScreenShotView;
+    UIView *blackMask;
+}
+
+@property (nonatomic,retain) UIView *backgroundView;
+@property (nonatomic,retain) NSMutableArray *screenShotsList;
+
+@property (nonatomic,assign) BOOL isMoving;
 
 @end
 
 @implementation MHNavigationController
 
-- (void)viewDidLoad {
+- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
+{
+    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
+    if (self) {
+        // Custom initialization
+        [self setUp];
+    }
+    return self;
+}
+
+- (void)setUp
+{
+    self.screenShotsList = [[NSMutableArray alloc]initWithCapacity:2];
+    self.canDragBack = YES;
+}
+
+- (void)dealloc
+{
+    self.screenShotsList = nil;
+
+    [self.backgroundView removeFromSuperview];
+    self.backgroundView = nil;
+}
+
+- (void)viewDidLoad
+{
     [super viewDidLoad];
     // Do any additional setup after loading the view.
+    [self setUp];
+    // draw a shadow for navigation view to differ the layers obviously.
+    // using this way to draw shadow will lead to the low performace
+    // the best alternative way is making a shadow image.
+    //
+    //self.view.layer.shadowColor = [[UIColor blackColor]CGColor];
+    //self.view.layer.shadowOffset = CGSizeMake(5, 5);
+    //self.view.layer.shadowRadius = 5;
+    //self.view.layer.shadowOpacity = 1;
     if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) {
-        self.interactivePopGestureRecognizer.delegate = nil;
+        self.interactivePopGestureRecognizer.enabled = NO;
     }
-    self.delegate = (id)self;
+    UIImageView *shadowImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"leftside_shadow_bg"]];
+    shadowImageView.frame = CGRectMake(-10, 0, 10, TOP_VIEW.frame.size.height);
+    [TOP_VIEW addSubview:shadowImageView];
+
+    UIPanGestureRecognizer *recognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self
+                                                                                 action:@selector(paningGestureReceive:)];
+    recognizer.delegate = self;
+    [recognizer delaysTouchesBegan];
+    [self.view addGestureRecognizer:recognizer];
 }
 
-- (void)didReceiveMemoryWarning {
+- (void)didReceiveMemoryWarning
+{
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }
 
-- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
+- (void)viewDidAppear:(BOOL)animated
 {
-    NSLog(@"~~~~~~~~~~~~will show:%@", viewController);
-    [[NSNotificationCenter defaultCenter] postNotificationName:MHNavigationControllerViewControllerWillShowNotification object:viewController];
+    [super viewDidAppear:(BOOL)animated];
+
+    if (self.screenShotsList.count == 0) {
+
+        UIImage *capturedImage = [self capture];
+
+        if (capturedImage) {
+            [self.screenShotsList addObject:capturedImage];
+        }
+    }
 }
 
-- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
+// override the push method
+- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
 {
-    NSLog(@"~~~~~~~~~~~~did show:%@", viewController);
-    [[NSNotificationCenter defaultCenter] postNotificationName:MHNavigationControllerViewControllerDidShowNotification object:viewController];
+    UIImage *capturedImage = [self capture];
+
+    if (capturedImage) {
+        [self.screenShotsList addObject:capturedImage];
+    }
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:MHTabBarControllerViewControllerPushNotification object:viewController];
+    });
+
+    [super pushViewController:viewController animated:animated];
 }
-/*
-- (NSUInteger)navigationControllerSupportedInterfaceOrientations:(UINavigationController *)navigationController
+
+// override the pop method
+- (UIViewController *)popViewControllerAnimated:(BOOL)animated
 {
-    NSLog(@"~~~~~~~~~~~~%s", __PRETTY_FUNCTION__);
+    [self.screenShotsList removeLastObject];
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:MHTabBarControllerViewControllerPopNotification object:nil];
+    });
+
+    return [super popViewControllerAnimated:animated];
 }
-- (UIInterfaceOrientation)navigationControllerPreferredInterfaceOrientationForPresentation:(UINavigationController *)navigationController
+
+#pragma mark - Utility Methods -
+
+// get the current view screen shot
+- (UIImage *)capture
 {
-    NSLog(@"~~~~~~~~~~~~%s", __PRETTY_FUNCTION__);
+    UIGraphicsBeginImageContextWithOptions(TOP_VIEW.bounds.size, TOP_VIEW.opaque, 0.0);
+    [TOP_VIEW.layer renderInContext:UIGraphicsGetCurrentContext()];
+
+    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
+
+    UIGraphicsEndImageContext();
+
+    return img;
 }
 
-- (id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
-                          interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController
+// set lastScreenShotView 's position and alpha when paning
+- (void)moveViewWithX:(float)x
 {
-    NSLog(@"~~~~~~~~~~~~%s", __PRETTY_FUNCTION__);
+    x = x>320?320:x;
+    x = x<0?0:x;
+
+    CGRect frame = TOP_VIEW.frame;
+    frame.origin.x = x;
+    TOP_VIEW.frame = frame;
+
+    float scale = (x/6400)+0.95;
+    float alpha = 0.4 - (x/800);
+
+    lastScreenShotView.transform = CGAffineTransformMakeScale(scale, scale);
+    blackMask.alpha = alpha;
+
 }
 
-- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
-                                   animationControllerForOperation:(UINavigationControllerOperation)operation
-                                                fromViewController:(UIViewController *)fromVC
-                                                  toViewController:(UIViewController *)toVC
-{
-    NSLog(@"~~~~~~~~~~~~%s", __PRETTY_FUNCTION__);
-}*/
+#pragma mark - UIGestureRecognizerDelegate
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
+    if (self.viewControllers.count <= 1 || !self.canDragBack) return NO;
+
+    return YES;
+}
 
-/*
-#pragma mark - Navigation
+#pragma mark - Gesture Recognizer -
 
-// In a storyboard-based application, you will often want to do a little preparation before navigation
-- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
-    // Get the new view controller using [segue destinationViewController].
-    // Pass the selected object to the new view controller.
+- (void)paningGestureReceive:(UIPanGestureRecognizer *)recoginzer
+{
+    // If the viewControllers has only one vc or disable the interaction, then return.
+    if (self.viewControllers.count <= 1 || !self.canDragBack) return;
+
+    // we get the touch position by the window's coordinate
+    CGPoint touchPoint = [recoginzer locationInView:KEY_WINDOW];
+
+    // begin paning, show the backgroundView(last screenshot),if not exist, create it.
+    if (recoginzer.state == UIGestureRecognizerStateBegan) {
+
+        _isMoving = YES;
+        startTouch = touchPoint;
+
+        if (!self.backgroundView)
+        {
+            CGRect frame = TOP_VIEW.frame;
+
+            self.backgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, frame.size.width , frame.size.height)];
+            [TOP_VIEW.superview insertSubview:self.backgroundView belowSubview:TOP_VIEW];
+
+            blackMask = [[UIView alloc]initWithFrame:CGRectMake(0, 0, frame.size.width , frame.size.height)];
+            blackMask.backgroundColor = [UIColor blackColor];
+            [self.backgroundView addSubview:blackMask];
+        }
+
+        self.backgroundView.hidden = NO;
+
+        if (lastScreenShotView) [lastScreenShotView removeFromSuperview];
+
+        UIImage *lastScreenShot = [self.screenShotsList lastObject];
+        lastScreenShotView = [[UIImageView alloc]initWithImage:lastScreenShot];
+        [self.backgroundView insertSubview:lastScreenShotView belowSubview:blackMask];
+
+        //End paning, always check that if it should move right or move left automatically
+    }else if (recoginzer.state == UIGestureRecognizerStateEnded){
+
+        if (touchPoint.x - startTouch.x > 50)
+        {
+            [UIView animateWithDuration:0.3 animations:^{
+                [self moveViewWithX:320];
+            } completion:^(BOOL finished) {
+
+                [self popViewControllerAnimated:NO];
+                CGRect frame = TOP_VIEW.frame;
+                frame.origin.x = 0;
+                TOP_VIEW.frame = frame;
+
+                _isMoving = NO;
+                self.backgroundView.hidden = YES;
+
+            }];
+        }
+        else
+        {
+            [UIView animateWithDuration:0.3 animations:^{
+                [self moveViewWithX:0];
+            } completion:^(BOOL finished) {
+                _isMoving = NO;
+                self.backgroundView.hidden = YES;
+            }];
+
+        }
+        return;
+
+        // cancal panning, alway move to left side automatically
+    }else if (recoginzer.state == UIGestureRecognizerStateCancelled){
+
+        [UIView animateWithDuration:0.3 animations:^{
+            [self moveViewWithX:0];
+        } completion:^(BOOL finished) {
+            _isMoving = NO;
+            self.backgroundView.hidden = YES;
+        }];
+
+        return;
+    }
+
+    // it keeps move with touch
+    if (_isMoving) {
+        [self moveViewWithX:touchPoint.x - startTouch.x];
+    }
 }
-*/
 
 @end