I implement SWRevealViewController with UITabbarController via storyboard.
I want to display SWRevealViewController in first UITabBarItem only, in other UITabBarItem i don't want to open SWRevealViewController, that done completely.
But problem is position of UITabBar is not change like viewcontroller while SWRevealViewController is appear.
Please help me.
Storyboard structure
I solve the problem by change position of UITabbar manually using SWRevealViewController delegate method.
Put this code in MenuViewController.
MenuViewController.m
- (void) viewDidLoad {
[super viewDidLoad];
UITabBarController *tbc = (UITabBarController *)[[[[UIApplication sharedApplication]delegate]window]rootViewController];
self.tabBar = tbc.tabBar;
_tabBar.frame = CGRectMake(self.revealViewController.rearViewRevealWidth, _tabBar.frame.origin.y, _tabBar.frame.size.width, _tabBar.frame.size.height);
self.revealViewController.delegate = self;
}
- (void) revealController:(SWRevealViewController *)revealController willMoveToPosition:(FrontViewPosition)position {
if (position == FrontViewPositionRight) {
_tabBar.frame = CGRectMake(self.revealViewController.rearViewRevealWidth, _tabBar.frame.origin.y, _tabBar.frame.size.width, _tabBar.frame.size.height);
}
else {
_tabBar.frame = CGRectMake(0, _tabBar.frame.origin.y, _tabBar.frame.size.width, _tabBar.frame.size.height);
}
}
- (void)revealController:(SWRevealViewController *)revealController panGestureMovedToLocation:(CGFloat)location progress:(CGFloat)progress overProgress:(CGFloat)overProgress {
_tabBar.frame = CGRectMake(self.revealViewController.rearViewRevealWidth * progress, _tabBar.frame.origin.y, _tabBar.frame.size.width, _tabBar.frame.size.height);
}
Related
When a user segues to a second VC from within a starting VC that is embedded in a UITabBarController, I change the title of the UITabbarItem with some code placed in the viewWillAppear method of the second view controller.
//Second VC, View WIll Appear
UITabBarItem *selectedItem = self.tabBarController.tabBar.selectedItem;
if (selectedItem) {
selectedItem.title = #"VoiceMail";
}
This works fine.
When the user returns to the starting view controller, I want to switch the title back.
I tried to do this by placing similar code in the view will appear method of the starting view controller.
Starting VC: ViewWIllAppear
UITabBarItem *selectedItem = self.tabBarController.tabBar.selectedItem;
if (selectedItem) {
selectedItem.title = #"Phone";
}
But it is having no effect, leaving the title as Voicemail.
WOuld appreciate any suggestions on how to change back to initial value.
Thanks for any suggestions.
Trying to change the "2nd" tab title by referencing .selectedItem in your "Starting VC" won't work, because at that point .selectedItem is StartingVC.
One approach would be to save a reference to the index of SecondVC... then, inside that VC, on viewWillDisappear you can reset its tab's title:
This is all in SecondVC:
#import "ChangeSecondViewController.h"
#interface ChangeSecondViewController ()
#property (assign, readwrite) NSInteger myTabIndex;
#end
#implementation ChangeSecondViewController
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
UITabBarItem *selectedItem = self.tabBarController.tabBar.selectedItem;
if (selectedItem) {
selectedItem.title = #"VoiceMail";
}
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
_myTabIndex = self.tabBarController.selectedIndex;
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
UITabBarItem *myTabItem = [[self.tabBarController.tabBar items] objectAtIndex:_myTabIndex];
if (myTabItem) {
myTabItem.title = #"Phone";
}
}
#end
I am trying to use the SWRevealViewController without a storyboard and with a UIButton. My project has two UIViewControllers with nib's. The main one is called ViewController and the other is called MenuViewController.
In my ViewController I have the following code:
- (void)viewDidLoad {
[super viewDidLoad];
MenuViewController *menuView;
SWRevealViewController *revealViewController = [[SWRevealViewController alloc] initWithRearViewController:menuView frontViewController:self];
if ( revealViewController )
{
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
}
}
- (IBAction)toggleMenu:(id)sender {
NSLog(#"Toggling menu");
SWRevealViewController *revealController = self.revealViewController;
[revealController rightRevealToggleAnimated:YES];
}
The toggle menu button prints "Toggling Menu" as expected but doesn't reveal the menu controller. I know this isn't the conventional way of using the SWRevealViewController but does someone have any ideas how to get this to work ?
Add below line in viewDidLoad()
self.revealViewController.delegate = self;
Here are two methods I use to set up the two (left and right) view controllers for SWRevealViewController. Just call them in viewDidLoad.
-(void) initSlideMenu
{
SWRevealViewController * menuViewController = (SWRevealViewController *)self.revealViewController;
if (menuViewController)
{
[_menuButton setTarget:self.revealViewController];
[_menuButton setAction:#selector(revealToggle:)];
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
}
}
-(void) initRightMenu
{
SWRevealViewController * rightViewController = (SWRevealViewController *)self.revealViewController;
if (rightViewController)
{
rightViewController.rightViewRevealOverdraw =0.0f;
[_notificationButton setTarget:self.revealViewController];
[_notificationButton setAction:#selector(rightRevealToggle:)];
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
}
}
You can try this one with some modifications. It helped in my case.
- (IBAction)toggleMenu:(id)sender{
[self.btn addTarget:self.revealViewController action:#selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];
}
I create a subclass of UINavigationController, like this
#interface CustomNav : UINavigationController
#property(assign , nonatomic) BOOL canBack;
#end
#implementation CustomNav
- (void)viewDidLoad {
[super viewDidLoad];
self.canBack = YES;
// Do any additional setup after loading the view.
id target = self.interactivePopGestureRecognizer.delegate;
UIPanGestureRecognizer * pan = [[UIPanGestureRecognizer alloc]
initWithTarget:target action:#selector(handleNavigationTransition:)];
pan.delegate = self;
[self.view addGestureRecognizer:pan];
self.interactivePopGestureRecognizer.enabled = NO;
}
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
// NSLog(#"self.childViewControllers.count = %li",self.childViewControllers.count);
if (self.childViewControllers.count==1||!self.canBack) {
return NO;
}
return YES;
}
#end
but when i use it to push viewController , the navigationBar display deranged ,for example, it has A viewController, then it push another B viewController,but sometimes, it doesn't display the navigationItem of B , it just display the navigationItem of A , and then I push C to the CustomNav , it also display the navigationItem of A. i don't know why ,i found it seems the CustomNav display the navigationItem of B(or C) ，and then the navigationBar covered by the navigationItem of A . Could everyOne help me ? Thank you ever so much.
I have an iOS 7 app where I am setting a custom back button like this:
UIImage *backButtonImage = [UIImage imageNamed:#"back-button"];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:backButtonImage forState:UIControlStateNormal];
backButton.frame = CGRectMake(0, 0, 20, 20);
[backButton addTarget:self
action:#selector(popViewController)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
viewController.navigationItem.leftBarButtonItem = backBarButtonItem;
But this disables the iOS 7 "swipe left to right" gesture to navigate to the previous controller. Does anyone know how I can set a custom button and still keep this gesture enabled?
EDIT:
I tried to set the viewController.navigationItem.backBarButtonItem instead, but this doesn't seem to show my custom image.
IMPORTANT:
This is a hack. I would recommend taking a look at this answer.
Calling the following line after assigning the leftBarButtonItem worked for me:
self.navigationController.interactivePopGestureRecognizer.delegate = self;
Edit:
This does not work if called in init methods. It should be called in viewDidLoad or similar methods.
Use the backIndicatorImage and backIndicatorTransitionMaskImage properties of the UINavigationBar if at all possible. Setting these on an a UIAppearanceProxy can easily modify behavior across your application. The wrinkle is that you can only set those on ios 7, but that works out because you can only use the pop gesture on ios 7 anyway. Your normal ios 6 styling can remain intact.
UINavigationBar* appearanceNavigationBar = [UINavigationBar appearance];
//the appearanceProxy returns NO, so ask the class directly
if ([[UINavigationBar class] instancesRespondToSelector:#selector(setBackIndicatorImage:)])
{
appearanceNavigationBar.backIndicatorImage = [UIImage imageNamed:#"back"];
appearanceNavigationBar.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
//sets back button color
appearanceNavigationBar.tintColor = [UIColor whiteColor];
}else{
//do ios 6 customization
}
Trying to manipulate the interactivePopGestureRecognizer's delegate will lead to a lot of issues.
I saw this solution http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/ which subclasses UINavigationController. Its a better solution as it handles the case where you swipe before the controller is in place - which causes a crash.
In addition to this I noticed if you do a swipe on the root view controller (after pushing on one, and back again) the UI becomes unresponsive (also same problem in answer above).
So the code in the subclassed UINavigationController should look like so:
#implementation NavigationController
- (void)viewDidLoad {
[super viewDidLoad];
__weak NavigationController *weakSelf = self;
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.delegate = weakSelf;
self.delegate = weakSelf;
}
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
// Hijack the push method to disable the gesture
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.enabled = NO;
}
[super pushViewController:viewController animated:animated];
}
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animate {
// Enable the gesture again once the new controller is shown
self.interactivePopGestureRecognizer.enabled = ([self respondsToSelector:#selector(interactivePopGestureRecognizer)] && [self.viewControllers count] > 1);
}
#end
I use
[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:#"nav_back.png"]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:#"nav_back.png"]];
[UIBarButtonItem.appearance setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -64) forBarMetrics:UIBarMetricsDefault];
Here is swift3 version of Nick H247's answer
class NavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
interactivePopGestureRecognizer?.delegate = self
delegate = self
}
}
override func pushViewController(_ viewController: UIViewController, animated: Bool) {
if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
interactivePopGestureRecognizer?.isEnabled = false
}
super.pushViewController(viewController, animated: animated)
}
}
extension NavigationController: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
interactivePopGestureRecognizer?.isEnabled = (responds(to: #selector(getter: interactivePopGestureRecognizer)) && viewControllers.count > 1)
}
}
extension NavigationController: UIGestureRecognizerDelegate {}
I also hide the back button, replacing it with a custom leftBarItem.
Removing interactivePopGestureRecognizer delegate after push action worked for me:
[self.navigationController pushViewController:vcToPush animated:YES];
// Enabling iOS 7 screen-edge-pan-gesture for pop action
if ([self.navigationController respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}
navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
This is from http://stuartkhall.com/posts/ios-7-development-tips-tricks-hacks, but it causes several bugs:
Push another viewController into the navigationController when swiping in from the left edge of the screen;
Or, swipe in from the left edge of the screen when the topViewController is popping up from the navigationController;
e.g. When the rootViewController of navigationController is showing, swipe in from the left edge of the screen, and tap something(QUICKLY) to push anotherViewController into the navigationController, then
The rootViewController does not respond any touch event;
The anotherViewController will not be shown;
Swipe from the edge of the screen again, the anotherViewController will be shown;
Tap the custom back button to pop the anotherViewController, crash!
So you must implement UIGestureRecognizerDelegate method in self.navigationController.interactivePopGestureRecognizer.delegate like this:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if (gestureRecognizer == navigationController.interactivePopGestureRecognizer) {
return !navigationController.<#TODO: isPushAnimating#> && [navigationController.viewControllers count] > 1;
}
return YES;
}
Try self.navigationController.interactivePopGestureRecognizer.enabled = YES;
I did not write this, but the following blog helped a lot and solved my issues with custom navigation button:
http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/
In summary, he implements a custom UINavigationController that uses the pop gesture delegate. Very clean and portable!
Code:
#interface CBNavigationController : UINavigationController <UINavigationControllerDelegate, UIGestureRecognizerDelegate>
#end
#implementation CBNavigationController
- (void)viewDidLoad
{
__weak CBNavigationController *weakSelf = self;
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
{
self.interactivePopGestureRecognizer.delegate = weakSelf;
self.delegate = weakSelf;
}
}
// Hijack the push method to disable the gesture
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
self.interactivePopGestureRecognizer.enabled = NO;
[super pushViewController:viewController animated:animated];
}
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animate
{
// Enable the gesture again once the new controller is shown
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
self.interactivePopGestureRecognizer.enabled = YES;
}
Edit. Added fix for problems when a user tries to swipe left on a root view controller:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)] &&
self.topViewController == [self.viewControllers firstObject] &&
gestureRecognizer == self.interactivePopGestureRecognizer) {
return NO;
}
return YES;
}
RootView
override func viewDidAppear(_ animated: Bool) {
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false
}
ChildView
override func viewDidLoad() {
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}
extension ChildViewController: UIGestureRecognizerDelegate {}
Use this logic to keep enable or disable the swipe gesture..
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animate
{
if ([self.navigationController respondsToSelector:#selector(interactivePopGestureRecognizer)])
{
if (self.navigationController.viewControllers.count > 1)
{
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
else
{
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
}
I had a similar problem where I was assigning the current view controller as the delegate for the interactive pop gesture, but would break the gesture on any views pushed, or views underneath the view in the nav stack. The way I solved this was to set the delegate in -viewDidAppear, then set it to nil in -viewWillDisappear. That allowed my other views to work correctly.
Imagine we are using Apple's default master/detail project template, where master is a table view controller and tapping on it will show the detail view controller.
We want to customize the back button that appears in the detail view controller. This is how to customize the image, image color, text, text color, and font of the back button.
To change the image, image color, text color, or font globally, place the following in a location that is called before any of your view controllers are created (e.g. application:didFinishLaunchingWithOptions: is a good place).
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UINavigationBar* navigationBarAppearance = [UINavigationBar appearance];
// change the back button, using default tint color
navigationBarAppearance.backIndicatorImage = [UIImage imageNamed:#"back"];
navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
// change the back button, using the color inside the original image
navigationBarAppearance.backIndicatorImage = [[UIImage imageNamed:#"back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
// change the tint color of everything in a navigation bar
navigationBarAppearance.tintColor = [UIColor greenColor];
// change the font in all toolbar buttons
NSDictionary *barButtonTitleTextAttributes =
#{
NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Light" size:12.0],
NSForegroundColorAttributeName: [UIColor purpleColor]
};
[[UIBarButtonItem appearance] setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];
return YES;
}
Note, you can use appearanceWhenContainedIn: to have more control over which view controllers are affected by these changes, but keep in mind that you can't pass [DetailViewController class], because it is contained inside a UINavigationController, not your DetailViewController. This means you will need to subclass UINavigationController if you want more control over what is affected.
To customize the text or the font/color of a specific back button item, you must do so in the MasterViewController (not the DetailViewController!). This seems unintuitive because the button appears on the DetailViewController. However once you understand that the way to customize it is by setting a property on a navigationItem, it begins to make more sense.
- (void)viewDidLoad { // MASTER view controller
[super viewDidLoad];
UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithTitle:#"Testing"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
NSDictionary *barButtonTitleTextAttributes =
#{
NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Light" size:12.0],
NSForegroundColorAttributeName: [UIColor purpleColor]
};
[buttonItem setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];
self.navigationItem.backBarButtonItem = buttonItem;
}
Note: attempting to set the titleTextAttributes after setting self.navigationItem.backBarButtonItem doesn't seem to work, so they must be set before you assign the value to this property.
Create a class 'TTNavigationViewController' which is subclass of 'UINavigationController' and make your existing navigation controller of this class either in storyboard/class, Example code in class -
class TTNavigationViewController: UINavigationController, UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.setNavigationBarHidden(true, animated: false)
// enable slide-back
if self.responds(to: #selector(getter: UINavigationController.interactivePopGestureRecognizer)) {
self.interactivePopGestureRecognizer?.isEnabled = true
self.interactivePopGestureRecognizer?.delegate = self
}
}
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}}
I have an iOS 7 app where I am setting a custom back button like this:
UIImage *backButtonImage = [UIImage imageNamed:#"back-button"];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:backButtonImage forState:UIControlStateNormal];
backButton.frame = CGRectMake(0, 0, 20, 20);
[backButton addTarget:self
action:#selector(popViewController)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
viewController.navigationItem.leftBarButtonItem = backBarButtonItem;
But this disables the iOS 7 "swipe left to right" gesture to navigate to the previous controller. Does anyone know how I can set a custom button and still keep this gesture enabled?
EDIT:
I tried to set the viewController.navigationItem.backBarButtonItem instead, but this doesn't seem to show my custom image.
IMPORTANT:
This is a hack. I would recommend taking a look at this answer.
Calling the following line after assigning the leftBarButtonItem worked for me:
self.navigationController.interactivePopGestureRecognizer.delegate = self;
Edit:
This does not work if called in init methods. It should be called in viewDidLoad or similar methods.
Use the backIndicatorImage and backIndicatorTransitionMaskImage properties of the UINavigationBar if at all possible. Setting these on an a UIAppearanceProxy can easily modify behavior across your application. The wrinkle is that you can only set those on ios 7, but that works out because you can only use the pop gesture on ios 7 anyway. Your normal ios 6 styling can remain intact.
UINavigationBar* appearanceNavigationBar = [UINavigationBar appearance];
//the appearanceProxy returns NO, so ask the class directly
if ([[UINavigationBar class] instancesRespondToSelector:#selector(setBackIndicatorImage:)])
{
appearanceNavigationBar.backIndicatorImage = [UIImage imageNamed:#"back"];
appearanceNavigationBar.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
//sets back button color
appearanceNavigationBar.tintColor = [UIColor whiteColor];
}else{
//do ios 6 customization
}
Trying to manipulate the interactivePopGestureRecognizer's delegate will lead to a lot of issues.
I saw this solution http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/ which subclasses UINavigationController. Its a better solution as it handles the case where you swipe before the controller is in place - which causes a crash.
In addition to this I noticed if you do a swipe on the root view controller (after pushing on one, and back again) the UI becomes unresponsive (also same problem in answer above).
So the code in the subclassed UINavigationController should look like so:
#implementation NavigationController
- (void)viewDidLoad {
[super viewDidLoad];
__weak NavigationController *weakSelf = self;
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.delegate = weakSelf;
self.delegate = weakSelf;
}
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
// Hijack the push method to disable the gesture
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.interactivePopGestureRecognizer.enabled = NO;
}
[super pushViewController:viewController animated:animated];
}
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animate {
// Enable the gesture again once the new controller is shown
self.interactivePopGestureRecognizer.enabled = ([self respondsToSelector:#selector(interactivePopGestureRecognizer)] && [self.viewControllers count] > 1);
}
#end
I use
[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:#"nav_back.png"]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:#"nav_back.png"]];
[UIBarButtonItem.appearance setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -64) forBarMetrics:UIBarMetricsDefault];
Here is swift3 version of Nick H247's answer
class NavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
interactivePopGestureRecognizer?.delegate = self
delegate = self
}
}
override func pushViewController(_ viewController: UIViewController, animated: Bool) {
if responds(to: #selector(getter: interactivePopGestureRecognizer)) {
interactivePopGestureRecognizer?.isEnabled = false
}
super.pushViewController(viewController, animated: animated)
}
}
extension NavigationController: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
interactivePopGestureRecognizer?.isEnabled = (responds(to: #selector(getter: interactivePopGestureRecognizer)) && viewControllers.count > 1)
}
}
extension NavigationController: UIGestureRecognizerDelegate {}
I also hide the back button, replacing it with a custom leftBarItem.
Removing interactivePopGestureRecognizer delegate after push action worked for me:
[self.navigationController pushViewController:vcToPush animated:YES];
// Enabling iOS 7 screen-edge-pan-gesture for pop action
if ([self.navigationController respondsToSelector:#selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.delegate = nil;
}
navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
This is from http://stuartkhall.com/posts/ios-7-development-tips-tricks-hacks, but it causes several bugs:
Push another viewController into the navigationController when swiping in from the left edge of the screen;
Or, swipe in from the left edge of the screen when the topViewController is popping up from the navigationController;
e.g. When the rootViewController of navigationController is showing, swipe in from the left edge of the screen, and tap something(QUICKLY) to push anotherViewController into the navigationController, then
The rootViewController does not respond any touch event;
The anotherViewController will not be shown;
Swipe from the edge of the screen again, the anotherViewController will be shown;
Tap the custom back button to pop the anotherViewController, crash!
So you must implement UIGestureRecognizerDelegate method in self.navigationController.interactivePopGestureRecognizer.delegate like this:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if (gestureRecognizer == navigationController.interactivePopGestureRecognizer) {
return !navigationController.<#TODO: isPushAnimating#> && [navigationController.viewControllers count] > 1;
}
return YES;
}
Try self.navigationController.interactivePopGestureRecognizer.enabled = YES;
I did not write this, but the following blog helped a lot and solved my issues with custom navigation button:
http://keighl.com/post/ios7-interactive-pop-gesture-custom-back-button/
In summary, he implements a custom UINavigationController that uses the pop gesture delegate. Very clean and portable!
Code:
#interface CBNavigationController : UINavigationController <UINavigationControllerDelegate, UIGestureRecognizerDelegate>
#end
#implementation CBNavigationController
- (void)viewDidLoad
{
__weak CBNavigationController *weakSelf = self;
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
{
self.interactivePopGestureRecognizer.delegate = weakSelf;
self.delegate = weakSelf;
}
}
// Hijack the push method to disable the gesture
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
self.interactivePopGestureRecognizer.enabled = NO;
[super pushViewController:viewController animated:animated];
}
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animate
{
// Enable the gesture again once the new controller is shown
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)])
self.interactivePopGestureRecognizer.enabled = YES;
}
Edit. Added fix for problems when a user tries to swipe left on a root view controller:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if ([self respondsToSelector:#selector(interactivePopGestureRecognizer)] &&
self.topViewController == [self.viewControllers firstObject] &&
gestureRecognizer == self.interactivePopGestureRecognizer) {
return NO;
}
return YES;
}
RootView
override func viewDidAppear(_ animated: Bool) {
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = false
}
ChildView
override func viewDidLoad() {
self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}
extension ChildViewController: UIGestureRecognizerDelegate {}
Use this logic to keep enable or disable the swipe gesture..
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animate
{
if ([self.navigationController respondsToSelector:#selector(interactivePopGestureRecognizer)])
{
if (self.navigationController.viewControllers.count > 1)
{
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
else
{
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
}
I had a similar problem where I was assigning the current view controller as the delegate for the interactive pop gesture, but would break the gesture on any views pushed, or views underneath the view in the nav stack. The way I solved this was to set the delegate in -viewDidAppear, then set it to nil in -viewWillDisappear. That allowed my other views to work correctly.
Imagine we are using Apple's default master/detail project template, where master is a table view controller and tapping on it will show the detail view controller.
We want to customize the back button that appears in the detail view controller. This is how to customize the image, image color, text, text color, and font of the back button.
To change the image, image color, text color, or font globally, place the following in a location that is called before any of your view controllers are created (e.g. application:didFinishLaunchingWithOptions: is a good place).
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UINavigationBar* navigationBarAppearance = [UINavigationBar appearance];
// change the back button, using default tint color
navigationBarAppearance.backIndicatorImage = [UIImage imageNamed:#"back"];
navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
// change the back button, using the color inside the original image
navigationBarAppearance.backIndicatorImage = [[UIImage imageNamed:#"back"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
navigationBarAppearance.backIndicatorTransitionMaskImage = [UIImage imageNamed:#"back"];
// change the tint color of everything in a navigation bar
navigationBarAppearance.tintColor = [UIColor greenColor];
// change the font in all toolbar buttons
NSDictionary *barButtonTitleTextAttributes =
#{
NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Light" size:12.0],
NSForegroundColorAttributeName: [UIColor purpleColor]
};
[[UIBarButtonItem appearance] setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];
return YES;
}
Note, you can use appearanceWhenContainedIn: to have more control over which view controllers are affected by these changes, but keep in mind that you can't pass [DetailViewController class], because it is contained inside a UINavigationController, not your DetailViewController. This means you will need to subclass UINavigationController if you want more control over what is affected.
To customize the text or the font/color of a specific back button item, you must do so in the MasterViewController (not the DetailViewController!). This seems unintuitive because the button appears on the DetailViewController. However once you understand that the way to customize it is by setting a property on a navigationItem, it begins to make more sense.
- (void)viewDidLoad { // MASTER view controller
[super viewDidLoad];
UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithTitle:#"Testing"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
NSDictionary *barButtonTitleTextAttributes =
#{
NSFontAttributeName: [UIFont fontWithName:#"HelveticaNeue-Light" size:12.0],
NSForegroundColorAttributeName: [UIColor purpleColor]
};
[buttonItem setTitleTextAttributes:barButtonTitleTextAttributes forState:UIControlStateNormal];
self.navigationItem.backBarButtonItem = buttonItem;
}
Note: attempting to set the titleTextAttributes after setting self.navigationItem.backBarButtonItem doesn't seem to work, so they must be set before you assign the value to this property.
Create a class 'TTNavigationViewController' which is subclass of 'UINavigationController' and make your existing navigation controller of this class either in storyboard/class, Example code in class -
class TTNavigationViewController: UINavigationController, UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.setNavigationBarHidden(true, animated: false)
// enable slide-back
if self.responds(to: #selector(getter: UINavigationController.interactivePopGestureRecognizer)) {
self.interactivePopGestureRecognizer?.isEnabled = true
self.interactivePopGestureRecognizer?.delegate = self
}
}
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}}