I want to pop a view when swipe right on screen or it's work like back button of navigation bar.
I am using:
self.navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
This single line of code for pop navigation view and it's a work for me but when i swipe form middle of screen this will not work like Instagram iPhone app.
Here i give a one screen of Instagram app in that you can see the Example of swipe right pop navigation view:
Apple's automatic implementation of the "swipe right to pop VC" only works for the left ~20 points of the screen. This way, they make sure they don't mess with your app's functionalities. Imagine you have a UIScrollView on screen, and you can't swipe right because it keeps poping VCs out. This wouldn't be nice.
Apple says here :
interactivePopGestureRecognizer
The gesture recognizer responsible for popping the top view controller off the navigation stack. (read-only)
@property(nonatomic, readonly) UIGestureRecognizer *interactivePopGestureRecognizer
The navigation controller installs this gesture recognizer on its view and uses it to pop the topmost view controller off the navigation stack. You can use this property to retrieve the gesture recognizer and tie it to the behavior of other gesture recognizers in your user interface. When tying your gesture recognizers together, make sure they recognize their gestures simultaneously to ensure that your gesture recognizers are given a chance to handle the event.
So you will have to implement your own UIGestureRecognizer, and tie its behavior to the interactivePopGestureRecognizer of your UIViewController.
Edit :
Here is a solution I built. You can implement your own transition conforming to the UIViewControllerAnimatedTransitioning delegate. This solution works, but has not been thoroughly tested.
You will get an interactive sliding transition to pop your ViewControllers. You can slide to right from anywhere in the view.
Known issue : if you start the pan and stop before half the width of the view, the transition is canceled (expected behavior). During this process, the views reset to their original frames. Their is a visual glitch during this animation.
The classes of the example are the following :
UINavigationController > ViewController > SecondViewController
CustomPopTransition.h :
#import <Foundation/Foundation.h>
@interface CustomPopTransition : NSObject <UIViewControllerAnimatedTransitioning>
@end
CustomPopTransition.m :
#import "CustomPopTransition.h"
#import "SecondViewController.h"
#import "ViewController.h"
@implementation CustomPopTransition
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
return 0.3;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
SecondViewController *fromViewController = (SecondViewController*)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
ViewController *toViewController = (ViewController*)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *containerView = [transitionContext containerView];
[containerView addSubview:toViewController.view];
[containerView bringSubviewToFront:fromViewController.view];
// Setup the initial view states
toViewController.view.frame = [transitionContext finalFrameForViewController:toViewController];
[UIView animateWithDuration:0.3 animations:^{
fromViewController.view.frame = CGRectMake(toViewController.view.frame.size.width, fromViewController.view.frame.origin.y, fromViewController.view.frame.size.width, fromViewController.view.frame.size.height);
} completion:^(BOOL finished) {
// Declare that we've finished
[transitionContext completeTransition:!transitionContext.transitionWasCancelled];
}];
}
@end
SecondViewController.h :
#import <UIKit/UIKit.h>
@interface SecondViewController : UIViewController <UINavigationControllerDelegate>
@end
SecondViewController.m :
#import "SecondViewController.h"
#import "ViewController.h"
#import "CustomPopTransition.h"
@interface SecondViewController ()
@property (nonatomic, strong) UIPercentDrivenInteractiveTransition *interactivePopTransition;
@end
@implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationController.delegate = self;
UIPanGestureRecognizer *popRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePopRecognizer:)];
[self.view addGestureRecognizer:popRecognizer];
}
-(void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
// Stop being the navigation controller's delegate
if (self.navigationController.delegate == self) {
self.navigationController.delegate = nil;
}
}
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC {
// Check if we're transitioning from this view controller to a DSLSecondViewController
if (fromVC == self && [toVC isKindOfClass:[ViewController class]]) {
return [[CustomPopTransition alloc] init];
}
else {
return nil;
}
}
- (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController {
// Check if this is for our custom transition
if ([animationController isKindOfClass:[CustomPopTransition class]]) {
return self.interactivePopTransition;
}
else {
return nil;
}
}
- (void)handlePopRecognizer:(UIPanGestureRecognizer*)recognizer {
// Calculate how far the user has dragged across the view
CGFloat progress = [recognizer translationInView:self.view].x / (self.view.bounds.size.width * 1.0);
progress = MIN(1.0, MAX(0.0, progress));
if (recognizer.state == UIGestureRecognizerStateBegan) {
NSLog(@"began");
// Create a interactive transition and pop the view controller
self.interactivePopTransition = [[UIPercentDrivenInteractiveTransition alloc] init];
[self.navigationController popViewControllerAnimated:YES];
}
else if (recognizer.state == UIGestureRecognizerStateChanged) {
NSLog(@"changed");
// Update the interactive transition's progress
[self.interactivePopTransition updateInteractiveTransition:progress];
}
else if (recognizer.state == UIGestureRecognizerStateEnded || recognizer.state == UIGestureRecognizerStateCancelled) {
NSLog(@"ended/cancelled");
// Finish or cancel the interactive transition
if (progress > 0.5) {
[self.interactivePopTransition finishInteractiveTransition];
}
else {
[self.interactivePopTransition cancelInteractiveTransition];
}
self.interactivePopTransition = nil;
}
}
@end
Create a pan gesture recogniser and move the interactive pop gesture recogniser's targets across.
Add your recogniser to the pushed view controller's viewDidLoad and voila!
let popGestureRecognizer = self.navigationController!.interactivePopGestureRecognizer!
if let targets = popGestureRecognizer.value(forKey: "targets") as? NSMutableArray {
let gestureRecognizer = UIPanGestureRecognizer()
gestureRecognizer.setValue(targets, forKey: "targets")
self.view.addGestureRecognizer(gestureRecognizer)
}
Here's a Swift version of Spynet's answer, with a few modifications. Firstly, I've defined a linear curve for the UIView animation. Secondly, I've added a semi-transparent black background to the view underneath for a better effect. Thirdly, I've subclassed a UINavigationController. This allows the transition to be applied to any "Pop" transition within the UINavigationController. Here's the code:
CustomPopTransition.swift
import UIKit
class CustomPopTransition: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
else {
return
}
let containerView = transitionContext.containerView
containerView.insertSubview(toViewController.view, belowSubview: fromViewController.view)
// Setup the initial view states
toViewController.view.frame = CGRect(x: -100, y: toViewController.view.frame.origin.y, width: fromViewController.view.frame.size.width, height: fromViewController.view.frame.size.height)
let dimmingView = UIView(frame: CGRect(x: 0,y: 0, width: toViewController.view.frame.width, height: toViewController.view.frame.height))
dimmingView.backgroundColor = UIColor.black
dimmingView.alpha = 0.5
toViewController.view.addSubview(dimmingView)
UIView.animate(withDuration: transitionDuration(using: transitionContext),
delay: 0,
options: UIView.AnimationOptions.curveLinear,
animations: {
dimmingView.alpha = 0
toViewController.view.frame = transitionContext.finalFrame(for: toViewController)
fromViewController.view.frame = CGRect(x: toViewController.view.frame.size.width, y: fromViewController.view.frame.origin.y, width: fromViewController.view.frame.size.width, height: fromViewController.view.frame.size.height)
},
completion: { finished in
dimmingView.removeFromSuperview()
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
}
)
}
}
PoppingNavigationController.swift
import UIKit
class PoppingNavigationController : UINavigationController, UINavigationControllerDelegate {
var interactivePopTransition: UIPercentDrivenInteractiveTransition!
override func viewDidLoad() {
self.delegate = self
}
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
addPanGesture(viewController: viewController)
}
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if (operation == .pop) {
return CustomPopTransition()
}
else {
return nil
}
}
func navigationController(navigationController: UINavigationController, interactionControllerForAnimationController animationController: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
if animationController.isKind(of: CustomPopTransition.self) {
return interactivePopTransition
}
else {
return nil
}
}
func addPanGesture(viewController: UIViewController) {
let popRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePanRecognizer(recognizer:)))
viewController.view.addGestureRecognizer(popRecognizer)
}
@objc
func handlePanRecognizer(recognizer: UIPanGestureRecognizer) {
// Calculate how far the user has dragged across the view
var progress = recognizer.translation(in: self.view).x / self.view.bounds.size.width
progress = min(1, max(0, progress))
if (recognizer.state == .began) {
// Create a interactive transition and pop the view controller
self.interactivePopTransition = UIPercentDrivenInteractiveTransition()
self.popViewController(animated: true)
}
else if (recognizer.state == .changed) {
// Update the interactive transition's progress
interactivePopTransition.update(progress)
}
else if (recognizer.state == .ended || recognizer.state == .cancelled) {
// Finish or cancel the interactive transition
if (progress > 0.5) {
interactivePopTransition.finish()
}
else {
interactivePopTransition.cancel()
}
interactivePopTransition = nil
}
}
}
Example of the result:
Subclassing the UINavigationController you can add a UISwipeGestureRecognizer to trigger the pop action:
.h file:
#import <UIKit/UIKit.h>
@interface CNavigationController : UINavigationController
@end
.m file:
#import "CNavigationController.h"
@interface CNavigationController ()<UIGestureRecognizerDelegate, UINavigationControllerDelegate>
@property (nonatomic, retain) UISwipeGestureRecognizer *swipeGesture;
@end
@implementation CNavigationController
#pragma mark - View cycles
- (void)viewDidLoad {
[super viewDidLoad];
__weak CNavigationController *weakSelf = self;
self.delegate = weakSelf;
self.swipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(gestureFired:)];
[self.view addGestureRecognizer:self.swipeGesture]; }
#pragma mark - gesture method
-(void)gestureFired:(UISwipeGestureRecognizer *)gesture {
if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
{
[self popViewControllerAnimated:YES];
} }
#pragma mark - UINavigation Controller delegate
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
self.swipeGesture.enabled = NO;
[super pushViewController:viewController animated:animated]; }
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animate {
self.swipeGesture.enabled = YES; }
@end
There really is no need to roll your own solution for this, sub-classing UINavigationController and referencing the built-in gesture works just fine as explained here.
The same solution in Swift:
public final class MyNavigationController: UINavigationController {
public override func viewDidLoad() {
super.viewDidLoad()
self.view.addGestureRecognizer(self.fullScreenPanGestureRecognizer)
}
private lazy var fullScreenPanGestureRecognizer: UIPanGestureRecognizer = {
let gestureRecognizer = UIPanGestureRecognizer()
if let cachedInteractionController = self.value(forKey: "_cachedInteractionController") as? NSObject {
let string = "handleNavigationTransition:"
let selector = Selector(string)
if cachedInteractionController.responds(to: selector) {
gestureRecognizer.addTarget(cachedInteractionController, action: selector)
}
}
return gestureRecognizer
}()
}
If you do this, also implement the following UINavigationControllerDelegate function to avoid strange behaviour at the root view controller:
public func navigationController(_: UINavigationController,
didShow _: UIViewController, animated _: Bool) {
self.fullScreenPanGestureRecognizer.isEnabled = self.viewControllers.count > 1
}
