- (nullable id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationControllerinteractionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController NS_AVAILABLE_IOS(7_0);- (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationControlleranimationControllerForOperation:(UINavigationControllerOperation)operationfromViewController:(UIViewController *)fromVCtoViewController:(UIViewController *)toVC  NS_AVAILABLE_IOS(7_0);

- (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController
{if ([animationController isKindOfClass:[PopAnimation class]])return _interactivePopTransition;return nil;
}- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC
{if (operation == UINavigationControllerOperationPop)return _popAnimation;return nil;
}- (void)handlePopGestureOperation:(UIPanGestureRecognizer *)recognizer{//将手指在屏幕上的移动距离与屏幕宽度比例作为动画的进度CGPoint translationInScreen = [recognizer translationInView:[UIApplication sharedApplication].keyWindow];CGFloat progress = translationInScreen.x / [UIScreen mainScreen].bounds.size.width;progress = MIN(1.0, MAX(0.0, progress));if (recognizer.state == UIGestureRecognizerStateBegan) {//新建手势交互对象_interactivePopTransition = [[UIPercentDrivenInteractiveTransition alloc] init];//开始执行pop动画
        [_naviController popViewControllerAnimated:YES];}else if (recognizer.state == UIGestureRecognizerStateChanged) {//更新进度
        [_interactivePopTransition updateInteractiveTransition:progress];}else if (recognizer.state == UIGestureRecognizerStateEnded|| recognizer.state == UIGestureRecognizerStateCancelled) {//手势结束时如果进度大于一半，那么就完成pop操作，否则取消if (progress > 0.5) {[_interactivePopTransition finishInteractiveTransition];}else {[_interactivePopTransition cancelInteractiveTransition];}//手势交互结束，清理对象_interactivePopTransition = nil;}
}

// This is used for percent driven interactive transitions, as well as for container controllers that have companion animations that might need to
// synchronize with the main animation.
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext;
// This method can only  be a nop if the transition is interactive and not a percentDriven interactive transition.
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext;@optional// This is a convenience and if implemented will be invoked by the system when the transition context's completeTransition: method is invoked.
- (void)animationEnded:(BOOL) transitionCompleted;

// The view in which the animated transition should take place.
- (nullable UIView *)containerView;//动画所在的容器view
- (BOOL)transitionWasCancelled;//转换是否取消// This must be called whenever a transition completes (or is cancelled.)
// Typically this is called by the object conforming to the
// UIViewControllerAnimatedTransitioning protocol that was vended by the transitioning
// delegate.  For purely interactive transitions it should be called by the
// interaction controller. This method effectively updates internal view
// controller state at the end of the transition.
- (void)completeTransition:(BOOL)didComplete;//完成转换，必须在动画完成时调用// Currently only two keys are defined by the
// system - UITransitionContextToViewControllerKey, and
// UITransitionContextFromViewControllerKey.
// Animators should not directly manipulate a view controller's views and should
// use viewForKey: to get views instead.
- (nullable __kindof UIViewController *)viewControllerForKey:(NSString *)key;//取得视图控制器// Currently only two keys are defined by the system -
// UITransitionContextFromViewKey, and UITransitionContextToViewKey
// viewForKey: may return nil which would indicate that the animator should not
// manipulate the associated view controller's view.
- (nullable __kindof UIView *)viewForKey:(NSString *)key NS_AVAILABLE_IOS(8_0);//取得视图控制器的view，兼容iOS7，可以直接用上面取到的viewController.view

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext {return _transitionDuration;
}- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {_transitionContext = transitionContext;//当前控制器UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];//动画结束显示的控制器UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];//执行交互动画的容器viewUIView *containerView = [transitionContext containerView];[containerView insertSubview:toViewController.view belowSubview:fromViewController.view];NSTimeInterval duration = [self transitionDuration:transitionContext];switch (_popAnimationType) {case PopAnimationTranslation: {CGFloat containerWidth = containerView.frame.size.width;toViewController.view.transform = CGAffineTransformMakeTranslation(-containerWidth / 4.0, 0);[UIView animateWithDuration:duration animations:^{toViewController.view.transform = CGAffineTransformMakeTranslation(0, 0);fromViewController.view.transform = CGAffineTransformMakeTranslation(containerWidth, 0);}completion:^(BOOL finished) {//动画结束，必须调用此方法[transitionContext completeTransition:!transitionContext.transitionWasCancelled];}];break;}case PopAnimationFlip: {[UIView beginAnimations:@"View Flip" context:nil];[UIView setAnimationDuration:duration];[UIView setAnimationDelegate:self];[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:containerView cache:YES];[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:)];[UIView commitAnimations];[containerView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];break;}case PopAnimationCube: {CATransition *transiton = [CATransition animation];transiton.type = @"cube";transiton.subtype = @"fromLeft";transiton.duration = duration;transiton.removedOnCompletion = NO;transiton.fillMode = kCAFillModeForwards;transiton.delegate = self;[containerView.layer addAnimation:transiton forKey:nil];[containerView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];break;}}
}- (void)animationDidStop:(CATransition *)anim finished:(BOOL)flag {[_transitionContext completeTransition:!_transitionContext.transitionWasCancelled];
}

- (void)base_pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{if (![self.interactivePopGestureRecognizer.view.gestureRecognizers containsObject:self.base_panGestureRecognizer]) {[self.interactivePopGestureRecognizer.view addGestureRecognizer:self.base_panGestureRecognizer];self.base_panGestureRecognizer.delegate = [self base_panGestureRecognizerDelegateObject];self.base_currentDelegateObject = [[NavigationControllerDelegateObject alloc] initWithUINavigationController:self];[self.base_panGestureRecognizer addTarget:self.base_currentDelegateObject action:@selector(handlePopGestureOperation:)];self.interactivePopGestureRecognizer.enabled = NO;}[self base_setupViewControllerBasedNavigationBarAppearanceIfNeeded:viewController];if (![self.viewControllers containsObject:viewController]) {[self base_pushViewController:viewController animated:animated];}
}

base项目已更新：git@github.com:ALongWay/base.git
项目增加了新的UINavigationController+PopOperation分类，但是未引用到项目中，需要的同学，可先删除PopGesture分类的引用，再添加该分类的应用。