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- #import "UINavigationController+Consistent.h"
- #import <objc/runtime.h>
- /// This char is used to add storage for the isPushingViewController property.
- static char const * const ObjectTagKey = "ObjectTag";
- @interface UINavigationController ()
- @property (readwrite,getter = isViewTransitionInProgress) BOOL viewTransitionInProgress;
- @end
- @implementation UINavigationController (Consistent)
- - (void)setViewTransitionInProgress:(BOOL)property {
- NSNumber *number = [NSNumber numberWithBool:property];
- objc_setAssociatedObject(self, ObjectTagKey, number , OBJC_ASSOCIATION_RETAIN);
- }
- - (BOOL)isViewTransitionInProgress {
- NSNumber *number = objc_getAssociatedObject(self, ObjectTagKey);
- return [number boolValue];
- }
- #pragma mark - Intercept Pop, Push, PopToRootVC
- /// @name Intercept Pop, Push, PopToRootVC
- - (NSArray *)safePopToRootViewControllerAnimated:(BOOL)animated {
- if (self.viewTransitionInProgress) return nil;
- if (animated) {
- self.viewTransitionInProgress = YES;
- }
- //-- This is not a recursion, due to method swizzling the call below calls the original method.
- return [self safePopToRootViewControllerAnimated:animated];
- }
- - (NSArray *)safePopToViewController:(UIViewController *)viewController animated:(BOOL)animated {
- if (self.viewTransitionInProgress) return nil;
- if (animated) {
- self.viewTransitionInProgress = YES;
- }
- //-- This is not a recursion, due to method swizzling the call below calls the original method.
- return [self safePopToViewController:viewController animated:animated];
- }
- - (UIViewController *)safePopViewControllerAnimated:(BOOL)animated {
- if (self.viewTransitionInProgress) return nil;
- if (animated) {
- self.viewTransitionInProgress = YES;
- }
- //-- This is not a recursion, due to method swizzling the call below calls the original method.
- return [self safePopViewControllerAnimated:animated];
- }
- - (void)safePushViewController:(UIViewController *)viewController animated:(BOOL)animated {
- self.delegate = self;
- //-- If we are already pushing a view controller, we dont push another one.
- if (self.isViewTransitionInProgress == NO) {
- //-- This is not a recursion, due to method swizzling the call below calls the original method.
- [self safePushViewController:viewController animated:animated];
- if (animated) {
- self.viewTransitionInProgress = YES;
- }
- }
- }
- // This is confirmed to be App Store safe.
- // If you feel uncomfortable to use Private API, you could also use the delegate method navigationController:didShowViewController:animated:.
- - (void)safeDidShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
- //-- This is not a recursion. Due to method swizzling this is calling the original method.
- [self safeDidShowViewController:viewController animated:animated];
- self.viewTransitionInProgress = NO;
- }
- // If the user doesnt complete the swipe-to-go-back gesture, we need to intercept it and set the flag to NO again.
- - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
- id<UIViewControllerTransitionCoordinator> tc = navigationController.topViewController.transitionCoordinator;
- [tc notifyWhenInteractionEndsUsingBlock:^(id<UIViewControllerTransitionCoordinatorContext> context) {
- self.viewTransitionInProgress = NO;
- //--Reenable swipe back gesture.
- self.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)viewController;
- [self.interactivePopGestureRecognizer setEnabled:YES];
- }];
- //-- Method swizzling wont work in the case of a delegate so:
- //-- forward this method to the original delegate if there is one different than ourselves.
- if (navigationController.delegate != self) {
- [navigationController.delegate navigationController:navigationController
- willShowViewController:viewController
- animated:animated];
- }
- }
- + (void)load {
- //-- Exchange the original implementation with our custom one.
- method_exchangeImplementations(class_getInstanceMethod(self, @selector(pushViewController:animated:)), class_getInstanceMethod(self, @selector(safePushViewController:animated:)));
- method_exchangeImplementations(class_getInstanceMethod(self, @selector(didShowViewController:animated:)), class_getInstanceMethod(self, @selector(safeDidShowViewController:animated:)));
- method_exchangeImplementations(class_getInstanceMethod(self, @selector(popViewControllerAnimated:)), class_getInstanceMethod(self, @selector(safePopViewControllerAnimated:)));
- method_exchangeImplementations(class_getInstanceMethod(self, @selector(popToRootViewControllerAnimated:)), class_getInstanceMethod(self, @selector(safePopToRootViewControllerAnimated:)));
- method_exchangeImplementations(class_getInstanceMethod(self, @selector(popToViewController:animated:)), class_getInstanceMethod(self, @selector(safePopToViewController:animated:)));
- }
- @end
- NSArray *viewControllers = self.navigationController.viewControllers;
- NSArray *viewControllers = self.navigationController.viewControllers;
- for (UIViewController *viewController in viewControllers) {
- if (viewController.isBeingPresented || viewController.isBeingDismissed) {
- // In this case when a pop or push is already in progress, don't perform
- // a pop or push on the current view controller. Perhaps check again after
- // a delay.
- return;
- }
- }
- // Else if you make it through the loop uninterrupted, perform push or pop.
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