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ASNavigationController.m
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//
// ASNavigationController.m
// AsyncDisplayKit
//
// Created by Garrett Moon on 4/27/16.
//
// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#import "ASNavigationController.h"
@implementation ASNavigationController
{
BOOL _parentManagesVisibilityDepth;
NSInteger _visibilityDepth;
}
ASVisibilityDidMoveToParentViewController;
ASVisibilityViewWillAppear;
ASVisibilityViewDidDisappearImplementation;
ASVisibilitySetVisibilityDepth;
ASVisibilityDepthImplementation;
- (void)visibilityDepthDidChange
{
for (UIViewController *viewController in self.viewControllers) {
if ([viewController conformsToProtocol:@protocol(ASVisibilityDepth)]) {
[(id <ASVisibilityDepth>)viewController visibilityDepthDidChange];
}
}
}
- (NSInteger)visibilityDepthOfChildViewController:(UIViewController *)childViewController
{
NSUInteger viewControllerIndex = [self.viewControllers indexOfObjectIdenticalTo:childViewController];
if (viewControllerIndex == NSNotFound) {
//If childViewController is not actually a child, return NSNotFound which is also a really large number.
return NSNotFound;
}
if (viewControllerIndex == self.viewControllers.count - 1) {
//view controller is at the top, just return our own visibility depth.
return [self visibilityDepth];
} else if (viewControllerIndex == 0) {
//view controller is the root view controller. Can be accessed by holding the back button.
return [self visibilityDepth] + 1;
}
return [self visibilityDepth] + self.viewControllers.count - 1 - viewControllerIndex;
}
#pragma mark - UIKit overrides
- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
{
NSArray *viewControllers = [super popToViewController:viewController animated:animated];
[self visibilityDepthDidChange];
return viewControllers;
}
- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated
{
NSArray *viewControllers = [super popToRootViewControllerAnimated:animated];
[self visibilityDepthDidChange];
return viewControllers;
}
- (void)setViewControllers:(NSArray *)viewControllers
{
[super setViewControllers:viewControllers];
[self visibilityDepthDidChange];
}
- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated
{
[super setViewControllers:viewControllers animated:animated];
[self visibilityDepthDidChange];
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
[super pushViewController:viewController animated:animated];
[self visibilityDepthDidChange];
}
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
UIViewController *viewController = [super popViewControllerAnimated:animated];
[self visibilityDepthDidChange];
return viewController;
}
@end