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af7a2f09d7
This adds support for the concept of visibility depth. Visibility essentially defines the number of user actions it would take a user to have a view controller visible. Knowing a view controllers visibility depth allows view controllers to take action such as clearing out memory that can be restored at a later date. This patch also add two new view controller subclasses which adopt the ASManagesChildVisibilityDepth protocol. Any view controller that has child view controllers can adopt this protocol to indicate to the child what they're visibility is. For example, ASNavigationController will return a visibility depth of it's own visibilityDepth + 1 for a view controller that would be revealed by tapping the back button.
122 lines
3.3 KiB
Objective-C
122 lines
3.3 KiB
Objective-C
//
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// ASNavigationController.m
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// Pods
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//
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// Created by Garrett Moon on 4/27/16.
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//
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//
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#import "ASNavigationController.h"
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@implementation ASNavigationController
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{
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BOOL _parentManagesVisibilityDepth;
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NSInteger _visibilityDepth;
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}
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- (void)didMoveToParentViewController:(UIViewController *)parent
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{
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[super didMoveToParentViewController:parent];
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[self visibilityDepthDidChange];
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}
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- (void)viewWillAppear:(BOOL)animated
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{
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[super viewWillAppear:animated];
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if (_parentManagesVisibilityDepth == NO) {
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_visibilityDepth = 0;
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[self visibilityDepthDidChange];
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}
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}
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- (void)viewDidDisappear:(BOOL)animated
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{
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[super viewDidDisappear:animated];
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if (_parentManagesVisibilityDepth == NO) {
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_visibilityDepth = 1;
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[self visibilityDepthDidChange];
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}
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}
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- (NSInteger)visibilityDepth
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{
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if (self.parentViewController && _parentManagesVisibilityDepth == NO) {
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_parentManagesVisibilityDepth = [self.parentViewController conformsToProtocol:@protocol(ASManagesChildVisibilityDepth)];
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}
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if (_parentManagesVisibilityDepth) {
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return [(id <ASManagesChildVisibilityDepth>)self.parentViewController visibilityDepthOfChildViewController:self];
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}
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return _visibilityDepth;
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}
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- (void)visibilityDepthDidChange
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{
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for (UIViewController *viewController in self.viewControllers) {
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if ([viewController conformsToProtocol:@protocol(ASVisibilityDepth)]) {
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[(id <ASVisibilityDepth>)viewController visibilityDepthDidChange];
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}
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}
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}
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- (NSInteger)visibilityDepthOfChildViewController:(UIViewController *)childViewController
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{
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NSUInteger viewControllerIndex = [self.viewControllers indexOfObject:childViewController];
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NSAssert(viewControllerIndex != NSNotFound, @"childViewController is not in the navigation stack.");
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if (viewControllerIndex == self.viewControllers.count - 1) {
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//view controller is at the top
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return [self visibilityDepth] + 0;
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} else if (viewControllerIndex == 0) {
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//view controller is the root view controller. Can be accessed by holding the back button.
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return [self visibilityDepth] + 1;
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}
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return [self visibilityDepth] + self.viewControllers.count - 1 - viewControllerIndex;
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}
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#pragma mark - UIKit overrides
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- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
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{
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NSArray *viewControllers = [super popToViewController:viewController animated:animated];
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[self visibilityDepthDidChange];
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return viewControllers;
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}
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- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated
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{
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NSArray *viewControllers = [super popToRootViewControllerAnimated:animated];
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[self visibilityDepthDidChange];
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return viewControllers;
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}
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- (void)setViewControllers:(NSArray *)viewControllers
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{
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[super setViewControllers:viewControllers];
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[self visibilityDepthDidChange];
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}
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- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated
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{
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[super setViewControllers:viewControllers animated:animated];
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[self visibilityDepthDidChange];
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}
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- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
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{
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[super pushViewController:viewController animated:animated];
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[self visibilityDepthDidChange];
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}
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- (UIViewController *)popViewControllerAnimated:(BOOL)animated
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{
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UIViewController *viewController = [super popViewControllerAnimated:animated];
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[self visibilityDepthDidChange];
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return viewController;
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}
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@end
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