iOS 7的手势滑动返回
Posted wzzkaifa
tags:
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如今使用默认模板创建的ios App都支持手势返回功能,假设导航栏的返回button是自己定义的那么则会失效,也能够參考这里手动设置无效。
- if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
- self.navigationController.interactivePopGestureRecognizer.enabled = NO;
- }
假设是由于自己定义导航button而导致手势返回失效,那么能够在NavigationController的viewDidLoad函数中加入例如以下代码:
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- // Do any additional setup after loading the view.
- __weak typeof (self) weakSelf = self;
- if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
- self.interactivePopGestureRecognizer.delegate = weakSelf;
- }
- }
这样写了以后就能够通过手势滑动返回上一层了,可是假设在push过程中触发手势滑动返回。会导致导航栏崩溃(从日志中能够看出)。针对这个问题,我们须要在pop过程禁用手势滑动返回功能:
- - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
- {
- // fix ‘nested pop animation can result in corrupted navigation bar‘
- if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
- self.interactivePopGestureRecognizer.enabled = NO;
- }
- [super pushViewController:viewController animated:animated];
- }
- - (void)navigationController:(UINavigationController *)navigationController
- didShowViewController:(UIViewController *)viewController
- animated:(BOOL)animated
- {
- if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
- navigationController.interactivePopGestureRecognizer.enabled = YES;
- }
- }
除了使用系统默认的动画,还能够使用自己定义过渡动画(丰满的文档):
- - (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
- animationControllerForOperation:(UINavigationControllerOperation)operation
- fromViewController:(UIViewController *)fromVC
- toViewController:(UIViewController *)toVC
- {
- if (operation == UINavigationControllerOperationPop) {
- if (self.popAnimator == nil) {
- self.popAnimator = [WQPopAnimator new];
- }
- return self.popAnimator;
- }
- return nil;
- }
- - (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
- interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController
- {
- return self.popInteractionController;
- }
- #pragma mark -
- - (void)enablePanToPopForNavigationController:(UINavigationController *)navigationController
- {
- UIScreenEdgePanGestureRecognizer *left2rightSwipe = [[UIScreenEdgePanGestureRecognizer alloc]
- initWithTarget:self
- action:@selector(didPanToPop:)];
- //[left2rightSwipe setDelegate:self];
- [left2rightSwipe setEdges:UIRectEdgeLeft];
- [navigationController.view addGestureRecognizer:left2rightSwipe];
- self.popAnimator = [WQPopAnimator new];
- self.supportPan2Pop = YES;
- }
- - (void)didPanToPop:(UIPanGestureRecognizer *)panGesture
- {
- if (!self.supportPan2Pop) return ;
- UIView *view = self.navigationController.view;
- if (panGesture.state == UIGestureRecognizerStateBegan) {
- self.popInteractionController = [UIPercentDrivenInteractiveTransition new];
- [self.navigationController popViewControllerAnimated:YES];
- } else if (panGesture.state == UIGestureRecognizerStateChanged) {
- CGPoint translation = [panGesture translationInView:view];
- CGFloat d = fabs(translation.x / CGRectGetWidth(view.bounds));
- [self.popInteractionController updateInteractiveTransition:d];
- } else if (panGesture.state == UIGestureRecognizerStateEnded) {
- if ([panGesture velocityInView:view].x > 0) {
- [self.popInteractionController finishInteractiveTransition];
- } else {
- [self.popInteractionController cancelInteractiveTransition];
- }
- self.popInteractionController = nil;
- }
- }
例如以下这个代理方法是用来提供一个非交互式的过渡动画的:
- - (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
- animationControllerForOperation:(UINavigationControllerOperation)operation
- fromViewController:(UIViewController *)fromVC
- toViewController:(UIViewController *)toVC
- {
- if (operation == UINavigationControllerOperationPop) {
- if (self.popAnimator == nil) {
- self.popAnimator = [WQPopAnimator new];
- }
- return self.popAnimator;
- }
- return nil;
- }
而以下这个代理方法则是提供交互式动画:
- - (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
- interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController
- {
- return self.popInteractionController;
- }
这两个组合起来使用。首先。我们须要有个动画:
- @interface WQPopAnimator : NSObject <UIViewControllerAnimatedTransitioning>
- @end
- #import "WQPopAnimator.h"
- @implementation WQPopAnimator
- - (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
- {
- return 0.4;
- }
- - (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
- {
- UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
- UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
- [[transitionContext containerView] insertSubview:toViewController.view belowSubview:fromViewController.view];
- __block CGRect toRect = toViewController.view.frame;
- CGFloat originX = toRect.origin.x;
- toRect.origin.x -= toRect.size.width / 3;
- toViewController.view.frame = toRect;
- [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
- CGRect fromRect = fromViewController.view.frame;
- fromRect.origin.x += fromRect.size.width;
- fromViewController.view.frame = fromRect;
- toRect.origin.x = originX;
- toViewController.view.frame = toRect;
- } completion:^(BOOL finished) {
- [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
- }];
- }
- @end
其次。交互式动画是通过
- UIPercentDrivenInteractiveTransition
- } else if (panGesture.state == UIGestureRecognizerStateChanged) {
- CGPoint translation = [panGesture translationInView:view];
- CGFloat d = fabs(translation.x / CGRectGetWidth(view.bounds));
- [self.popInteractionController updateInteractiveTransition:d];
- } else if (panGesture.state == UIGestureRecognizerStateEnded) {
- if ([panGesture velocityInView:view].x > 0) {
- [self.popInteractionController finishInteractiveTransition];
- } else {
- [self.popInteractionController cancelInteractiveTransition];
- }
- self.popInteractionController = nil;
- }
相同地。自己定义的动画也会有上面提到的导航栏崩溃问题。也能够通过类似的方法来解决:
- - (void)navigationController:(UINavigationController *)navigationController
- didShowViewController:(UIViewController *)viewController
- animated:(BOOL)animated
- {
- if (viewController == self.navigationController.pushingViewController) {
- self.supportPan2Pop = YES;
- self.navigationController.pushingViewController = nil;
- }
补充:位于当前navgationController的第一个([0])viewController时须要设置手势代理,不响应。
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