您的位置：首页 > 产品设计 > UI/UE

UINavigationController返回手势失效问题

2015-07-14 17:48 267 查看

转载：http://blog.csdn.net/cuibo1123/article/details/46841607

从iOS7开始，系统为UINavigationController提供了一个interactivePopGestureRecognizer用于右滑返回(pop),但是，如果自定了back button或者隐藏了navigationBar，该手势就失效了。

这是为什么呢？

原因

我们知道，interactivePopGestureRecognizer从手势触发到行为发生，要经过下面的阶段：

interactivePopGestureRecognizer还存在，但没有起作用，可能是delegate里被阻断了没调用target/action，或者是调用了target/action没运行动画。
经过尝试（参考别人博客），发现自定义返回按钮或者隐藏navigationBar导致的该手势未起作用是因为在delegate阶段被阻断了。
如果我们知道action的名字，则可以添加一个自定义的滑动手势，直接调用该系统action。但API文档并没有提供。
结果就是要么自己实现滑动返回的动画action，要么自己重写interactivePopGestureRecognizer的delegate以让手势继续下去，触发系统的动画action。

实现方法

那就把delegate自己实现一下吧。
新建一个类

BaseNavigationController

,实现delegate：

<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">1</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">2</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">3</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">4</span>

- (void)viewDidLoad {
[super viewDidLoad];
self.interactivePopGestureRecognizer.delegate =  self;
}

让手势生效

<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">1</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">2</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">3</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">4</span><span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">5</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">6</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">7</span>

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
if (self.viewControllers.count <= 1 ) {
return NO;
}

return YES;
}

在需要滑动返回的地方的

UINavigationController

换成

BaseNavigationController

。
完成！

然后考虑到在push动画发生的时候，禁止滑动手势，在

BaseNavigationController

添加

<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">1</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">2</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">3</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">4</span>

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
[super pushViewController:viewController animated:animated];
self.interactivePopGestureRecognizer.enabled = NO;
}

在使用navigationController的viewcontroller里添加

<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">1</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">2</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">3</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">4</span>

- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}

结果

当然不需要把上面的代码都抄一遍，因为这么通用的功能由一位韩国开发者做成组件，放在了github https://github.com/devxoul/SwipeBack。你只需要

<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">1</span>
<span class="line-number" style="font-family:inherit;color:#586e75;margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; line-height: inherit; vertical-align: baseline;">2</span>

platform :ios, '7.0'
pod 'SwipeBack', '~> 1.0'

该工程用了category+JRSwizzle交换了上面涉及到的UINavigationController的那些方法，还额外考虑了只自定义back button而不隐藏navigationBar的情况。无需一行代码，让系统的右滑返回动画重新回来！

原文地址：http://chisj.github.io/blog/2015/05/27/uinavigationcontrollerfan-hui-shou-shi-shi-xiao-wen-ti/

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航