#TouchNavigation

类似于网易新闻客户端里面可以滑动返回的导航控制器

兼容iOS 5.1及以后，iOS5.1之前没有测试

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使用方法类型于UIKIT中的UINavigationController

init:

TouchNavigationController *nav = [[TouchNavigationController alloc] initWithRootViewController:vc];

push:

[self.touchNavigationController pushViewController:testViewController animated:YES];

pop:

[self.touchNavigationController popViewControllerAnimated:YES];

以及： - (void)popToViewController:(TouchViewController *)viewController animated:(BOOL)animated; - (void)popToRootViewControllerAnimated:(BOOL)animated;

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####注意：所有PUSH进来的ViewController都要继承于TouchViewController

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