iOS开发-实现导航栏从无到有的平稳过渡效果

项目中我们经常会遇到这个问题,比如页面A没有导航栏,页面B有导航栏,那么如果从A push到B 或者从B返回到A时, Navc不合时宜的出现或消失会让交互变的很突兀,以下提供一种解决方法

首先,我们先写一个继承自UINavigationController的BaseNavigationController类,并将所关联到的Navc替换成BaseNavigationController,然后重写pushViewController: animated:方法,如下

-(void)pushViewController:(UIViewController*)viewController animated:(BOOL)animated{[superpushViewController:viewController animated:animated];[selfsetNavigationBarHidden:NO animated:YES];}

然后在需要隐藏导航栏的界面的viewWillAppear:方法中添加如下代码

-(void)viewWillAppear:(BOOL)animated{[superviewWillAppear:animated];[self.navigationController setNavigationBarHidden:YES animated:YES];}