iOS根视图切换动画

UIStoryboard *story = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

UINavigationController *vc = [story instantiateInitialViewController];

CATransition *animation = [CATransition animation];

[animation setDuration:0.3];//设置动画时间

animation.type = kCATransitionReveal;//设置动画类型

animation.subtype = kCATransitionFromRight;

[[UIApplication sharedApplication].keyWindow.layer addAnimation:animation forKey:nil];

self.view.window.rootViewController = vc;