popToRootViewControllerAnimated

如下代码是tabBarController收到一个通知后跳转到首页的一个逻辑，XLBaseNavigation 继承自UINavigationController，self集成自TabBarController。这里会出现一个问题

• (void)goHome:(NSNotification *)notfication {
  XLBaseNavigation *nav = self.childViewControllers[self.selectedIndex];
  [nav popToRootViewControllerAnimated:YES];
  self.tabBar.hidden = NO;

  self.selectbtn.selected = NO;
  self.selectbtn = [self.barView viewWithTag:100];
  self.selectbtn.selected = YES;
  self.selectedIndex = self.selectbtn.tag-100;
  }

  
  N.gif

其实道理很简单，就是popToRootViewControllerAnimated执行动画是一段时间完成的一系列pop操作，可以理解成异步的，所以必须等pop动画里的代码执行完成才能让self.tabBar显示出来,或者直接不让popToRootViewControllerAnimated不做动画，就ok

• (void)goHome:(NSNotification *)notfication {
  XLBaseNavigation *nav = self.childViewControllers[self.selectedIndex];
  [nav popToRootViewControllerAnimated:NO];
  self.tabBar.hidden = NO;
  self.selectbtn.selected = NO;

  self.selectbtn = [self.barView viewWithTag:100];
  self.selectbtn.selected = YES;
  self.selectedIndex = self.selectbtn.tag-100;
  }
  效果如下

  
  Y.gif