在iOS 8中,Tabbar的viewcontroller在更改方向时会重新加载

请注意,启用viewWillTransitionToSize后,您需要手动调用方向更改方法.

每个方向更改方法调用,调用此方法和tabbar类中的方法.

解决方案是使用手动调用,如下所示：

-(void) viewWillTransitionToSize:(CGSizE)sizewithTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
 //[super viewWillTransitionToSize:sizewithTransitionCoordinator:coordinator];
   UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
   UIInterfaceOrientation toInterfaceOrientation = orientation;    
   if ([self.SELEctedViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController *navCtrl = (UINavigationController*)self.SELEctedViewController;
        UIViewController* NavSubController = [[navCtrl viewControllers] lastObject];
        [NavSubController willRotateToInterfaceOrientation:toInterfaceOrientation duration:0.0];
   }
}