tabbar动画切换

效果1：

　　　　　UIViewController *vc = self.viewControllers[self.selectedIndex];

CATransition *animation =[CATransition animation];

[animation setDuration:0.75f];

[animation setTimingFunction:[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionDefault]];

[animation setType:kCATransitionMoveIn];

[animation setSubtype:kCATransitionFromRight];

[vc.view.layer addAnimation:animation forKey:@"reveal"];

效果2：

　　　　　CATransition *animation =[CATransitionanimation];

　　　　  [animation setDuration:0.75f];

[animation setTimingFunction:[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionDefault]];

[animation setType:kCATransitionMoveIn];

[animation setSubtype:kCATransitionFromRight];

[self.view.layer addAnimation:animation forKey:@"reveal"];

运行看效果！