页面跳转添加动画
SecondViewController *secondVC=[[SecondViewController alloc]init];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.9];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];
[self.navigationController pushViewController:secondVC animated:NO];
[UIView commitAnimations];