push跳转实现模态跳转的效果

在登录注册时候基本百分百会遇到模态出来登录界面，然后push注册或者找回密码页面，模态再push是很恶心的事情，来回切换，还需要再创建一个导航控制器，那么，有什么方法可以简单一点呢，有，那就是利用动画以假乱真，下面直接上代码。

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只需要点击时候调用即可，可以自己封装一下。

    //模态push
    RegisterViewController *regist = [[RegisterViewController alloc] init];
    CATransition *transition = [CATransition animation];
    transition.duration = 0.3f;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.type = kCATransitionMoveIn;
    transition.subtype = kCATransitionFromTop;
    transition.delegate = self;
    [self.navigationController.view.layer addAnimation:transition forKey:nil];
    [self.navigationController pushViewController:regist animated:NO];
    //**pop回
            CATransition *transition = [CATransition animation];
            transition.duration = 0.3f;
            transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
            transition.type = kCATransitionReveal;
            transition.subtype = kCATransitionFromBottom;
            transition.delegate = weekSelf;
            [weekSelf.navigationController.view.layer addAnimation:transition forKey:nil];
            [weekSelf.navigationController popViewControllerAnimated:NO];