iOS的自动布局：动态调整控制

问题描述

我在练自动布局，我已经达成了一些问题，我的布局是像

I am practicing autolayout, I have struck on some issue, My layout is like

== Username TextField ==
== Password Textfield ==
==Login Button ==

但是，当用户输入错误的用户名或密码，应改为

But when user enters wrong username or password it should be changed to

== Username TextField ==
== Password Textfield ==
== Verification Textfield ==
==Login Button ==

我知道如何通过设置帧来实现它，但我想通过自动布局和约束去做
所以，我需要你的帮助做到这一点。这将是巨大的，如果我可以用故事板做它无需编写code单线

I know how to achieve it by setting frames but I want to do it by autolayout and constrainsSo I need your help to do it. And it would be great if I can do it using storyboard without writing single line of code

在此先感谢

推荐答案

的愿望布局很简单，可能得到与自动布局的帮助下完成的，但你的问题没有具体说明任何问题，但总的来说，所以我会建议采取看看这里一个伟大的教程有关自动布局并试图理解基本概念，如果您有任何具体麻烦那么欢迎你

The desire layout is simple and possible to get done with the help of autolayout but you question is not specific about any problem but in general so i would suggest take a look here a great tutorials about autolayout http://www.raywenderlich.com/50317/beginning-auto-layout-tutorial-in-ios-7-part-1 and try to understand the basic concept, and if you have any specific trouble then you are welcome

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