在iPhone App的导航栏上实现后退按钮

Question

Just recently took over a project from my developer. I'm a noob to coding, but can figure things out pretty well. I'm just trying to implement Back button on one of my screens. It already has the navigation Bar, but no back button, just the title.

Is there a guide on how to get this implemented? Any help would be great!

Thanks!

Update = Here is the code:

<object class="IBUINavigationController" id="144954994">
<reference key="NSNextResponder" ref="191373211"/>
<int key="NSvFlags">290</int>
<string key="NSFrameSize">{320, 44}</string>
<reference key="NSSuperview" ref="191373211"/>
<bool key="IBUIOpaque">NO</bool>
<bool key="IBUIClearsContextBeforeDrawing">NO</bool>
<int key="IBUIBarStyle">2</int>
<object class="NSArray" key="IBUIItems">
<bool key="EncodedWithXMLCoder">YES</bool>
<object class="IBUINavigationController" id="445217273">
<reference key="IBUINavigationController" ref="144954994"/>
<string key="IBUITitle">Answer Question</string>
</object>
</object>
</object>

Answer 1

如果您使用UINavigationController来控制视图堆栈，则在您推入新视图时会自动为您添加“后退”按钮。

Answer 2

Are you using UINavigationController's? If so, it's automatically put there when you push a view.

(Update based on comment) Using a UINavigationBar

http://developer.apple.com/iphone/library/documentation/uikit/reference/UINavigationBar_Class/Reference/UINavigationBar.html

 bar.topItem.leftBarButtonItem = // set to a UIButton