iOS中设置backBarButtonItem的title和action

一、 设置title

在需要显示该返回键的前一个Controller中设置：

   1:   navigationItem.backBarButtonItem = UIBarButtonItem(title: "注销", style: UIBarButtonItemStyle.Plain, target: nil, action: nil)

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{
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font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
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.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
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{
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.csharpcode .lnum { color: #606060; }

二、添加返回时执行Action：

你可以尝试一下在上一行代码中的target和action处填入事件监听的处理方法，但是不会起作用的。

backBarButtonItem的描述

Discussion

When this navigation item is immediately below the top item in the stack, the navigation controller derives the back button for the navigation bar from this navigation item. When this property is nil, the navigation item uses the value in its title property to create an appropriate back button. If you want to specify a custom image or title for the back button, you can assign a custom bar button item (with your custom title or image) to this property instead. When configuring your bar button item, do not assign a custom view to it; the navigation item ignores custom views in the back bar button anyway.

说明了backBarButtonItem只能自定义image和title，不能重写target or action，系统会忽略其他的相关设置项。

如果硬是需要重写action做一些其他的工作，则需要自定义一个leftBarButtonItem，因为系统定义leftBarButtonItem的显示优先级比backBarButtonItem优先级高，当存在leftBarButtonItem时，自动忽略backBarButtonItem,达到重写backBarButtonItem的目的。

 

 

注意点

一般我们取导航控制器上的Item这样取：

navigationItem.backbarItem

如果这样表示套了两层的导航栏的最外面那层的Item，一般情况下没有这样的嵌套。

navigationController.navigationItem.backBarButtonItem

 

 

Ref:

http://blog.csdn.net/dreamno23/article/details/21085783

http://www.cnblogs.com/ihojin/p/change-backbarbuttonitem-text.html