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objective-c 协议和委托 (重点基础知识） - 咕噜灵波
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<h1 class="entry-title">objective-c 协议和委托 (重点基础知识）</h1>
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<p>objective-c protocol delegate</p>
<p><strong>protocol-协议，就是使用了这个协议后就要按照这个协议来办事，协议要求实现的方法就一定要实现。 <br/>
delegate-委托，顾名思义就是委托别人办事，就是当一件事情发生后，自己不处理，让别人来处理。</strong></p>
<p>当一个A view 里面包含了B view<br/>
b view需要修改a view界面，那么这个时候就需要用到委托了。<br/>
需要几个步骤<br/>
1。首先定一个协议<br/>
2。a view实现协议中的方法<br/>
3。b view设置一个委托变量<br/>
4。把b view的委托变量设置成a view，意思就是 ，b view委托a view办事情。<br/>
5。事件发生后，用委托变量调用a view中的协议方法</p>
<p><u>delegate(委托)是iPhone开发中一个非常重要的知识点，感觉类似c语言的callback（回调函数）或是java中的Interface（接口）。</u></p>
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