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<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="UTF-8">
<title>Ios-dev-record by will0321</title>
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<body>
<section class="page-header">
<h1 class="project-name">Ios-dev-record</h1>
<h2 class="project-tagline">iOS开发过程中的一些纪录</h2>
<a href="https://github.com/will0321/IOS-Dev-Record" class="btn">View on GitHub</a>
<a href="https://github.com/will0321/IOS-Dev-Record/zipball/master" class="btn">Download .zip</a>
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<section class="main-content">
<p>一.关于fram和bound</p>
<ul>
<li>1）fame是相对父view的坐标系统；bound是自己的坐标系统；</li>
<li>2）bound默认x,y的是（0，0）；</li>
<li>3）改变bound影响它子view的显示，它本身的显示位置相对它自己的父view显示位置不变</li>
<li>4）改变view bound的x,y后，子view的变化用一句话表示：本身先移动(x,y),子不变。将新的显示效果放在view的fram表示的位置。</li>
</ul>
<p>二.关于kvo,NSNotification,delegate三种观察者模式</p>
<ul>
<li>1）kvo用于model改变view需要对应改变的场景；</li>
<li>2）NSNotification用于一个地方改变，很多地方需要变化的场景，有点类似广播的场景；NSNotification不要滥用，会影响代码的可读性。</li>
<li>3）观察者模式，最先考虑delegate。虽然写法稍微麻烦，但是代码可读性高。</li>
</ul>
<footer class="site-footer">
<span class="site-footer-owner"><a href="https://github.com/will0321/IOS-Dev-Record">Ios-dev-record</a> is maintained by <a href="https://github.com/will0321">will0321</a>.</span>
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