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李二狗 — @Meniny
Published 12:10 Oct 14, 2015.
Created by @ezra. Categorized in #Programming, and tagged as #iOS.
Source format: Markdown
最近遇到和看到的一些面试题。
drawRect方法依赖Core Graphics框架来进行自定义的绘制,但这种方法主要的缺点就是它处理touch事件的方式: 每次按钮被点击后,都会用setNeddsDisplay进行强制重绘;而且不止一次,每次单点事件触发两次执行。这样的话从性能的角度来说,对CPU和内存来说都是欠佳的。特别是如果在我们的界面上有多个这样的UIButton实例。
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