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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。
+(void)load;、+(void)initialize; 有什么用处?在Objective-C中,runtime会自动调用每个类的两个方法。+load会在类初始加载时调用,+initialize会在第一次调用类的类方法或实例方法之前被调用。这两个方法是可选的,且只有在实现了它们时才会被调用。
共同点: 两个方法都只会被调用一次。
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