Ios学习

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^ 是 Objective-C 的 block 对象,也被称为 closure 或 lambdas,代表一段可以运行的代码,并且这段代码可以引用/修改调用它的对象的属性

(void (^)(void)) animation, 没有参数 / 返回值,在以上的 animateWithDuration: 中,用来修改视图 (view) 的动画属性 (animatable properties)

(void (^)(BOOL finished))completion,当动画结束时被调用的一段代码,BOOL finished 代表被调用时动画是否已经结束

UIView 类文档 (class reference)中有这两个 block 的定义 

原文地址:https://www.cnblogs.com/chengjun/p/4898176.html