UIView 可以复制吗? [英] Can UIView be copied?

问题描述

简单地使用这种方式:

UIView* view2 = [view1 copy]; // view1 existed

这将导致模拟器无法启动此应用程序.

This will cause simulator can not launch this app.

尝试保留，

UIView* view2 = [view1 retain]; // view1 existed
// modify view2 frame etc

对view2 的任何修改都将适用于view1，我知道view2 与view1 共享相同的内存.

Any modifications to view2 will apply to view1, I understand that view2 share same memory with view1.

为什么不能复制UIView?是什么原因?

Why can't UIView be copied? What is the reason?

推荐答案

您的应用可能会因以下原因崩溃:

Your app probably crashes with something like:

 [UIView copyWithZone:]: unrecognized selector sent to instance 0x1c6280

原因是UIView没有实现复制协议，所以UIView中没有copyWithZone选择器.

The reason is that UIView does not implement the copying protocol, and therefore there is no copyWithZone selector in UIView.

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