用户定义的运行时属性可访问性

Question

我在IB中为我的自定义UIView创建了一个用户定义的运行时属性，有趣的是，我可以在touchesBegan：withEvent：方法中访问它，但不能在initWithCoder中访问它：你知道为什么吗？

Answer 1

如果您需要在设置视图时访问值而不是在initWithCode:中处理它initWithCode:使用awakeFromNib

Answer 2

It is because the views from IB are finished loading after initWithCoder . The following will help you understand the process. It is explained for UIViewControllers , but the concept is the same (from the ViewController Programming Guide ):

When you create a view controller in a storyboard, the attributes you configure in Interface Builder are serialized into an archive. Later, when the view controller is instantiated, this archive is loaded into memory and processed. The result is a set of objects whose attributes match those you set in Interface Builder. The archive is loaded by calling the view controller's initWithCoder: method.