ios - NSValueTransformer是什么？怎么用？

Question

NSValueTransformer is an abstract class that is used by the Cocoa Bindings technology to transform values from one representation to another.

An application creates a subclass of NSValueTransformer, overriding the necessary methods to provide the required custom transformation.

Answer 1

可以参考 NSHipster 中 NSValueTransformer 这篇文章