csdn_coder_zxq的博客

Key-value coding（键值编码）参考Key-value coding is a mechanism for indirectly accessing an object’s attributes and relationships using string identifiers.Key-value 编程是一种机制：允许 developer 通过字符串 ID 的方式间接访问对象...

setNilValueForKey:Invoked by setValue:forKey: when it’s given a nil value for a scalar value (such as an int or float).当使用 setValue:forKey: 把一个 nil 值赋值给纯量（如 float, int, …）时，setNilValueForKey: 会被调用...

Make a property KVC Compliant（如何确保属性值支持KVC）How you make a property KVC compliant depends on whether that property is an attribute, a to-one relationship, or a to-many relationship. For attributes an...