NSKeyValueCoding protocol is used in every sample code I've shown until now. I also have been calling it a protocol, but as I said earlier, it's an informal protocol, a
KVC is a mechanism that enables you to indirectly access an object's properties, using a "key" of strings to do it. To enable KVC,
NSKeyValueCoding must be complied by your classes. Most of the time, you don't need to do anything in order to get it done because it's complied by
To make a key-value coding compliant class for a certain property, the methods
valueForKey: must be implemented to work as expected.
You must ensure that your class has the ...