Object-oriented 1

Key-Value code (KVC) key-value listener (KVO)

SetValue: Attribute value Forkey: Property name does not find corresponding member variable will burst exception (first method-member variable-member variable of name within Class) _ Member variable name

Valueforkey: Property name does not find the corresponding member variable will burst exception (first method-member variable-member variable of name within Class)

Method name underscore member variable member variable

Resolving exception Methods overriding Setvalue:forundefinedkey: Methods and Valueforundefinedkey: Methods

Handling nil Value Rewrite Setnilvalueforkey: Method

Processing compound type with key path Forkeypath:valueforkeypath:

Actually, it's better than performance. The KVC operation has good performance without getter and setter methods. Just KVC simple operation. It can refine the universal code.

KVO (key value observing) key-value monitoring

Registration method AddObserver:forKeyPath:option:context;

Delete method: Removerobserver:forkeypath and RemoverObserver:forKeyPath:context:

ObserValueForKeyPath:ofObject:change:context is called: you need to override the modification method to change the state when used for callbacks.

Object-oriented 1