Self-study Ios:second day objective-c

OC is a superset of C, extended from C, with object-oriented features such as classes, messages, and single inheritance.

Part of C:

Data type:

Short,int,long,float,double,char,pointer,struct

Common methods:

ReadLine ()

Atoi ()

sizeof ()

malloc ()

Part of OC:

Receiver:classnameorobject

Selector:method

Message delivery is achieved through [receiver selector],

Eg:nsdate *now = [NSDate Date];

-:instance method, Entity methods, depends on an instance of a class;

+:class method, class methods, Java-like static methods.

Instance variable start with an Understore:such as _name.

Multi-parameter method invocation:

[Receiver Selector:argoneval Argtwoname:argtwoval argthreename:argthreeval ... ］

ID: Eg:id delegate when unsure what type of object it is pointing to;

Note the ID type of the variable is preceded by an * number.

This article is from the "Phoenixisland" blog, make sure to keep this source http://phoenix2012.blog.51cto.com/1799358/1430957