[Objective-c] Simple implementation of an OC class

I. Grammatical specifications

1. Class: Abstract description of a thing, such as the abstraction of humans, dogs and cats into animal classes

Two files in OC to describe a class

1>. H: declaration file for a class declaring member variables and methods, the declaration code of a class between keywords @interface and @end ;

2>. M: the implementation file for the class that implements the method in the. h file, the declaration code of the class between the keyword @implementation and the @end ;

Note: The methods in the. h file only participate in declarations and do not participate in implementations; that is, only method types, method return value types, method names, method parameter types, and method internal code are not written

2. Method:

Classification of 1> methods

• +: Represents a class method (static method)

• -: Represents an object method (dynamic method)

Example:

Object methods
-(ID) initwithdict: (Nsdictionary *) dic;//class method + (ID) initwithdict: (Nsdictionary *) dic;

2> the scope of all methods in the. h file is the public type

3. Member variables

There are 3 common scope of member variables:

1> @public can be accessed globally
2> @protected can only be accessed within the class and in subclasses
3> @private can only be accessed within the class

[Objective-c] Simple implementation of an OC class