1217.2--defines a class + method declaration call

To create a new class

New file->cocoa Class (parent class NSObject)

. h files are used to define properties and methods

. m files are used to specifically implement

Method declaration:

1 #import <foundation/foundation.h>2  @interface person:nsobject{3     nsstring *name;4     int age;5     NSString *address; 6} 7-(void) usetools;  method declaration without parameter return value 8-(void) SetName: (NSString *) AName Age   : (int) aAge;  Declaration of a parameter without a return value 9 @end

1. Age is a label that describes the function of the following functions

2.-Symbol, for instance method, must instantiate an object, call with Object

The + symbol, as a class method, does not need to instantiate an object that can be called directly from the class itself

3. The member variable is written in {}, and the method is written outside {}, before end

4. All declared methods must be implemented

Invocation of the method

1 #import <Foundation/Foundation.h> 2 #import "Person.h" 3  4 int main (int argc, const char * argv[]) {5     @au Toreleasepool {6 person         *hr = [[Person alloc]init]; 7         [hr setname:@ "HR" age:22]; 8         [HR Usetools]; 9     }10
   return 0;11}

1. #import "Person.h" into the header file

2. Person *HR = [[Person alloc]init]; allocate memory and initialize space

3. [] means message, who does what

4. [HR setname:@ "Huo" age:22]; label advantages

1217.2--defines a class + method declaration call