7.ios-分类 继承 extention

#import <Foundation/Foundation.h>

@interface Person : NSObject
-(void)eat;
@end

//2.第二种方法
//分类的声明
//创建分类@interface <#class name#> (<#category name#>)
@interface Person (MyCategory)
-(void)run;
@end

#import "Person.h"

@implementation Person
-(void)eat{
NSLog(@"%@:eat",[self class]);
}

@end

//分类的实现
@implementation Person (MyCategory)

-(void)run{
NSLog(@"%@:run",[self class]);
}

@end

#import "Person.h"

@interface Teacher : Person
-(void)study;
@end

#import "Teacher.h"

@implementation Teacher
-(void)study{
NSLog(@"%@ :study",[self class]);
}
//重写父类方法
-(void)eat{
[super eat];//保存父类方法
NSLog(@"teacher not eat");
}

@end

#import "Person.h"
//1.第一种方法
//系统文件创建分类
//创建分类@interface Person (Category分类名可省略)
@interface Person (Category)
-(void)play;
@end

#import "Person+Category.h"

@implementation Person (Category)
-(void)play{
NSLog(@"%@ play",[self class]);
}
@end

#import "Person.h"
//与分类的区别
//@interface <#class name#> (<#category name#>)

//@end
@interface Person ()

@end

#import <Foundation/Foundation.h>
#import "Person.h"
#import "Teacher.h"
#import "Person+Category.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {

Person*person=[[Person alloc]init];
[person eat];
[person play];
[person run];

Teacher*teacher=[[Teacher alloc]init];
[teacher eat];
[teacher study];
[teacher play];
[teacher run];
}
return 0;
}