OCdemo-07 CateGory 类目

//
//  main.m
//  OCdemo-07-01-CateGory
//
//  Created by lanou3g on 15/10/15.
//  Copyright (c) 2015年 Object. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "NSString+SayHi.h"
#import "NSDate+NowDate.h"
#import "Person.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSString *string = @"强强";
        //调用类目添加的方法
        [string sayHi];
        
        NSString *nowDate = [NSDate nowDate];
        NSLog(@"nowDate = %@",nowDate);
        
        Person *person = [[Person alloc]init];
        [person eat];
        [person call];
        
    }
    return 0;
}

person.h

//
//  Person.h
//  OCdemo-07-01-CateGory
//
//  Created by lanou3g on 15/10/15.
//  Copyright (c) 2015年 Object. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Person : NSObject
{
    NSString *_name;
    
}
-(void)eat;

-(void)call;


@end

person.m

//
//  Person.m
//  OCdemo-07-01-CateGory
//
//  Created by lanou3g on 15/10/15.
//  Copyright (c) 2015年 Object. All rights reserved.
//

#import "Person.h"

// 延展，声明私有的方法和实例变量
@interface Person ()
{
    //声明私有的实例变量
    NSString *_phoneNumber;
}

// 声明私有方法
-(void)privateMoney;

@end


@implementation Person

-(void)eat{
    NSLog(@"大黄爱吃翔");
}

-(void)call{
    _phoneNumber = @"110";
    NSLog(@"打电话%@",_phoneNumber);
}


-(void)privateMoney{
    NSLog(@"私房钱");
}


@end

NSDate+NowDate.h

#import <Foundation/Foundation.h>

@interface NSDate (NowDate)

//获取当前时间
+(NSString *)nowDate;


@end

NSDate+NowDate.m

#import "NSDate+NowDate.h"

@implementation NSDate (NowDate)

//获取当前时间
+(NSString *)nowDate{
    
    NSDate *date = [NSDate date];
    //设置时间格式
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy年MM月dd日 HH时mm分ss秒"];
    return [dateFormatter stringFromDate:date];
    
}
@end

NSString+SayHi.h

#import <Foundation/Foundation.h>

//类目： 通过类目 Category 给一个类添加方法，添加的方法，会成为原类的一部分，从而达到扩展一个类的功能
@interface NSString (SayHi)

//添加方法
-(void)sayHi;

@end

NSString+SayHi.m

#import "NSString+SayHi.h"

@implementation NSString (SayHi)

-(void)sayHi{

    NSLog(@"我是通过Category添加的方法");
}

@end