第二讲实例变量可见度,set/get方法,自定义初始化(代码) 及description的使用

一.实例变量可见度,setter和getter方法,自定义初始化的综合使用实例

   Person.h文件

#import <Foundation/Foundation.h>

@interface Person : NSObject
{
    @private
    NSString *_name;
    int _age;
    @protected
    NSString *_sex;
    NSString *_hobby;
    @public
    NSString *_address;
    BOOL _isMarried;
}
-(void)initWithName:(NSString*)newName age:(int)newAge;

-(id)initWithName:(NSString*)newName age:(int)newAge sex:(NSString*)sex;

-(void)setName:(NSString*)name;
-(NSString*)name;

-(void)setAge:(int)age;
-(int)age;

-(void)setHobby:(NSString*)hobby;
-(NSString*)hobby;

-(void)setAddress:(NSString*)address;
-(NSString*)address;

-(void)setSex:(NSString*)sex;
-(NSString*)sex;

-(void)setIsmarried:(BOOL)ismarried;
-(BOOL)ismarried;
 
@end

    Person.m文件

#import "Person.h"

@implementation Person

-(void)initWithName:(NSString*)newName age:(int)newAge
{
    _name = newName;
    _age = newAge;
}

-(id)initWithName:(NSString*)newName age:(int)newAge sex:(NSString*)newSex
{
    _name = newName;
    _age = newAge;
    _sex = newSex;
    
    return self;
}

-(void)setName:(NSString*)name
{
    _name = name;
}
-(NSString*)name
{
    return _name;
}

-(void)setAge:(int)age
{
    _age = age;
}
-(int)age
{
    return _age;
}

-(void)setHobby:(NSString*)hobby
{
    _hobby = hobby;
}
-(NSString*)hobby
{
    return _hobby;
}

-(void)setAddress:(NSString*)address
{
    _address = address;
}
-(NSString*)address
{
    return _address;
}

-(void)setSex:(NSString*)sex
{
    _sex = sex;
}
-(NSString*)sex
{
    return _sex;
}

-(void)setIsmarried:(BOOL)ismarried
{
    _isMarried = ismarried;
}
-(BOOL)ismarried
{
    return _isMarried;
}

//description 方法的默认实现是返回值和对象的内存地址,通过重写descripton 方法能够起到快速输出的作用
-(NSString*)description
{
    return [NSString stringWithFormat:@"%@ %d %@",_name,_age,_sex];

}

@end

    main.m文件

#import <Foundation/Foundation.h>


#import "Person.h"


int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        
        Person *p1 = [[Person alloc]init];
        [p1 setName:@"刘亦菲"];
        [p1 setAge:20];
        [p1 setAddress:@"香港"];
        [p1 setIsmarried:YES];
        NSString *_name = [p1 name];
        int _age = [p1 age];
        NSString *_address = [p1 address];
        BOOL _isMarried = [p1 ismarried];
        
        NSLog(@"%@  %d %@ %hhd" ,_name,_age,_address,_isMarried);
        
        NSLog(@"%@ %d %@ %hhd",[p1 name],[p1 age],[p1 address],[p1 ismarried]);

        Person *p2 = [[Person alloc]initWithName:@"小明" age:16  sex:@"男"];
        //初始化标准输出格式
        NSLog(@"%@  %d  %@",[p2 name],[p2 age],[p2 sex]);
        
         //通过重写descripton 方法能够起到快速输出的作用
        NSLog(@"%@",p2);

    }
    return 0;
}