//

//  Person.h

#import <Foundation/Foundation.h>

@interface Person : NSObject

@property int age;

@property NSString *name;

/*

 自定义构造方法:

 其实就是自定义一个init方法

 1.一定是对象方法

 2.一定返回id/instancetype

 3.方法名称一定以init开头

*/

- (instancetype)initWithAge:(int)age;

//- (instancetype)initwithAge:(int)age;   // 注意: 自定义构造方法中的init后面的With的W一定要大写

// 一个类可以有0个或者多个自定义构造方法

- (instancetype)initWithName:(NSString *)name;

// 自定义构造方法可以有1个或多个参数

- (instancetype)initWithAge:(int)age andName:(NSString *)name;

@end

//

//  Person.m

#import "Person.h"

@implementation Person

- (instancetype)init

{

    if (self = [super init]) {

        _age = ;

    }

    return self;

}

- (NSString *)description

{

    return [NSString stringWithFormat:@"age = %i, name = %@", _age, _name];

}

- (instancetype)initWithAge:(int)age

// 注意: 自定义构造方法中的init后面的With的W一定要大写

//- (instancetype)initwithAge:(int)age

{

    if (self = [super init]) {

        _age = age;

    }

    return self;

}

- (instancetype)initWithName:(NSString *)name

{

    if (self  =[super init]) {

        _name = name;

    }

    return self;

}

- (instancetype)initWithAge:(int)age andName:(NSString *)name

{

    if (self = [super init]) {

        _age = age;

        _name = name;

    }

    return self;

}

@end

//

//  Student.h

#import "Person.h"

@interface Student : Person

@property int no; // 学号

- (instancetype)initWithAge:(int)age andName:(NSString *)name andNo:(int)no;

@end

//

//  Student.m

//  day14

#import "Student.h"

@implementation Student

- (instancetype)initWithAge:(int)age andName:(NSString *)name andNo:(int)no

{

    /*

    if (self = [super init]) {

//        _age = age;

        // 狗拿耗子, 多管闲事

        // 自己的事情自己做

        [self setAge:age];

        [self setName:name];

    }

     */

    if (self = [super initWithAge:age andName:name]) {

        _no = no;

    }

    return self;

}

- (NSString *)description

{

    return [NSString stringWithFormat:@"age = %i, name = %@, no = %i", [self age], [self name], _no];  //父类的属性是私有的。

}

@end

//

//  main.m

//  自定义构造方法在继承中的表现

#import <Foundation/Foundation.h>

#import "Student.h"

#import "Person.h"

int main(int argc, const char * argv[]) {

//    Student *stu = [[Student alloc] initWithAge:30 andName:@"lnj"];

    Student *stu = [[Student alloc] initWithAge: andName:@"lnj" andNo:];

    NSLog(@"%@", stu);

    return ;

}