课堂笔记03

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课堂笔记03

这一节将自定义初始化方法
//
// main.m
// OC_03
//
// Created by Ibokan on 15/7/24.
// Copyright (c) 2015年 Law. All rights reserved.
//

 #import <Foundation/Foundation.h> #import "Student.h"

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

    Student *st1 = [[Student alloc] init];    NSLog(@"st的地址为%p",st1);    //st1.sID = 2013;    st1.name = @"大头";    st1.age = 23;    Student *st2 = [[Student alloc] initWithID:@"2013306" SexChoice:@"女"];    st2.name = @"小头";    st2.age = 25;}return 0;

}

//
// Student.h
// OC_03
//
// Created by Ibokan on 15/7/24.
// Copyright (c) 2015年 Law. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Student : NSObject
{
// @public
// NSString *_hero;
// NSString *_name;
// NSString *_name2;

NSString *_sexChoice;

}
//-(void)move;
@property (readonly,nonatomic,retain)NSString *sID;
@property (nonatomic,retain)NSString *name;
@property (nonatomic,assign)NSInteger age;

//自定义初始化方法
/*
initWith//固定写法
*/
-(id)initWithID:(NSString )sID SexChoice:(NSString )sexChoice;
@end

//
// Student.m
// OC_03
//
// Created by Ibokan on 15/7/24.
// Copyright (c) 2015年 Law. All rights reserved.
//

#import "Student.h"

@implementation Student

/*
self：表示指向当前实例对象的指针；
super：表示指向父类对象的指针；
super init:调用父类的init指针；
*/

-(id)init{
self = [super init];
NSLog(@”self的地址为%p”,self);
if (self) {
_sID = @”2013306”;
_sexChoice = @”女”;
}
return self;
}//若没写，系统默认写了，若写了，系统调用该方法

-(id)initWithID:(NSString )sID SexChoice:(NSString )sexChoice{
if (self = [super init]) {
_sID = sID;
_sexChoice = sexChoice;
}
return self;
}

-(void)setAge:(NSInteger)age{
if (age < 0) {
_age = 18;
}
else {
_age = age;
}
}
@end

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