【学习笔记之ios开发】1.Object-C语法概述

Dog.m
//
//  Dog.m
//  OCBasic1
//
//  Created by peter on 14-1-26.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import "Dog.h"

@implementation Dog

- (id) init
{
return [self initWithID:1];
//    self = [super init];
//    //super表示父类
//    //self表示对象自己
//    if (self) {
//        ID = 1;
//        age = 2;
//        price = 60.0f;
//    }
//    return self;
}

- (id) initWithID:(int)newID
{
return [self initWithID:newID andAge:2 andPrice:60.0f];
//    self = [super init];
//    if(self){
//        ID = newID;
//        age = 2;
//        price = 60.0f;
//    }
//    return self;
}
- (id) initWithID:(int)newID andAge:(int)newAge
{
return [self initWithID:newID andAge:newAge andPrice:60.0f];
}

- (id) initWithID:(int)newID andAge:(int)newAge andPrice:(float)newPrice
{
self = [super init];
if(self){
ID = newID;
age = newAge;
price = newPrice;
}
return self;
}
- (void) setID:(int)newID
{
ID = newID;
}

- (int) getID
{
return ID;
}

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

- (void) setPrice:(float)newPrice
{
price = newPrice;
}
- (float) getPrice
{
return price;
}

- (void) setID:(int)newID andAge:(int)newAge
{
ID = newID;
age = newAge;
}

- (void) setID:(int)newID andAge:(int)newAge andPrice:(float)newPrice
{
ID = newID;
age = newAge;
price = newPrice;
}

@end

//  OCBasic1
//  Dog.m
//  Created by peter on 14-1-26.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Dog : NSObject

{   //写字段
@protected
int ID;
@public
int age;
@private
float price;
}
//凡是以initXXXX开头的都是构造函数
- (id) init;
//函数名为init   不带参数
- (id) initWithID:(int)newID;
//函数名为initWithID:带一个int的参数
- (id) initWithID:(int)newID andAge:(int)newAge;
//函数名为initWithID:andAge:带两个参数，都为int
- (id) initWithID:(int)newID andAge:(int)newAge andPrice:(float)newPrice;
//函数名为initWithID:andAge:andPrice:带3个参数

- (void) setID:(int)newID;
- (int) getID;
//set/get ID
- (void) setAge:(int)newAge;
- (int) getAge;

- (void) setPrice:(float)newPrice;
- (float) getPrice;

- (void) setID:(int)newID andAge:(int)newAge;
//setID:andAge: 两个参数
- (void) setID:(int)newID andAge:(int)newAge andPrice:(float)newPrice;
//setID:andAge:andPrice  三个参数

@end

//
//  main.m
//  OCBasic1
//
//  Created by peter on 14-1-26.
//  Copyright (c) 2014年 peter. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Dog.h"
int main(int argc, const char * argv[])
{

@autoreleasepool {

// insert code here...
NSLog(@"Hello, World!");
//write code here.
Dog *dog1 = [Dog alloc];
[dog1 init];

int ID = [dog1 getID];
int age = [dog1 getAge];
float price = [dog1 getPrice];

printf("dog1 id is %d age is %d price is %f\n",ID,age,price);
//dog1 id is 1 age is 2 price is 60.000000

//        Dog *dog2 = [Dog alloc];
//        [dog2 initWithID:100 andAge:26 andPrice:68.88];
Dog *dog2 = [[Dog alloc] initWithID:100 andAge:36 andPrice:68.88];
ID = [dog2 getID];
age = [dog2 getAge];
price = [dog2 getPrice];
printf("dog2 id is %d age is %d price is %f\n",ID,age,price);
//dog2 id is 100 age is 36 price is 68.879997

[dog2 setID:2014 andAge:38 andPrice:87.2];
ID = [dog2 getID];
age = [dog2 getAge];
price = [dog2 getPrice];
printf("dog2 new id is %d age is %d price is %f\n",ID,age,price);
//dog2 new id is 2014 age is 38 price is 87.199997
}
return 0;
}