头文件
1 @interface Student : NSObject{ 2 int age; 3 int height; 4 }//成员变量的声明区间,成员变量必须在此声明 5 6 - (int)age;//本来是getAge,但是OC的习惯是用变量来命名get方法 7 - (void)setAge:(int)newAge; 8 //多形参的函数写法比较特别 9 - (void)setAge:(int)newAge andHeight:(int)newHeight; 10 @end//类的结束标记,必须写
对应的m文件为:
1 #import "Student.h" 2 @implementation Student 3 4 - (int)age{ 5 return age; 6 } 7 - (void)setAge:(int)newAge{ 8 age = newAge; 9 } 10 - (void)setAge:(int)newAge andHeight:(int)newHeight{ 11 age = newAge; 12 height = newHeight; 13 } 14 @end
对象的创建和方法调用:
//OC创建对象分2步,先调用静态无参函数alloc申请内存,在调用静态无参函数init初始化 //1. Student *stu = [Student alloc];//仅仅为对象分陪内存空间 //2. stu = [stu init];//真正创建对象 //以上2步一般简写为: Student *stu = [[Student alloc] init]; //设置 [stu setAge:100]; [stu setAge:100 andHeight:50]; //获取 NSLog(@"age is %i",[stu age]); [stu release];//对象使用完毕要释放内存
对象的构造方法
1 @interface Student{ 2 int _age;//标准写法 3 int _no; 4 } 5 - (void)setAge:(int)age; 6 - (int)age; 7 - (void)setNo:(int)no; 8 - (int)no; 9 //构造方法 10 - (id)initWithAge:(int)age andNo:(int)no; 11 @end
对应的m文件:
1 #include "Student.h" 2 @implementation Student 3 4 - (int)age{ 5 return _age; 6 } 7 - (void)setAge:(int)age{ 8 _age = age; 9 } 10 //... 11 //实现构造方法 12 - (id)initWithAge:(int)age andNo:(int)no{ 13 //以下写法不严谨 14 //self = [super init]; 15 //_age = age; 16 //_no = no; 17 if(self=[super init]){ 18 _age = age; 19 _no = no; 20 } 21 return self; 22 } 23 @end
时间: 2024-10-07 14:19:26