ios学习笔记2

类的构建

Student.h

#include <Foundation/Foundation.h>
@interface Student:NSObject{
    int age;
}
-(int) age;
-(void) setAge:(int) newAge;
+(id) title;//+为类方法，相当于java中的static,另外字符串返回值使用id,不是NSString
@end //这个必须要，不然会在导入的文件里，提示missing end错误

Student.m

#import "Student.h"
@implementation Student

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

+(id) title{    return @"student";}
@end

使用

Student *student=[[Student alloc] init];
[student setAge:100];
NSLog(@"student age is %i",[student age]);//100NSLog(@"student age is %@",[Student title]);//student

[student release];//对象使用完毕要释放内存