iOS复习笔记3:类的基本定义

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// Car.h// 类的声明// 类名:Car// 属性:m_nSpeed// 行为:run#import <Foundation/Foundation.h> // NSObject@interface Car : NSObject{// 属性:成员变量(可以是基础类型，枚举，结构体和类对象指针)@publicint m_nSpeed;// 默认初始化为0}// 行为:方法(方法名，返回值，参数)- (void)stop;- (void)run:(int)speed; // 类型需要加小括号- (bool)turnWithSpeed:(int)speed andDirection:(int)direction;// 可以只有冒号- (bool)turn:(int)speed:(int)direction;// 方法名包括冒号:turnWithSpeed:andDirection://turn:@end

// Car.m// 类的实现@implementatiom Car // Car类名- (void)stop{NSLog(@"stop");}- (void)run:(int)speed{self.m_nSpeed = speed;NSLog(@"run speed = %d", self.m_nSpeed);}- (bool)turnWithSpeed:(int)speed andDirection:(int)direction //- (bool)turn:(int)speed:(int)direction{self.m_nSpeed = speed;NSLog(@"run speed = %d, direction = %d", self.m_nSpeed, direction);return YES}@end

// main.m// 类的使用#import "Car.h"int main(){Car* car = [Car new];// 创建类的实例car->m_nSpeed = 60;// 类属性访问[car stop][car run:60][car turnWithSpeed:60 andDirection:1]return 0;}

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