【深入浅出Objective-C】4.4类的继承和重写

来源：互联网发布：淘宝加盟被骗了怎么办编辑：程序博客网时间：2024/05/21 21:45

#import <Foundation/Foundation.h>//四个宏定义武器的默认值#define DEFAULT_WEAPON_NAME @""#define DEFAULT_WEAPON_PRODUCER @""#define DEFAULT_WEAPON_LONG 1.0 //1米#define DEFAULT_WEAPON_WEIGHT 10.0 //10斤//枚举类型定义武器的所有可能品质typedef enum WeaponQuality{    kPoorQuality = 1,//品质差    kNormalQuality,//品质一般    kGoodQuality,//品质好    kExcellQuality,//极品}WeaponQuality;//类的声明中有简单类型的int，有指针类型的NSString *//在Object-c中类成员量声明中，默认都是使用protected来修饰亦是，即变量对于子类是可以看到且使用的//如果你想把成员量变成public或者private，只需在需要变更类型的亦是前增加个 @public 或 @private@interface Weapon : NSObject{    //武器名字    NSString *_strName;    //武器制作人    NSString *_strProducer;    //武器制作时间    NSDate *_dateBirth;    //武器品质    WeaponQuality _quality;    //武器长度    float _fLong;    //武器重量    float _fWeight;}//打造武器-(id)initWithName:(NSString *)aWeaponName produceName:(NSString *)aProducerName producerAbility:(int)abilityValue;//攻击-(void)attack:(id)hitTarget;//武器的攻击力-(int)attackValue;@end

#import "Weapon.h"@implementation Weapon-(id)initWithName:(NSString *)aWeaponName produceName:(NSString *)aProducerName producerAbility:(int)abilityValue{    self = [super init];    if(self){        //武器名字赋值        if(aWeaponName){            _strName = [[NSString alloc]initWithString:aWeaponName];        }else{            _strName = [DEFAULT_WEAPON_NAME retain];        }        //武器制作人赋值        if(aProducerName){            _strProducer = [[NSString alloc]initWithString:aProducerName];        }else{            _strName = [DEFAULT_WEAPON_PRODUCER retain];        }                //当前时间        _dateBirth = [[NSDate date] retain];        //根据制作人的实力决定武器的品质        if(abilityValue <= 10){            _quality = kPoorQuality;        }else if (abilityValue <= 50){            _quality = kNormalQuality;        }else if (abilityValue <= 80){            _quality = kGoodQuality;        }else{            _quality = kExcellQuality;        }                //默认武器属性        _fLong = DEFAULT_WEAPON_LONG;        _fWeight = DEFAULT_WEAPON_WEIGHT;    }    return self;}-(void)dealloc{    [_strName release];    [_strProducer release];    [_dateBirth release];    [super dealloc];}-(void)attack:(id)hitTarget{    NSLog(@"attack...%@",hitTarget);    //没有攻击对象    if(!hitTarget){        NSLog(@"not target...");        return;    }    //攻击对象判定    if([(NSObject *)hitTarget respondsToSelector:@selector(receiveAttack:)]){        [hitTarget performSelector:@selector(receiveAttack:) withObject:[NSNumber numberWithInt:[self attackValue]]];    }}-(void)receiveAttack:(int)who{    NSLog(@"weapon receiveAttack...%d",who);}-(int)attackValue{    //根据品质决定攻击力    switch (_quality) {        case kNormalQuality:            return 50;            break;        case kGoodQuality:            return 70;            break;        case kExcellQuality:            return 110;        default:            return 20;            break;    }}@end

//下方两个类继承Weapon类

#import "Weapon.h"#import <AppKit/AppKit.h>//继承@interface Sword : Weapon{        //子类新增的属性    NSColor *_colorBody;//剑身颜色    NSString *_materialBody;//剑身材质        NSColor *_colorSheath;//剑鞘颜色    NSString *_materialSheath;//剑鞘材质        NSColor *_colorHandle;//剑柄颜色    NSString *_materialHandle;//剑柄材质    }-(void)initSwordAttr;@end

#import "Sword.h"@implementation Sword//重写override-(id)initWithName:(NSString *)aWeaponName produceName:(NSString *)aProducerName producerAbility:(int)abilityValue{    self = [super initWithName:aWeaponName produceName:aProducerName producerAbility:abilityValue];    if(self){        [self initSwordAttr];    }    return self;}//初始化方法-(void)initSwordAttr{    NSLog(@"Sword initSwordAttr...");    _colorBody = [[NSColor lightGrayColor]retain];    _materialBody = [[NSString alloc]initWithString:@"铁"];        _colorSheath = [[NSColor brownColor]retain];    _materialSheath = [[NSString alloc]initWithString:@"皮革"];        _colorHandle = [[NSColor blackColor]retain];    _materialHandle = [[NSString alloc]initWithString:@"木头"];        _fLong = 1.2f;    _fWeight = 20.0f;}-(int)attackValue{    switch (_quality) {        case kNormalQuality:            return 500;            break;        case kGoodQuality:            return 700;            break;        case kExcellQuality:            return 1100;            break;        default:            return 20;    }}

#import "Sword.h"//继承@interface MoXieSword : Sword-(id)initWithProducerName:(NSString *)aProducerName produceAbility:(int)abilityValue;@end

#import "MoXieSword.h"@implementation MoXieSword-(id)initWithProducerName:(NSString *)aProducerName produceAbility:(int)abilityValue{    return [self initWithName:@"莫邪" produceName:aProducerName producerAbility:abilityValue];}//重写override-(id)initWithName:(NSString *)aWeaponName produceName:(NSString *)aProducerName producerAbility:(int)abilityValue{    self = [super initWithName:aWeaponName produceName:aProducerName producerAbility:abilityValue];        if(self){        if(![_strName isEqualToString:@"莫邪"]){            _strName = [[NSString alloc]initWithString:@"莫邪"];        }        _fLong = 1.2f;        _fWeight = 20.0f;    }    return self;}//super initWithName 的时候会调用此重写的方法-(void)initSwordAttr{    NSLog(@"MoXieSword initSwordAttr...");    _colorBody = [[NSColor darkGrayColor]retain];    _materialBody = [[NSString alloc] initWithString:@"陨石"];        //没有剑鞘    _colorSheath = nil;    _materialSheath = nil;        _colorHandle = [[NSColor whiteColor]retain];    _materialHandle = [[NSString alloc]initWithString:@"千年神木"];}-(void)attack:(id)hitTarget{    if(!hitTarget){        return;    }    if([hitTarget respondsToSelector:@selector(receiveAttack:)]){        [hitTarget performSelector:@selector(receiveAttack:) withObject:[NSNumber numberWithInt:[self attackValue] * 10]];    }}-(int)attackValue{    switch (_quality) {        case kExcellQuality:            return 100000;            break;        default:            return 700;            break;    }}@end

#import <Foundation/Foundation.h>#import "Person.h"#import "Weapon.h"#import "Sword.h"#import "MoXieSword.h"int main(int argc, const char * argv[]){    @autoreleasepool {        Weapon *weapon = [[[Weapon alloc]initWithName:@"剑" produceName:@"coooliang" producerAbility:100]autorelease];                MoXieSword *moxie = [[MoXieSword alloc]initWithProducerName:@"coooliang" produceAbility:100];[moxie attack:weapon];            }    return 0;}

0 0