1、定義普通殭屍類： 實例變量：殭屍種類、殭屍總血量、殭屍每次失血量。 方法：初始化方法(設置殭屍種類，總血量)、被打擊失血、死亡。

<span style="font-size:32px;">@interface OrdinaryZombie : NSObject
{
    NSString *_species;    //種類
    NSInteger _totalVolume;   //總血量
    NSInteger _everyTimeLoss;  //每次失血量
}
//初始化
- (id)initWithSpecies:(NSString *)species totalVolume:(NSInteger)totalVolume;
- (void)seteveryTimeLoss:(NSInteger)everyTimeLoss;
//讀取
- (NSString *)species;
- (NSInteger)totalVolume;
- (NSInteger)everyTimeLoss;

//被打擊失血
- (NSInteger)bloodLoss;
- (void)death;
@end
</span>

<span style="font-size:32px;">@implementation OrdinaryZombie
- (id)initWithSpecies:(NSString *)species totalVolume:(NSInteger)totalVolume
{
    _species = species;
    _totalVolume = totalVolume;
    return self;
}
- (NSString *)species
{
    return _species;
}
- (NSInteger)totalVolume
{
    return _totalVolume;
}

- (void)seteveryTimeLoss:(NSInteger)everyTimeLoss
{
    _everyTimeLoss = everyTimeLoss;
}
- (NSInteger)everyTimeLoss
{
    return _everyTimeLoss;
}

- (NSInteger)bloodLoss
{
    NSInteger i = 0;
    while (_totalVolume > 0) {
        _totalVolume -= _everyTimeLoss;
        i++;
    }
    return i;
}
- (void)death
{
    NSLog(@"殭屍死亡");
}
@end
@autoreleasepool {
        OrdinaryZombie *or = [[OrdinaryZombie alloc] initWithSpecies:@"普通殭屍" totalVolume:50];
        NSLog(@"%@,%ld",[or species],[or totalVolume]);
        NSLog(@"殭屍來襲,準備攻擊");
        [or seteveryTimeLoss:3];
        NSLog(@"被打擊掉血%ld",[or everyTimeLoss]);
        NSLog(@"被打擊%ld次之後",[or bloodLoss]);
        [or death];</span>