objective-c - 创建的对象数

Question

我已经创建了创建对象的函数，但我不知道如何确保每个对象都执行该函数

-(id) init{
   if (self = [super init]){
       _die = [[NSMutableArray alloc] init];
   }
   return self;
}

-(void) addDice:(Die *)d{
    [_die addObject:d];
}

-(void) roll{
    for (int i=0; i<_die; i++) //this is the part i don't get how to do'
    {
        Die *d = _die[i];
        [d roll];
    };
}

Answer 1

NSMutableArray实例具有获取-count当前数组中对象数量的方法。您可能想要这样做：

-(void)roll{
    for (int i=0; i<_die.count; i++) //Enumerate the array
    {
        Die *d = [_die objectAtIndex:i]; // Get the i th object in _die.
        [d roll];
    }
}