我在游戏中有6种不同的敌人,我想开始随机产生一个,直到我得到50分,然后添加一个新的随机。我想这样做,直到所有的敌人都在玩耍。在这一刻,所有的敌人都从一开始就在玩耍。
我有一个arc4random switch语句叫做wenn我的移动地面处于某个位置。我读到NSMutableArray可能是一个解决方案,但它只能包含对象。
这是我的代码:
// The method that is called to add an random enemy:
-(void)addRandomEnemy {
switch (arc4random() % 12) {
case 0:
[self addEnemy1];
break;
case 1:
[self addEnemy2];
break;
case 2:
[self addEnemy3];
break;
case 3:
[self addEnemy4];
break;
case 4:
[self addEnemy5];
break;
case 5:
[self addEnemy6];
break;
}
}
// Inside the update method:
if (ground.position.x < 333 && ground.position.x > 328) {
[self addRandomEnemy];
}
if (ground.position.x < 666 && ground.position.x > 661) {
[self addRandomEnemy];
}
我的问题是,如何在特定数量的点之后为产卵周期添加新的敌人?
谢谢你们! (在Objective-c中的代码请)
编辑更新代码:
-(void)addRandomEnemy:(int)number {
// Array
NSArray *numberArray = @[@0, @1, @2, @3, @4 ,@5, @6];
NSMutableArray *numbers = [[NSMutableArray alloc] initWithArray:numberArray];
// shuffle
NSUInteger count = [numbers count];
for (NSUInteger i = 0; i < count; ++i) {
int nElements = count - i;
int n = (arc4random() % nElements) + i;
[numbers exchangeObjectAtIndex:i withObjectAtIndex:n];
}
// Here I can't replace the case 0 with numbers[0]
switch (arc4random() % number) {
case 0:
[self addEnemy1];
break;
case 1:
[self addEnemy2];
break;
case 2:
[self addEnemy3];
break;
case 3:
[self addEnemy4];
break;
case 4:
[self addEnemy5];
break;
case 5:
[self addEnemy6];
break;
}
}
它现在说:“表达式不是整数常量表达式”
答案 0 :(得分:1)
//This 2 arrays you should initialize like properties, not in the update method, because otherwise result array will be always with 1 random element
NSMutableArray *numberArray = [NSMutableArray arrayWithArray:@[@0,@1,@2,@3,@4,@5]];
NSMutableArray *resultArr = [[NSMutableArray alloc] initWithCapacity:6];
NSNumber *randomType = [[NSNumber alloc] initWithDouble:(arc4random() % number)];
if ([numberArray containsObject:randomType]) {
[numberArray removeObject:randomType];
if (![resultArr containsObject:randomType]) {
[resultArr addObject:randomType];
}
}
NSNumber *enemyTypeIndex = [[NSNumber alloc] initWithDouble:arc4random() % [resultArr count]];
[self addSomeEnemy:[resultArr objectAtIndex:[enemyTypeIndex integerValue]]];
那就是你的adSomeEnemy方法(取消注释方法调用):
- (void)addSomeEnemy:(NSNumber *)enemy {
switch ([enemy integerValue]) {
case 0:
//[self addEnemy1];
break;
case 1:
// [self addEnemy2];
break;
case 2:
//[self addEnemy3];
break;
case 3:
// [self addEnemy4];
break;
case 4:
// [self addEnemy5];
break;
case 5:
// [self addEnemy6];
break;
}
}
只有你现在应该做的事情 - 将2个第一个数组作为属性,在你想要的地方(但在第一个更新调用之前)初始化它们,例如在initWithSize方法中,并替换&#34; numberArray&#34; /&# 34; resultArr&#34;与&#34; self.numberArray&#34; /&#34; self.resultArr&#34;