Question

        let randomize = SKAction.runBlock({ [unowned self] in
            self.footstepFile = "Content/footstep\(RandomInt(1, max: 4))"
            print(self.footstepFile)
        })


        sprite.runAction(SKAction.repeatActionForever(SKAction.sequence([randomize, SKAction.playSoundFileNamed(footstepFile, waitForCompletion: true)])), withKey: "footsteps")

当这个动作运行时，footstepFile会在我打印时显示其随机化，但实际上它只是一遍又一遍地播放相同的声音文件。为什么是这样？

每当精灵移动时我都会播放此动作，并在每次停止时暂停它。当它暂停和取消暂停脚步文件的变化但如果我一直在运行，它只是一遍又一遍地播放同一个。 runblock不应该连续随机化吗？

Answer 1

我认为问题在于创建footstepFile时处于活动状态的SKAction.sequence是重复使用的playSoundFileNamed。这是因为序列只创建一次，然后重复使用。

要解决此问题，请尝试使用随机文件名创建SKAction.sequence操作数组，并将其传递给var actions = [SKAction]() for _ in 1...16 { footstepFile = "Content/footstep\(RandomInt(1, max: 4))" actions.append(SKAction.playSoundFileNamed(footstepFile, waitForCompletion: true)) } sprite.runAction(SKAction.repeatActionForever(SKAction.sequence(actions)), withKey: "footsteps")：

Select a.priceEach,  a.perc_priceEach_seg, SUM(b.perc_priceEach_seg) as perc_col
from
(                                
 Select priceEach, ((priceEach* 100)/overall_tot) as perc_priceEach_seg 
 from
 (
 Select priceEach,1 as tag
 from orderdetails
 ) a   
inner join
 (
 Select sum(priceEach) as overall_tot, 1 as tag
 from orderdetails
 ) b
 on a.tag=b.tag  
) a
inner join
(                                
 Select priceEach, ((priceEach* 100)/overall_tot) as perc_priceEach_seg 
 from
 (
 Select priceEach,1 as tag
 from orderdetails
 ) a   
inner join
 (
 Select sum(priceEach) as overall_tot, 1 as tag
 from orderdetails
 ) b
 on a.tag=b.tag  
) b
on
a.priceEach <= b.priceEach
group by a.priceEach,  a.perc_priceEach_seg
having SUM(b.perc_priceEach_seg) between 19 and 20
order by perc_priceEach_seg desc

SKAction runBlock似乎没有按预期工作

1 个答案: