ios - SKAction waitForDuration() 阻塞 SKAction 序列

Question

self.runAction(SKAction.sequence([ SKAction.waitForDuration(1), SKAction.runBlock({ self.speed = 0; print("pause") }), SKAction.waitForDuration(0.1), SKAction.runBlock({ self.speed = realSpeed; print("resume") }) ]))

最后一个 skaction 没有被调用。

但是当我删除第二个 waitForDuration 时，最后一个 skaction 被调用。

self.runAction(SKAction.sequence([ SKAction.waitForDuration(1), SKAction.runBlock({ self.speed = 0; print("pause") }), SKAction.runBlock({ self.speed = realSpeed; print("resume") }) ]))

这里发生了什么？

Answer 1

节点的speed 属性会影响在该节点上运行的操作的执行速度。从文档中，

The default value is 1.0, which means that all actions run at their normal speed. If you set a different speed, time appears to run faster or slower for all actions executed on the node and its descendants. For example, if you set a speed value of 2.0, actions run twice as fast.

在您的第一个 runBlock 中，您将 self 的 speed 属性设置为 0。这会导致第二个 waitForDuration Action 无限慢地运行(假设 actualDuration = duration/speed)。