Spawn让多个action同时执行。
Spawn有多种不同的create方法,最终都调用了createWithTwoActions(FiniteTimeAction *action1, FiniteTimeAction *action2)方法。
createWithTwoActions调用initWithTwoActions方法:
对两个action变量初始化:
_one = action1;
_two = action2;
如果两个action时间不同,创建Sequence,包含短时间action和暂停action,用Sequence替代短时间action,达到两个action时间一致:
if (d1 > d2) { _two = Sequence::createWithTwoActions(action2, DelayTime::create(d1 - d2)); } else if (d1 < d2) { _one = Sequence::createWithTwoActions(action1, DelayTime::create(d2 - d1)); }
startWithTarget对两个action初始化:
ActionInterval::startWithTarget(target); _one->startWithTarget(target); _two->startWithTarget(target);
update中执行两个action的update。