nil与预期的参数类型'() - > Void'不兼容

Question

SKAction.group([moveToAction, SKAction.fadeAlphaTo(1.0, duration: 0.2)]), completion:nil)

}

runAction(SKAction.waitForDuration(0.2), completion: completion)

当我这样做时,我收到错误:

nil与预期的参数类型'() - > Void'不兼容

Answer 1

() -> Void不是Optional这样也不可能nil.

您应该将空闭包作为completion参数传递:

..., completion: {})