GKAgentDelegate的协议方法不正确吗?-TheprotocolmethodofGKAgentDelegateisnotrightinSwift?

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As GKAgent2D is a subclass of GKAgent, you can simply upcast it:

由于GKAgent2D是GKAgent的一个子类，您可以简单地将其上传:

func agentDidUpdate(agent: GKAgent) {
    if let agent2d = agent as? GKAgent2D {
        // do thing with agent2d.position
    }
}

The documentation for GKAgentDelegate (from Xcode 7, beta 1; i.e. the OSX 10.11 SDK) shows the same type (GKAgent) for both languages:

GKAgentDelegate的文档(来自Xcode 7, beta 1;即osx10.11 SDK)显示了两种语言相同的类型(GKAgent):

So it should have always been GKAgent under Objective-C in order to be strictly correct, however Objective-C is less type-safe than Swift, so you could get away with it (with the possibility that you'd get an unrecognized selector exception if a GKAgent object was ever passed to the delegate method and you assumed it was a GKAgent2D).

所以它应该在objective - c一直GKAgent为了严格正确,然而objective - c是不如迅速类型安全的,所以你可以侥幸成功(可能你会得到一个未被选择器异常如果GKAgent对象被传递给委托方法,你认为这是一个GKAgent2D)。