WCSession：是否可以取消排队的消息？
WCSession: is it possible to cancel queued message?
有没有办法取消WCSession的sendMessage(_:replyHandler:errorHandler:)方法发送的消息？
Messages are queued serially and delivered in the order in which you sent them.
没有。这种类型的转移是不可取消的，因为
OS 会立即将任何 sendMessage 数据发送给 reachable 对方
Use the [sendMessage] method to transfer data to a reachable counterpart. These methods are intended for immediate communication between your iOS app and WatchKit extension.
Data sent using the [sendMessage], and transferCurrentComplicationUserInfo: methods has a higher priority and is transmitted right away.
OS 没有提供专门取消消息的机制
唯一具有 cancel 方法的 WCSession 对象是 WCSessionUserInfoTransfer 和 WCSessionFileTransfer，因为优先级较低的 transferUserInfo 或 transferFile 数据不会立即发送，而是在 OS.
有没有办法取消WCSession的sendMessage(_:replyHandler:errorHandler:)方法发送的消息？
Messages are queued serially and delivered in the order in which you sent them.
没有。这种类型的转移是不可取消的，因为
OS 会立即将任何
sendMessage数据发送给reachable对方Use the [sendMessage] method to transfer data to a reachable counterpart. These methods are intended for immediate communication between your iOS app and WatchKit extension.
Data sent using the [sendMessage], and
transferCurrentComplicationUserInfo:methods has a higher priority and is transmitted right away.OS 没有提供专门取消消息的机制
唯一具有
cancel方法的WCSession对象是WCSessionUserInfoTransfer和WCSessionFileTransfer，因为优先级较低的transferUserInfo或transferFile数据不会立即发送，而是在 OS. 确定的最佳时间发送