我正在尝试使用singleton来管理wcsession消息，这是我发现的。
我明白它在做什么，但我不明白为什么我会出错…这是我正在努力解决的问题：
if let session = session where session.paired && session.watchAppInstalled {
错误：“watchAppInstalled”不可用
错误：“paired”不可用
问题：我如何才能使这些属性可用？一般来说，是WatchOS和iOS的新手。谢谢！
整个代码：
import WatchConnectivity
class WatchSessionManager: NSObject, WCSessionDelegate {
static let sharedManager = WatchSessionManager()
private override init() {
super.init()
}
private let session: WCSession? = WCSession.isSupported() ? WCSession.defaultSession() : nil
private var validSession: WCSession? {
// paired - the user has to have their device paired to the watch
// watchAppInstalled - the user must have your watch app installed
// Note: if the device is paired, but your watch app is not installed
// consider prompting the user to install it for a better experience
if let session = session where session.paired && session.watchAppInstalled {
return session
}
return nil
}
func startSession() {
session?.delegate = self
session?.activateSession()
}
}
// MARK: Application Context
// use when your app needs only the latest information
// if the data was not sent, it will be replaced
extension WatchSessionManager {
// Sender
func updateApplicationContext(applicationContext: [String : AnyObject]) throws {
if let session = validSession {
do {
try session.updateApplicationContext(applicationContext)
} catch let error {
throw error
}
}
}
// Receiver
func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]) {
// handle receiving application context
dispatch_async(dispatch_get_main_queue()) {
// make sure to put on the main queue to update UI!
}
}
}
// MARK: User Info
// use when your app needs all the data
// FIFO queue
extension WatchSessionManager {
// Sender
func transferUserInfo(userInfo: [String : AnyObject]) -> WCSessionUserInfoTransfer? {
return validSession?.transferUserInfo(userInfo)
}
func session(session: WCSession, didFinishUserInfoTransfer userInfoTransfer: WCSessionUserInfoTransfer, error: NSError?) {
// implement this on the sender if you need to confirm that
// the user info did in fact transfer
}
// Receiver
func session(session: WCSession, didReceiveUserInfo userInfo: [String : AnyObject]) {
// handle receiving user info
dispatch_async(dispatch_get_main_queue()) {
// make sure to put on the main queue to update UI!
}
}
}
// MARK: Transfer File
extension WatchSessionManager {
// Sender
func transferFile(file: NSURL, metadata: [String : AnyObject]) -> WCSessionFileTransfer? {
return validSession?.transferFile(file, metadata: metadata)
}
func session(session: WCSession, didFinishFileTransfer fileTransfer: WCSessionFileTransfer, error: NSError?) {
// handle filed transfer completion
}
// Receiver
func session(session: WCSession, didReceiveFile file: WCSessionFile) {
// handle receiving file
dispatch_async(dispatch_get_main_queue()) {
// make sure to put on the main queue to update UI!
}
}
}
// MARK: Interactive Messaging
extension WatchSessionManager {
// Live messaging! App has to be reachable
private var validReachableSession: WCSession? {
if let session = validSession where session.reachable {
return session
}
return nil
}
// Sender
func sendMessage(message: [String : AnyObject],
replyHandler: (([String : AnyObject]) -> Void)? = nil,
errorHandler: ((NSError) -> Void)? = nil)
{
validReachableSession?.sendMessage(message, replyHandler: replyHandler, errorHandler: errorHandler)
}
func sendMessageData(data: NSData,
replyHandler: ((NSData) -> Void)? = nil,
errorHandler: ((NSError) -> Void)? = nil)
{
validReachableSession?.sendMessageData(data, replyHandler: replyHandler, errorHandler: errorHandler)
}
// Receiver
func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
// handle receiving message
dispatch_async(dispatch_get_main_queue()) {
// make sure to put on the main queue to update UI!
}
}
func session(session: WCSession, didReceiveMessageData messageData: NSData, replyHandler: (NSData) -> Void) {
// handle receiving message data
dispatch_async(dispatch_get_main_queue()) {
// make sure to put on the main queue to update UI!
}
}
}
最佳答案
您遇到的问题是，在使用iOS SDK和WatchOS SDK编译时使用的是同一个单例。某些WCSession属性只能在其中一个或另一个上使用，因此您的代码必须考虑到这一点。具体来说，如果您查看objective-c头中的WCSession
/** Check if iOS device is paired to a watch */
@property (nonatomic, readonly, getter=isPaired) BOOL paired __WATCHOS_UNAVAILABLE;
/** Check if the user has the Watch app installed */
@property (nonatomic, readonly, getter=isWatchAppInstalled) BOOL watchAppInstalled __WATCHOS_UNAVAILABLE;
这意味着如果您想继续使用singleton，则必须更改此部分：
if let session = session where session.paired && session.watchAppInstalled {
return session
}
return nil
变得更像（有其他方法可以解决这个问题，但这是一个解决方案）：
#if os(iOS)
if let session = session where session.paired && session.watchAppInstalled {
return session
}
return nil
#else
return session
#endif
这是有条件地编译不同的代码，不管它是为iOS还是watchos编译的。你可能需要在单件游戏的其他部分应用同样的技巧，但这至少能让你开始！
关于swift - watchOS WCSession'配对'和'watchAppAvailable'不可用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36186438/