我正在尝试 this tutorial由于新的 swift 版本出现了一些错误,其中之一是 MPCManager 不符合协议(protocol) MCNearbyServiceAdvertiserDelegate。
我试图修复它,所以我将 func advertiser 的 header 更改为这个:
func advertiser(advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: NSData?, invitationHandler: (Bool, MCSession)->Void) {
然后它抛出一个错误
Cannot assign value '(Bool, MCSession) -> Void' to type '(Bool, MCSession!) -> Void!'
我不知道如何解决,感谢帮助!
实际文件:
import UIKit
import MultipeerConnectivity
protocol MPCManagerDelegate {
func foundPeer()
func lostPeer()
func invitationWasReceived(fromPeer: String)
func connectedWithPeer(peerID: MCPeerID)
}
class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {
var session: MCSession!
var peer: MCPeerID!
var browser: MCNearbyServiceBrowser!
var advertiser: MCNearbyServiceAdvertiser!
var foundPeers = [MCPeerID]()
var invitationHandler: (Bool, MCSession!)->Void!
var delegate: MPCManagerDelegate?
override init() {
super.init()
invitationHandler(false, nil)
peer = MCPeerID(displayName: UIDevice.currentDevice().name)
session = MCSession(peer: peer)
session.delegate = self
browser = MCNearbyServiceBrowser(peer: peer, serviceType: "appcoda-mpc")
browser.delegate = self
advertiser = MCNearbyServiceAdvertiser(peer: peer, discoveryInfo: nil, serviceType: "appcoda-mpc")
advertiser.delegate = self
}
func browser(browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) {
foundPeers.append(peerID)
delegate?.foundPeer()
}
func browser(browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
for (index, aPeer) in EnumerateSequence(foundPeers){
if aPeer == peerID {
foundPeers.removeAtIndex(index)
break
}
}
delegate?.lostPeer()
}
func browser(browser: MCNearbyServiceBrowser, didNotStartBrowsingForPeers error: NSError) {
print(error.localizedDescription)
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ THE Error occurs here: ~~~~~~~~~~~~~~~~~~~~~~
func advertiser(advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: NSData?, invitationHandler: (Bool, MCSession)->Void) {
self.invitationHandler = invitationHandler
delegate?.invitationWasReceived(peerID.displayName)
}
func advertiser(advertiser: MCNearbyServiceAdvertiser, didNotStartAdvertisingPeer error: NSError) {
print(error.localizedDescription)
}
func session(session: MCSession, peer peerID: MCPeerID, didChangeState state: MCSessionState) {
switch state{
case MCSessionState.Connected:
print("Connected to session: \(session)")
delegate?.connectedWithPeer(peerID)
case MCSessionState.Connecting:
print("Connecting to session: \(session)")
default:
print("Did not connect to session: \(session)")
}
}
func sendData(dictionaryWithData dictionary: Dictionary<String, String>, toPeer targetPeer: MCPeerID) -> Bool {
let dataToSend = NSKeyedArchiver.archivedDataWithRootObject(dictionary)
let peersArray = NSArray(object: targetPeer) as! [MCPeerID]
do {
_ = try session.sendData(dataToSend, toPeers: peersArray, withMode: MCSessionSendDataMode.Reliable)
} catch let error as NSError {
print(error.localizedDescription)
return false
}
return true
}
func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) {
let dictionary: [String: AnyObject] = ["data": data, "fromPeer": peerID]
NSNotificationCenter.defaultCenter().postNotificationName("receivedMPCDataNotification", object: dictionary)
}
func session(session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, withProgress progress: NSProgress) { }
func session(session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, atURL localURL: NSURL, withError error: NSError?) { }
func session(session: MCSession, didReceiveStream stream: NSInputStream, withName streamName: String, fromPeer peerID: MCPeerID) { }
}
最佳答案
您使用 (Bool, MCSession!)->Void!
类型定义了 invitationHandler
变量,然后为其赋值 (Bool, MCSession)->Void)
类型。这就是导致您的错误消息的原因。
要解决此问题,请使用带有 invitationHandler
变量的参数匹配类型定义您的 advertiser
方法。
关于Swift:无法将值 '(Bool, MCSession) -> Void' 分配给类型 '(Bool, MCSession!) -> Void!',我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33509118/