Swift - MultipeerConnectivity类型不符合协议

Question

我正在尝试这个教程并且代码有些问题：

class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {

我收到一个错误：

类型'MPCManager'不符合协议'MCSessionDelegate'

类型'MPCManager'不符合协议'MCNearbyServiceBrowserDelegate'

类型'MPCManager'不符合协议'MCNearbyServiceAdvertiserDelegate'

但是我下载了它没有得到相同错误的示例文件。 我错过了哪一部分？

Answer 1

如果要符合这些协议，则需要实现MCSessionDelegate和MCNearbyServiceBrowserDelegate以及MCNearbyServiceAdvertiserDelegate所需的所有委托方法。

Answer 2

您必须添加该协议的所有必需委托方法。

我在下面的代码中添加了所有必需的方法：

import Foundation
import MultipeerConnectivity


class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {

    //Type 'MPCManager' does not comform to protocol 'MCSessionDelegate'
    // Remote peer changed state
    func session(session: MCSession!, peer peerID: MCPeerID!, didChangeState state: MCSessionState){

    }

    // Received data from remote peer
    func session(session: MCSession!, didReceiveData data: NSData!, fromPeer peerID: MCPeerID!){

    }

    // Received a byte stream from remote peer
    func session(session: MCSession!, didReceiveStream stream: NSInputStream!, withName streamName: String!, fromPeer peerID: MCPeerID!){

    }

    // Start receiving a resource from remote peer
    func session(session: MCSession!, didStartReceivingResourceWithName resourceName: String!, fromPeer peerID: MCPeerID!, withProgress progress: NSProgress!){

    }

    // Finished receiving a resource from remote peer and saved the content in a temporary location - the app is responsible for moving the file to a permanent location within its sandbox
    func session(session: MCSession!, didFinishReceivingResourceWithName resourceName: String!, fromPeer peerID: MCPeerID!, atURL localURL: NSURL!, withError error: NSError!){

    }


    //Type 'MPCManager' does not comform to protocol 'MCNearbyServiceBrowserDelegate'

    // Found a nearby advertising peer
    func browser(browser: MCNearbyServiceBrowser!, foundPeer peerID: MCPeerID!, withDiscoveryInfo info: [NSObject : AnyObject]!){

    }

    // A nearby peer has stopped advertising
    func browser(browser: MCNearbyServiceBrowser!, lostPeer peerID: MCPeerID!){

    }

    //Type 'MPCManager' does not comform to protocol 'MCNearbyServiceAdvertiserDelegate'
    // Incoming invitation request.  Call the invitationHandler block with YES and a valid session to connect the inviting peer to the session.
    func advertiser(advertiser: MCNearbyServiceAdvertiser!, didReceiveInvitationFromPeer peerID: MCPeerID!, withContext context: NSData!, invitationHandler: ((Bool, MCSession!) -> Void)!){

    }

}

如果你想检查特定委托所需的方法是什么，那么只需命令+点击该委托就可以找到与该委托相关的所有方法，如果你命令+点击MCSessionDelegate那么你会看到如下内容：

// Delegate methods for MCSession
protocol MCSessionDelegate : NSObjectProtocol {

    // Remote peer changed state
    func session(session: MCSession!, peer peerID: MCPeerID!, didChangeState state: MCSessionState)

    // Received data from remote peer
    func session(session: MCSession!, didReceiveData data: NSData!, fromPeer peerID: MCPeerID!)

    // Received a byte stream from remote peer
    func session(session: MCSession!, didReceiveStream stream: NSInputStream!, withName streamName: String!, fromPeer peerID: MCPeerID!)

    // Start receiving a resource from remote peer
    func session(session: MCSession!, didStartReceivingResourceWithName resourceName: String!, fromPeer peerID: MCPeerID!, withProgress progress: NSProgress!)

    // Finished receiving a resource from remote peer and saved the content in a temporary location - the app is responsible for moving the file to a permanent location within its sandbox
    func session(session: MCSession!, didFinishReceivingResourceWithName resourceName: String!, fromPeer peerID: MCPeerID!, atURL localURL: NSURL!, withError error: NSError!)

    // Made first contact with peer and have identity information about the remote peer (certificate may be nil)
    optional func session(session: MCSession!, didReceiveCertificate certificate: [AnyObject]!, fromPeer peerID: MCPeerID!, certificateHandler: ((Bool) -> Void)!)
}

只有最后一个方法是可选的，所以如果你不添加它你的委托工作正常，但你必须将所有上述5个方法添加到你的类中以符合协议。

希望它会有所帮助。

Answer 3

您需要实现委托的协议。 在xcode中键入函数时可以找到它。