Swift

Question

我正在尝试 this tutorial 并且遇到了一些代码问题：

class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {

我收到一个错误：

Type 'MPCManager' does not comform to protocol 'MCSessionDelegate'

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

Type 'MPCManager' does not comform to protocol 'MCNearbyServiceAdvertiserDelegate'

但是我下载了示例文件却没有出现同样的错误。我错过了哪一部分？

Answer 1

如果您想遵守这些协议，您需要实现 MCSessionDelegate 和 MCNearbyServiceBrowserDelegate 和 MCNearbyServiceAdvertiserDelegate 的所有必需委托方法。

Answer 2

您必须添加该协议所有必需的委托方法。

我已经在下面的代码中添加了所有需要的方法：

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 + 单击该委托，你将找到与该委托相关的所有方法假设如果你命令 + 单击 MCSessionDelegate 然后你会看到这样的东西：

// 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，因此如果您不添加它，您的委托可以正常工作，但您必须将以上 5 种方法添加到您的 class 中以符合协议。

希望对您有所帮助。

Answer 3

您需要执行代表的协议。你可以在 xcode.

中键入函数时找到它

Swift - MultipeerConnectivity 类型不符合协议

Swift - MultipeerConnectivity Type does not conform to protocol

protocols

ios

multipeer-connectivity