我正在尝试this tutorial，但代码有问题：
class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {
我遇到了一个错误：
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”
但是我下载了示例文件却没有出现同样的错误。我错过了哪一部分？
【问题讨论】：
标签： ios swift protocols multipeer-connectivity
如果你想符合这些协议，你需要实现MCSessionDelegate和MCNearbyServiceBrowserDelegate和MCNearbyServiceAdvertiserDelegate的所有必需的委托方法。
【讨论】：
您必须添加该协议的所有必需委托方法。
我已将所有必需的方法添加到以下代码中：
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)!){
}
}
如果您想检查特定委托所需的方法，那么只需命令+单击该委托，您将找到与该委托相关的所有方法假设如果您命令+单击MCSessionDelegate，那么您将看到一些东西像这样：
// 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 种方法添加到您的类中以符合协议。
希望它会有所帮助。
【讨论】：
您需要实现代表的协议。在 xcode 中输入函数时可以发现。
【讨论】：