MultipeerConnectivity会话管理

Question

我现在真的陷入困境,试图掌握MultipeerConnectivityFramework中的邀请.

现在我有一个充当广告商的ipad应用程序和充当浏览器的iphone应用程序.我已经为MultipeerFramework实现了一个sharedService并执行了以下操作:

广告

@implementation MultipeerConnectivityService {
    MCNearbyServiceAdvertiser *_advertiser;
    MCSession *_session;
    MCNearbyServiceBrowser *_browser;        
}

- (void)automaticAdvertiseWithName:(NSString *)name {
    MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:name];
    _session = [[MCSession alloc] initWithPeer:peerID];
    _session.delegate = self;

    _advertiser = [[MCNearbyServiceAdvertiser alloc] initWithPeer:peerID discoveryInfo:nil serviceType:kServiceType];
    _advertiser.delegate = self;
    [_advertiser startAdvertisingPeer];
}

- (void)advertiser:(MCNearbyServiceAdvertiser *)advertiser didReceiveInvitationFromPeer:(MCPeerID *)peerID withContext:(NSData *)context invitationHandler:(void (^)(BOOL, MCSession *))invitationHandler {
    invitationHandler([@YES boolValue], _session);
    NSLog(@"Invitation accepted");
}

浏览器

- (void)automaticBrowsingWithName:(NSString *)name {
    MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:name];
    _browser = [[MCNearbyServiceBrowser alloc] initWithPeer:peerID serviceType:kServiceType];
    _browser.delegate = self;
    [_browser startBrowsingForPeers];
}

- (void)browser:(MCNearbyServiceBrowser *)browser didNotStartBrowsingForPeers:(NSError *)error {
    if ([_delegate respondsToSelector:@selector(browser:didNotStartBrowsingForPeers:)]) {
        [_delegate browserDidNotStartBrowsingForPeers];
    }
}
- (void)browser:(MCNearbyServiceBrowser *)browser foundPeer:(MCPeerID *)peerID withDiscoveryInfo:(NSDictionary *)info {
    [browser invitePeer:peerID toSession:[self getMCSession] withContext:nil timeout:10];
    if ([_delegate respondsToSelector:@selector(browser:foundPeer:)]) {
        [_delegate browser:browser foundPeer:peerID];
    }
}
- (void)browser:(MCNearbyServiceBrowser *)browser lostPeer:(MCPeerID *)peerID {
    if ([_delegate respondsToSelector:@selector(browserLostPeer:)]) {
        [_delegate browserLostPeer:peerID];
    }
}

- (MCSession *) getMCSession {
    return _session;
}

但后来我在控制台中得到了反馈:

-[MCNearbyServiceBrowser invitePeer:toSession:withContext:timeout:] Bad argument session=nil

当我检查找到的广告商时,一切正常.我的广告客户ipad正在被发现.但是我如何管理邀请？

所以我现在不明白......当我通过浏览器发送邀请时,我必须使用哪个会话？在iPad上我设置了会话,就像你在"automaticAdvertiseWithName"方法中看到的那样.但在iPhone上我调用"automaticBrowsingWithName"时不这样做......这是问题吗？难道他们不必是同一个会话才能成功连接它们吗？我如何成功邀请我的广告客户ipad到浏览器？

当广告商已创建新会话时,我对创建新会话的概念感到困惑.

我实际上不确定,如果代表didReceiveInvitation将对等体添加到connectedPeers中.

- (void)automaticAdvertiseWithName:(NSString *)name {
    MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:name];
    self.session = [[MCSession alloc] initWithPeer:peerID];
    self.session.delegate = self;
    _advertiser = [[MCNearbyServiceAdvertiser alloc] initWithPeer:peerID discoveryInfo:nil serviceType:kServiceType];
    _advertiser.delegate = self;
    [_advertiser startAdvertisingPeer];
}
- (void)advertiser:(MCNearbyServiceAdvertiser *)advertiser didReceiveInvitationFromPeer:(MCPeerID *)peerID withContext:(NSData *)context invitationHandler:(void (^)(BOOL, MCSession *))invitationHandler {
    BOOL accept = YES;
    invitationHandler(accept, self.session);
    NSLog(@"Invitation accepted: %@", self.session);
}

当我在会话中调用属性"connectedPeers"时,即使代理找到了一个,也没有连接的对等体.我在那里弄错了吗？

Answer 1

您的问题是，在您调用 informPeer:toSession:withContext:timeout 时，您的会话为空...无论如何，您有两种选择来解决此问题。

您有两个选择：
选项 1 - 将peerID 创建、会话创建和会话委托分配移至始终执行的位置。例如，在 MultipeerConnectivityService 类的初始化代码中，如果它是 viewDidLoad 中的 UIViewController。

选项 2 - 在调用“invitePeer:toSession:withContext:timeout:”之前添加以下代码片段

if (!_session) {
      MCPeerID *peerID = [[MCPeerID alloc] initWithDisplayName:@"Browser"]; // you can customize the name here
     _session = [[MCSession alloc] initWithPeer:peerID];
     _session.delegate = self;
}

希望这有帮助，祝你好运！