重新连接断开的同龄人 [英] Reconnecting to disconnected peers

问题描述

我用我的应用程序了iOS 7 Multipeer框架，但我遇到与设备断开的问题。如果我在两个设备打开应用程序：设备A和设备B两台设备相互连接自动。然而，在从设备B即几秒钟装置的断开起初的连接是这样的：

I'm using the iOS 7 Multipeer framework in my app but I'm experiencing a problem with devices disconnecting. If I open the app in two devices: device A and device B the two devices connect to each other automatically. However, after several seconds device A disconnects from device B. i.e. At first the connection is like this:

A ---> B
A <--- B

几秒钟后：

A ---> B
A      B

设备维护它的连接，但设备B获取一个MCSessionStateNotConnected。

Device A maintains it's connection but device B get's a MCSessionStateNotConnected.

这意味着A发送数据到B，但B不能回答。我试图通过该设备是否连接检查来解决这个问题，如果不是的话，重新启动使用该连接：

This means that A can send data to B but B can't reply. I tried to get around this by checking if the device is connected and if it's not, re-initiating the connection using:

[browser invitePeer:peerID toSession:_session withContext:Nil timeout:10];

但didChangeState回调先手与MCSessionStateNotConnected调用。

But the didChangeState callback just get's called with MCSessionStateNotConnected.

奇怪的是，如果我的应用程序发送A到后台，然后重新打开它，B重新连接到它，并保持连接。

Strangely if I send app A to the background, then re-open it, B reconnects to it and the connection is maintained.

该Multipeer API（和文档）似乎有点稀疏，所以我假定这将只是工作。在这种情况下，我应该如何在设备重新连接？

The Multipeer API (and documentation) seems a bit sparse so I was assuming that it would just work. In this situation how should I re-connect the device?

推荐答案

我有同样的问题，它似乎在同一时间已涉及到我的应用程序浏览和广告，并发送/接受两份邀请。当我停止这样做，让一个对等推迟到其他的邀请函设备仍保持连接状态。

I was having the same problem, and it seems to have been related to my app browsing and advertising at the same time, and two invitations being sent/accepted. When I stopped doing this and let one peer defer to the other for invitations the devices stayed connected.

在我的浏览器委托我检查的散列值的发现同行的显示名，只发送邀请函，如果我的同行中有较高的哈希值：

In my browser delegate I'm checking the hash value of the discovered peer's displayName and only sending an invitation if my peer has a higher hash value:

修改

正如@Masa指出散的价值的NSString 将在32位和64位器件不同，所以它的安全使用比较方法上的显示名。

As pointed out by @Masa the hash value of an NSString will be different on 32 and 64 bit devices, so it's safer to use the compare: method on displayName.

- (void)browser:(MCNearbyServiceBrowser *)browser foundPeer:(MCPeerID *)peerID withDiscoveryInfo:(NSDictionary *)info {

    NSLog(@"Browser found peer ID %@",peerID.displayName);       

    //displayName is created with [[NSUUID UUID] UUIDString]

    BOOL shouldInvite = ([_myPeerID.displayName compare:peerID.displayName]==NSOrderedDescending);

    if (shouldInvite)
        [browser invitePeer:peerID toSession:_session withContext:nil timeout:1.0];
    else
        NSLog(@"Not inviting");
}

正如你所说，该文件是稀疏如此谁知道苹果真的要我们做，但我已经对发送和使用一个会话接受邀请，同时也创造了接受邀请每一个新的会话试验/发，但做事的这种特别的方式给了我最大的成功。

As you say, the documentation is sparse so who knows what Apple really wants us to do, but I've experimented with both sending and accepting invitations using a single session, and also creating a new session for each invitation accepted/sent, but this particular way of doing things has given me the most success.

这篇关于重新连接断开的同龄人的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！