Question

一直关注本教程：

http://www.appcoda.com/intro-multipeer-connectivity-framework-ios-programming/

但是一直在转换它在Swift中工作。然而，已经取消了以下内容：

-(void)peerDidChangeStateWithNotification:(NSNotification *)notification
    {
        MCPeerID *peerID = [[notification userInfo] objectForKey:@"peerID"];
        NSString *peerDisplayName = peerID.displayName;
        MCSessionState state = [[[notification userInfo] objectForKey:@"state"] intValue];

这是导致麻烦的最后一行，我已经做到了这一点：

func peerDidChangeStateWithNotification(notification: NSNotification)
{
    if let userInfo : AnyObject = notification.userInfo? {
        let peerID = userInfo["peerID"] as MCPeerID
        let state = userInfo["state"] as MCSessionState

但无法将“state”条目输入MCSessionState类型，得到错误：

'AnyObject' is not convertible to 'MCSessionState'

任何人都可以帮忙......？对Swift来说很新，很抱歉，如果这是一个明显的...

非常感谢，佛朗哥。

更新9sep：

首先设置userInfo对象的代码如下所示，据我所知调用toRaw（）方法应该只是意味着它将它视为存储Int ...？在这种情况下，我不知道为什么你的原始答案不起作用......

func session(session: MCSession!, peer peerID: MCPeerID!, didChangeState state: MCSessionState)
{

    var dict = ["peerID": peerID, "state": state.toRaw()]

    NSNotificationCenter.defaultCenter().postNotificationName("MCDidChangeStateNotification", object: nil, userInfo: dict)

}

更新2 9sep：

知道了！如果其他人正在遵循相同的教程，则转换函数的完整工作版本如下所示。非常感谢你的帮助Edwin Vermeer：

func peerDidChangeStateWithNotification(notification: NSNotification)
{
    if let userInfo : AnyObject = notification.userInfo?
    {
        let peerID = userInfo["peerID"] as MCPeerID
        let peerDisplayName = peerID.displayName
        let state: MCSessionState = MCSessionState.fromRaw(Int(userInfo["state"] as NSNumber)) as MCSessionState!

        if (state != MCSessionState.Connecting)
        {
            if (state == MCSessionState.Connected)
            {
                arrayConnectedDevices.append(peerDisplayName)
            }
            else if (state == MCSessionState.NotConnected)
            {
                if (arrayConnectedDevices.count > 0)
                {
                    if let i = find(arrayConnectedDevices, peerDisplayName)
                    {
                        arrayConnectedDevices.removeAtIndex(i)
                    }
                }
            }
        }
    }
}

Answer 1

您可以使用它将int转换为枚举：

let state: MCSessionState = MCSessionState.fromRaw(Int(userInfo["state"] as NSNumber)) as MCSessionState!

尝试在Swift中的多重连接测试应用程序中使用NSNotification

1 个答案: