ios之iphone 上的 NSStream 无法正常工作

  func connect(host: String, port: Int) 
{ 
 
    self.host = host 
    self.port = port 
 
    NSStream.getStreamsToHostWithName(host, port: port, inputStream: &inputStream, outputStream: &outputStream) 
 
    if inputStream != nil && outputStream != nil 
    { 
        // Set delegate 
        inputStream!.delegate = self 
        outputStream!.delegate = self 
 
        // Schedule 
        inputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode) 
        outputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode) 
 
        // Open! 
        inputStream!.open() 
        outputStream!.open() 
    } 
} 

当我在 XCode 模拟器中启动上面的代码时它可以工作，但是当我在我的 iPhone 上启动它时出现以下错误:

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因:“+[NSStream getStreamsToHostWithName:port:inputStream:outputStream:]: 无法识别的选择器发送到类 0x3b81786c”

请您参考如下方法:

getStreamsToHostWithName(_:port:inputStream:outputStream:) in NSStream 在 iOS 7 中不可用。它在 iOS 8 中引入。

extension NSStream { 
 
    @availability(iOS, introduced=8.0) 
    class func getStreamsToHostWithName(hostname: String, port: Int, inputStream: AutoreleasingUnsafeMutablePointer<NSInputStream?>, outputStream: AutoreleasingUnsafeMutablePointer<NSOutputStream?>) 
} 

您必须改用 CFStreamCreatePairWithSocketToHost:

class Connection: NSObject, NSStreamDelegate { 
 
    var inputStream:NSInputStream? 
    var outputStream:NSOutputStream? 
 
    func connect(host: String, port: Int) { 
 
        var inStreamUnmanaged:Unmanaged<CFReadStream>? 
        var outStreamUnmanaged:Unmanaged<CFWriteStream>? 
        CFStreamCreatePairWithSocketToHost(nil, host, UInt32(port), &inStreamUnmanaged, &outStreamUnmanaged) 
        inputStream = inStreamUnmanaged?.takeRetainedValue() 
        outputStream = outStreamUnmanaged?.takeRetainedValue() 
 
        if inputStream != nil && outputStream != nil { 
            // Set delegate 
            inputStream!.delegate = self 
            outputStream!.delegate = self 
 
            // Schedule 
            inputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode) 
            outputStream!.scheduleInRunLoop(.mainRunLoop(), forMode: NSDefaultRunLoopMode) 
 
            // Open! 
            inputStream!.open() 
            outputStream!.open() 
        } 
    }