[英]CFStreamCreatePairWithSocketToHost crashes unexpectedly with Swift
Finally time to ask my first question here! 最后在这里问我的第一个问题!
Up front: Xcode 7.1.1, OS 10.11.2, iOS 9.0.2 (on physical device) 预先:Xcode 7.1.1,OS 10.11.2,iOS 9.0.2(在物理设备上)
I'm writing a small app that communicates with my Raspberry Pi. 我正在写一个与我的Raspberry Pi通信的小应用程序。 I've got some working code that's written in Obj-C (for iOS 7) borrowed from a tutorial , and it all works fine for me in Obj-C (connects and behaves as expected with the Pi).
我有一些工作代码是用Obj-C(iOS 7)编写的,从教程中借用,它在Obj-C中都能正常工作(连接和行为与Pi一样)。 The issue lies with rewriting it for Swift/iOS 9 (which is the goal).
问题在于为Swift / iOS 9重写它(这是目标)。
The good bit: 好一点:
func initNetworkCommunication() {
var readStream: Unmanaged<CFReadStreamRef>?
var writeStream: Unmanaged<CFWriteStreamRef>?
CFStreamCreatePairWithSocketToHost(nil, "192.168.1.22", 777, &readStream, &writeStream)
inputStream = readStream?.takeRetainedValue() as! NSInputStream
outputStream = writeStream?.takeRetainedValue() as! NSOutputStream
inputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
outputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
inputStream.open()
outputStream.open()
}
I believe the issue to lie in the above as this is the last method call in the stack, however the application crashes quietly with little information: 我认为问题在于上面,因为这是堆栈中的最后一个方法调用,但应用程序在很少信息的情况下悄悄崩溃:
Any help would be much appreciated! 任何帮助将非常感激!
Please feel free to ask for more information. 请随时询问更多信息。
ps I understand the formatting on this site is rather "strict", anything I missed, overdid, etc, please let me know :) ps我明白这个网站的格式是相当“严格”,我错过了什么,过度等等,请让我知道:)
I've solved it. 我已经解决了。
Firstly: 首先:
inputStream = readStream?.takeRetainedValue() as! NSInputStream
outputStream = writeStream?.takeRetainedValue() as! NSOutputStream
Should be: 应该:
inputStream = readStream!.takeRetainedValue()
outputStream = writeStream!.takeRetainedValue()
Secondly, I abstracted the connection out of the ViewController (where I had this method initially) to a new class called Connection. 其次,我将ViewController(我最初使用此方法)中的连接抽象为一个名为Connection的新类。
Here's Connection: 这是连接:
import UIKit
class Connection: NSObject, NSStreamDelegate {
var inputStream: NSInputStream!
var outputStream: NSOutputStream!
func connect() {
var readStream: Unmanaged<CFReadStream>?
var writeStream: Unmanaged<CFWriteStream>?
CFStreamCreatePairWithSocketToHost(nil, "192.168.1.22", 777, &readStream, &writeStream)
self.inputStream = readStream!.takeRetainedValue()
self.outputStream = writeStream!.takeRetainedValue()
self.inputStream.delegate = self
self.outputStream.delegate = self
self.inputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.outputStream.scheduleInRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
self.inputStream.open()
self.outputStream.open()
}
}
Often I find starting to type these helps me out :p 通常我发现开始输入这些可以帮助我:p
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