关于ios：UIKeyboardTaskQueue只能从主线程调用

UIKeyboardTaskQueue may only be called from the main thread

我在尝试创建一个自动创建POST请求，发送请求，获取响应并处理它们的功能时遇到问题，然后显示UIAlertView告诉用户这是什么问题。

这是我的代码：

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let task = session.dataTaskWithRequest(request, completionHandler:{ (data, response, error) -> Void in

dispatch_async(dispatch_get_main_queue(),{
var alert = UIAlertController(title:"Chargement", message:"Envoi des informations...", preferredStyle: UIAlertControllerStyle.Alert)
viewController.presentViewController(alert, animated: true, completion: nil)

answer = NSString(data: data!, encoding: NSUTF8StringEncoding)!
print(answer)
var complete = false
alert.dismissViewControllerAnimated(true, completion: { () -> Void in
complete = true
})

while(!complete)
{

}
var textmsg: String
if(answer =="#400")
{
textmsg ="Il manque une information !"
}
else if(answer =="#50")
{
textmsg ="Le compte fourni ne correspond pas."
}
else if(answer =="#100")
{
textmsg ="Impossible d'identifier l'application."
}
else if(answer =="#1")
{
textmsg ="Transfert termin?? avec succ?¨s !"
}
else {
textmsg ="Echec du transfert."
}
let alertComplete = UIAlertController(title:"Chargement", message: textmsg, preferredStyle: UIAlertControllerStyle.Alert)
alertComplete.addAction(UIAlertAction(title:"Ok", style: UIAlertActionStyle.Default, handler: nil))
viewController.presentViewController(alertComplete, animated: true, completion: nil)
})
})

task.resume();

错误代码如下：

1	Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread.'

当我的请求返回错误响应(#400，#50，#100)时，代码可以工作并显示UIAlertView，但如果响应良好，它会给我上述错误代码。

您应该在主线程上调用UIAlertController，因为您正在处理ui。

Swift 2.X

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dispatch_async(dispatch_get_main_queue(),{
var alert = UIAlertController(title:"Chargement", message:"Envoi des informations...", preferredStyle: UIAlertControllerStyle.Alert)
viewController.presentViewController(alert, animated: true, completion: nil)

answer = NSString(data: data!, encoding: NSUTF8StringEncoding)!
print(answer)
var complete = false
alert.dismissViewControllerAnimated(true, completion: { () -> Void in
complete = true
})
while(!complete)
{

}
}

迅捷4.2

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DispatchQueue.main.async {
var alert = UIAlertController(title:"Chargement", message:"Envoi des informations...", preferredStyle: UIAlertControllerStyle.Alert)
viewController.presentViewController(alert, animated: true, completion: nil)

let answer = String(data: data!, encoding: .utf8)!
print(answer)
var complete = false
alert.dismissViewControllerAnimated(true, completion: { () -> Void in
complete = true
})
while(!complete)
{

}
}