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[英]swift 4 error : '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread
[英]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函数时遇到问题,然后显示UIAlertView告诉用户这是什么问题。
这是我的代码:
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 terminé avec succès !"
}
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:
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的响应(#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。
斯威夫特2.X
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)
{
}
}
斯威夫特4.2
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)
{
}
}
快速3.x和4.x
DispatchQueue.main.async(execute: {
// work Needs to be done
})
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