[英]iOS: UIWindow.rootViewController must be used from main thread only
我有一个问题
if let wd = UIApplication.shared.delegate?.window {
var vc = wd!.rootViewController
如果我将这段代码放在Dispatch中,警告消息会消失,但是应用程序无法正确显示。 如果我删除该调度,则有警告消息。
UIWindow.rootViewController必须仅在主线程中使用
和
UIApplication.delegate必须仅在主线程中使用
该类专门用于使用progressBar下载。
public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print("Download finished: \(location)")
...
do {
let result = try FileManager.default.replaceItemAt(URL(fileURLWithPath: Constants.Path.temp.stringByAppendingPathComponent(path: "temp.zip")), withItemAt: URL(fileURLWithPath: location.path))
let source = Constants.Path.tempZipFile
let destination = Constants.Path.temp.stringByAppendingPathComponent(path: "dezipped")
var myDict = [String:Any]()
myDict["source"] = source
myDict["destination"] = destination
DispatchQueue.main.async { //IF I REMOVE THIS => PB OR THREAD IN MAIN
if let wd = UIApplication.shared.delegate?.window {
var vc = wd!.rootViewController
if(vc is UINavigationController){
vc = (vc as! UINavigationController).visibleViewController
}
if(vc is WebViewController){
NotificationCenter.default.post(name: .DeflatSynchroFilesWebView, object: myDict, userInfo: nil)
}
else
{
NotificationCenter.default.post(name: .DeflatSynchroFiles, object: myDict, userInfo: nil)
}
}
}
} catch let writeError as NSError {
print("error writing file temp.zip to temp folder")
}
提前致谢。
我不确定这是否有帮助,但是我总是使用以下rootViewController
来获取rootViewController
:
if let window = UIApplication.shared.keyWindow?.rootViewController {
}
没有代表
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