ios - 检查互联网连接时，隐藏的 UIVIEW 无法快速工作

Question

当我试图查明互联网是否活跃时。在检查互联网之前，我尝试显示加载屏幕。但需要上网查询功能结果后才能生效。

我的互联网检查代码是

class Activeinternet: UIViewController {


class func isConnectedToNetwork() -> Bool {

    var Status:Bool = false
    let url = NSURL(string: "https://google.com/")
    let request = NSMutableURLRequest(url: url! as URL)
    request.httpMethod = "HEAD"
    request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringLocalAndRemoteCacheData
    request.timeoutInterval = 4.0
    var response: URLResponse?
    var urlData: NSData?
    do {
        urlData = try NSURLConnection.sendSynchronousRequest(request as URLRequest as URLRequest, returning:&response) as NSData
    } catch let error as NSError {
        // reponseError = error
        urlData = nil
    }



    if let httpResponse = response as? HTTPURLResponse {
        if httpResponse.statusCode == 200 {
            Status = true
        }
    }

    return Status

}


}

调用互联网检查

self.internetloadsview.isHidden = false
self.internetloadsindicator.startAnimating()
if Activeinternet.isConnectedToNetwork() == true {
    self.internetloadsview.isHidden = true
    self.internetdwnmsg.isHidden = true
}
else{
    self.internetdwnmsg.isHidden = false
}

一切正常。但是

self.internetloadsview.isHidden = false
self.internetloadsindicator.startAnimating()

此代码在主动互联网检查结果后工作

我想在互联网事件 isConnectedToNetwork 调用之前显示 uiview

提前致谢

Answer 1

您正在以阻塞主线程的同步方式调用它。您必须在async中调用它并在完成处理程序中处理调用。

func isConnectedToNetwork( completionHandler completion: @escaping (Bool)-> Void) {

    if let url = URL(string: "https://google.com/") {
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        let task = URLSession.shared.dataTask(with: request) {
            data, response, error in

            if error == nil {
                completion(true)
            } else {
                completion(false)
            }
        }
        task.resume()
    }
}

并使用这样的完成 block 调用此函数

 isConnectedToNetwork { (isSuccess) in
        if isSuccess {
            DispatchQueue.main.async {
                self.label1.text = "Internet is Connected"
            }
        }
        else{
            DispatchQueue.main.async {
                self.label1.text = "Internet is not connected"

            }
        }

    }