ios - 如何检查应用程序是否已连接到 Internet
<p><p>我希望这个类推送或显示一个 alertView 说它没有连接到互联网</p>
<pre><code>public class Reachability {
class func isConnectedToNetwork()->Bool{
var Status:Bool = false
let url = NSURL(string: "http://google.com/")
let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "HEAD"
request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData
request.timeoutInterval = 10.0
var response: NSURLResponse?
do{
var data = try NSURLConnection.sendSynchronousRequest(request, returningResponse: &response)
print(response)
} catch {
//handle error
print(error)
}
if let httpResponse = response as? NSHTTPURLResponse {
if httpResponse.statusCode == 200 {
Status = true
}
}
return Status
}
}
</code></pre>
<p>这是我在 mainViewcontroller(initial) 中的声明</p>
<pre><code>if Reachability.isConnectedToNetwork() == true {
}else {
dispatch_async(dispatch_get_main_queue(), { () -> Void in
let viewController:UIViewController = (self.storyboard?.instantiateViewControllerWithIdentifier("SignInSignUpVCIdentifier"))!
self.presentViewController(viewController, animated: true, completion: nil)
})
}//end of
</code></pre>
<p>它不会插入任何东西。它显示尝试 2sleep4.34324</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>试试这个检查设备的网络连接</p>
<pre><code>import SystemConfiguration
func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
return false
}
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
return (isReachable && !needsConnection)
}
</code></pre>
<p>在您的函数中添加以下代码以检查网络是否可达并获取警报</p>
<pre><code> if self.isConnectedToNetwork() {
print(self.isConnectedToNetwork())
// isConnectedToNetwork == true
// It comes here when its connected to network
let alertController = UIAlertController(title: "", message: "Connected to internet", preferredStyle: .Alert)
let OKAction = UIAlertAction(title: "OK", style: .Default) { (action:UIAlertAction!) in
print("you have pressed OK button");
}
alertController.addAction(OKAction)
self.presentViewController(alertController, animated: true, completion:nil)
}
else {
print(self.isConnectedToNetwork())
// isConnectedToNetwork == false
// It comes here when its not connected to network
let alertController = UIAlertController(title: "", message: "Not able to connect to internet", preferredStyle: .Alert)
let OKAction = UIAlertAction(title: "OK", style: .Default) { (action:UIAlertAction!) in
print("you have pressed OK button");
}
alertController.addAction(OKAction)
self.presentViewController(alertController, animated: true, completion:nil)
}
</code></pre>
<p>希望这可能会有所帮助</p></p>
<p style="font-size: 20px;">关于ios - 如何检查应用程序是否已连接到 Internet，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/33005603/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/33005603/
</a>
</p>
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