我正在制作一个应用程序,通过使用 if else 语句来检测是否有互联网连接,当有互联网时,不执行任何操作,但如果没有互联网连接,则警报视图说该应用程序需要我管理的互联网,但发现可达性在我的 viewDidLoad() 上实现 uialertview 似乎不起作用。
我正在使用这个:
public class Reachability {
class func isConnectedToNetwork() -> Bool {
var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
}
}
var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
return false
}
let isReachable = flags == .reachable
let needsConnection = flags == .connectionRequired
return isReachable && !needsConnection
}
}
然后在我的视图控制器类中:
override func viewDidLoad() {
if Reachability.isConnectedToNetwork() == true
{
print("Connected")
}
else
{
let controller = UIAlertController(title: "No Internet Detected", message: "This app requires an Internet connection", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: nil)
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
controller.addAction(ok)
controller.addAction(cancel)
present(controller, animated: true, completion: nil)
}
super.viewDidLoad()
//...
}
看起来警报视图没有弹出
有什么建议吗?或帮助?
谢谢