How do I change to another view controller when the alert view appears? ideally when I press the 'OK' button I want it to programatically change to another view controller.
The following function is what I need to implement:
func shouldPerformSegueWithIdentifier(_ identifier: String,
sender sender: AnyObject?) -> Bool
Here is my reachability class:
import Foundation
import SystemConfiguration
public class ReachabilityNotification {
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(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, UnsafePointer($0))
}
var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
return false
}
let isReachable = flags == .Reachable
let needsConnection = flags == .ConnectionRequired
return isReachable && !needsConnection
}
}
Here is my ViewController:
import UIKit
import Foundation
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
if Reachability.isConnectedToNetwork() == true {
print("Internet connection OK")
} else {
print("Internet connection FAILED")
let alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK")
alert.show()
}
}
}
Just call the performSegueWithIdentifier(identifier: String, sender: AnyObject?)
function where you want to segue to a new view controller. Make sure you use the same string identifier
as the segue in your storyboard.
Give the following a try:
if ReachabilityNotification.isConnectedToNetwork() == true {
print("Internet connection OK")
} else {
print("Internet connection FAILED")
var connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)
connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
performSegueWithIdentifier("SegueIdentifier", sender: self)
}))
presentViewController(connectionAlert, animated: true, completion: nil)
}
EDIT:
Using viewDidLoad()
is too early in the process to present the UIAlertController
. Try moving your alert into viewDidlAppear
.
import UIKit
import Foundation
class ViewController: UIViewController {
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
if Reachability.isConnectedToNetwork() == true {
print("Internet connection OK")
} else {
print("Internet connection FAILED")
let connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)
connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { [unowned self] (action: UIAlertAction!) in
self.performSegueWithIdentifier("NoConnection", sender: self)
}))
presentViewController(connectionAlert, animated: true, completion: nil)
}
}
}