UIAlertView/UIAlertController iOS 7 and iOS 8 compatibility

Question

I am using Swift to write an app and I need to show an alert. The app must be iOS 7 and iOS 8 compatible. Since UIAlertView has been replaced with UIAlert

Answer 1

For non-swift code, pure objective-C do this

if ([UIAlertController class])
    {
        // use UIAlertController
        UIAlertController *alert= [UIAlertController
                                      alertControllerWithTitle:@"Enter Folder Name"
                                      message:@"Keep it short and sweet"
                                      preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction* ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault
                                                   handler:^(UIAlertAction * action){
                                                       //Do Some action here
                                                       UITextField *textField = alert.textFields[0];
                                                       NSLog(@"text was %@", textField.text);

                                                   }];
        UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
                                                       handler:^(UIAlertAction * action) {

                                                           NSLog(@"cancel btn");

                                                           [alert dismissViewControllerAnimated:YES completion:nil];

                                                       }];

        [alert addAction:ok];
        [alert addAction:cancel];

        [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
            textField.placeholder = @"folder name";
            textField.keyboardType = UIKeyboardTypeDefault;
        }];

        [self presentViewController:alert animated:YES completion:nil];

    }
    else
    {
        // use UIAlertView
        UIAlertView* dialog = [[UIAlertView alloc] initWithTitle:@"Enter Folder Name"
                                                         message:@"Keep it short and sweet"
                                                        delegate:self
                                               cancelButtonTitle:@"Cancel"
                                               otherButtonTitles:@"OK", nil];

        dialog.alertViewStyle = UIAlertViewStylePlainTextInput;
        dialog.tag = 400;
        [dialog show];

    }

Answer 2

Try below code. It works fine for both iOS 8 and below version.

if (IS_OS_8_OR_LATER) {
    UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:title message:msg preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction *cancelAction = [UIAlertAction
                                 actionWithTitle:@"OK"
                                 style:UIAlertActionStyleCancel
                                 handler:^(UIAlertAction *action)
                                 {

                                 }];
    [alertVC addAction:cancelAction];

    [[[[[UIApplication sharedApplication] windows] objectAtIndex:0] rootViewController] presentViewController:alertVC animated:YES completion:^{

    }];
}
else{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:msg delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
    [alert show];
}

Answer 3

You can resolve your issue using this code :-

var device : UIDevice = UIDevice.currentDevice()!;
        var systemVersion = device.systemVersion;
        var iosVerion : Float = systemVersion.bridgeToObjectiveC().floatValue;
        if(iosVerion < 8.0) {
            let alert = UIAlertView()
            alert.title = "Noop"
            alert.message = "Nothing to verify"
            alert.addButtonWithTitle("Click")
            alert.show()
        }else{
            var alert : UIAlertController = UIAlertController(title: "Noop", message: "Nothing to verify", preferredStyle: UIAlertControllerStyle.Alert)
            alert.addAction(UIAlertAction(title: "Click", style:.Default, handler: nil))
            self.presentViewController(alert, animated: true, completion: nil)
        }

and UIKit had to be marked Optional rather than Required.

Courtsey :- Alert that can work on iOS 7 and iOS 8

Answer 4

Here to check two way of UIAlertView and UIAlertContoller.

Check 1 : iOS verstion check UIAlertController Class.

    if #available(iOS 8.0, *) {

        // UIALertController
        let alert = UIAlertController(title: "Alert", message: "Alert after 8.0", preferredStyle: .Alert)
        let cancelAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
        alert.addAction(cancelAction)
        presentViewController(alert, animated: true, completion: nil)
    } else {

        // UIALertView
        UIAlertView(title: "Alert", message: "Alert below iOS V 8.0", delegate: nil, cancelButtonTitle: "OK").show()
    }

Check 2 : check UIAlertController nil then iOS version below 8.0.

    if objc_getClass("UIAlertController") != nil {

        // UIALertController
        let alert = UIAlertController(title: "Alert", message: "Alert after 8.0", preferredStyle: .Alert)
        let cancelAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
        alert.addAction(cancelAction)
        presentViewController(alert, animated: true, completion: nil)

    }
    else {

        // UIALertView
        UIAlertView(title: "Alert", message: "Alert below iOS V 8.0", delegate: nil, cancelButtonTitle: "OK").show()
    }

Answer 5

If this is shared code, and there is the possibility that the code can be used in an iOS 8 extension (where UIAlertView and UIActionSheet are restricted APIs) as well as iOS 7, where UIAlertController does not exist, have a look at: JVAlertController

It is an API-compatible back-port of UIAlertController to iOS 7, that I undertook to make SDK code safe for use in both iOS 7 and iOS 8 extensions.

Answer 6

In iOS8, there is a new class UIAlertController that replaces UIAlertView and UIActionSheet. From iOS8 on, use UIAlertController, and for iOS8 and before use UIAlertView and UIActionSheet. I think that iOS8 added size classes that change UIAlertView display direction. See: https://github.com/wangyangcc/FYAlertManage