Display UIAlertController from UIView/NSObject class

Question

I have working iOS application In order to support iOS8, I am replacing UIAlertView/UIActionSheet with UIAlertController.

Problem :
For display UIAlertController I need presentViewController method of UIViewController class.
But UIAlertView is display from classes which are inherited from UIView or NSObject,
I can not get [self presentViewController...] method for obvious reason.

My Work :
I tried getting rootViewController form current window and display UIAlertController.

[[[UIApplication sharedApplication] keyWindow].rootViewController presentViewController ...] 

but have some rotation problems like if my current view controller do not have rotation support it will rotate if UIAlertController is open.

Question :
Did any one faced same problem and have safe solution ?
if yes please provide me some example or give some guide

Answer 1

I solved an essentially similar problem today. Like Jageen, I ran into a situation where I wanted to present a UIAlertController but from a non-UIViewController class. In my case, I wanted an alert to pop up when the failure block of a HTTP request is run.

This is what I used and unlike our friend here, it worked quite perfectly for me.

UIApplication.sharedApplication().keyWindow?.rootViewController?.presentViewController(errorAlert, animated: true, completion: nil) 

Answer 2

The better solution for UIView classes is below

ObjectiveC

UIViewController *currentTopVC = [self currentTopViewController]; currentTopVC.presentViewController.........   - (UIViewController *)currentTopViewController {     UIViewController *topVC = [[[[UIApplication sharedApplication] delegate] window] rootViewController];     while (topVC.presentedViewController)     {         topVC = topVC.presentedViewController;     }     return topVC; } 

Swift

var topVC = UIApplication.sharedApplication().keyWindow?.rootViewController while((topVC!.presentedViewController) != nil){      topVC = topVC!.presentedViewController } topVC?.presentViewController........