Find UIAlertView without having reference to it iOS 7 - ios

Question

I was using a code snippet in my project answered here: UIAlertView without having reference to it
Here's the code:
+ (UIAlertView *) getUIAlertViewIfShown {
if ([[[UIApplication sharedApplication] windows] count] == 1) {
return nil;
}
UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
if ([window.subviews count] > 0) {
UIView *view = [window.subviews objectAtIndex:0];
if ([view isKindOfClass:[UIAlertView class]]) {
return (UIAlertView *) view;
}
}
return nil;
}
Unfortunately its not working in iOS 7 and I'm unable to dismiss an alert view. While debugging I found that in the loop its showing that view is of class UITransitionView. Pretty confusing because I couldn't find any quick documentation for this view class.
Any ideas how can I fix this problem?

Answer 1

In iOS7, the UIAlertView window does not appear in -[UIApplication windows]. In fact, the UIAlertView itself is never added to any window, -[UIAlertView window] is always nil. Instead, the alert view manages a variety of undocumented views placed in -[UIApplication keyWindow] with no reference back to the alert view.
Your only real option in iOS7 is to actually keep track of your alert views.

Answer 2

iOS 7 solution
Class UIAlertManager = objc_getClass("_UIAlertManager");
UIAlertView *topMostAlert = [UIAlertManager performSelector:#selector(topMostAlert)];
I am not sure if it is approvable by AppStore, but works
UPD single line code:
UIAlertView *topMostAlert = [NSClassFromString(#"_UIAlertManager") performSelector:#selector(topMostAlert)];

Answer 3

I have faced similar issue and in my case alerts are displayed from different instance of view controller, As Brian has already mentioned that UIAlertView window does not appear in -[UIApplication windows] in iOS7.
So to keep track of this following approach can be followed -
Define a BOOL constant in App Delegate -
#property (nonatomic, assign) BOOL isAlertVisibleOnAppWindow;
Where 'UIAlerView` is present, check earlier instance existence -
AppDelegate *delegate = (AppDelegate *) [UIApplication sharedApplication].delegate;
if (!delegate.isAlertVisibleOnAppWindow) {
delegate.isAlertVisibleOnAppWindow = YES;
UIAlertView *alertView = [[UIAlertView alloc] init…//alert init code
// Either handle alert cancel/completeion click here via blocks, or use alert delegates to reset the isAlertVisibleOnAppWindow BOOL variable to NO.
}
This might be helpful to some other people, thought of sharing this.

Answer 4

UIAlertView *topMostAlert = [NSClassFromString(#"_UIAlertManager") performSelector:#selector(topMostAlert)];
This will NOT be allowed to publish into Apple Store. During build validation Xcode will throw an error, something like: "access to undocumented method.."
So you can't use it, however this code works well.

Answer 5

You can register to UIWindowDidBecomeVisibleNotification:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(aWindowBecameVisible:)
name:UIWindowDidBecomeVisibleNotification
object:nil];
and in aWindowBecameVisible check the window description for _UIModalItemHostingWin:
if ([[theWindow description] hasPrefix:#"<_UIModalItemHostingWin"])
{
// This is the alert window
}