UIView above UIAlertView

Question

In my app, a lock screen is used. Sometimes a UIAlertView is shown, now when the user sends the app to the background and brings it in front again, the UIAlertview is shown above the lock screen. Is there a possibility to add a UIViewController's view above everything, i.e. above the UIAlertView?

Smiler sort of problem to what you need to do, so I hope it helps. https://stackoverflow.com/questions/22241412/add-uiview-banner-above-status-bar-ios-7 — BooRanger, Jun 17 '14 at 11:47
One way to sidestep the problem might be to maintain a reference of your `UIAlertView`, and hide it when the app enters the background. When the app enters the foreground again, it's up to you to decide what you do with the alertView reference. — Vinod Vishwanath, Jun 17 '14 at 11:48
Good question. But I think `UIAlertView` is supposed to be on top of everything - that's its duty - to alert. — Unheilig, Jun 17 '14 at 12:00

score 5 · Accepted Answer · answered Jun 17 '14 at 11:52

You should have like this

UIWindow *mySpecialWindowForLockScreen = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];

//"Hey iOS Please put this window above all alert view"
mySpecialWindowForLockScreen.windowLevel = UIWindowLevelAlert+100;

UIViewController *lockScreenViewController = [[UIViewController alloc]init];//Lock Screen

lockScreenViewController.view.frame = mySpecialWindowForLockScreen.bounds;

mySpecialWindowForLockScreen.rootViewController = lockScreenViewController;


// In lockScreenViewController view you can add lock screen images and other UI stuff
mySpecialWindowForLockScreen.rootViewController.view.backgroundColor = [UIColor greenColor];

[mySpecialWindowForLockScreen makeKeyAndVisible];

Whenever you want to hide the LockScreen window then simply hide it by setHidden:YES.

now it works for me as well; the problem was that ARC cleaned up the ```mySpecialWindowForLockScreen``` immediately, therefore I had to make a property for it. — swalkner, Jun 18 '14 at 11:29

score 2 · Answer 2 · answered Jun 17 '14 at 11:45

There are three kind of UIWindowLevel, the biggest one will be shown above the other window.

So I suggest you use a UIWindow to create your lock screen and let it's window level bigger than UIWindowLevelAlert,

Basically, their values are :

 UIWindowLevelNormal = 0.000000;
 UIWindowLevel UIWindowLevelAlert = 2000.000000;
 UIWindowLevel UIWindowLevelStatusBar = 1000.000000;

so that's why the alert view will show above the other window.have a try.

UIView above UIAlertView

2 Answers2

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