UIAlertView giving constraint errors

Question

i have the following code to present an alert with different messages when problems occur in my app. the code has worked fine for years, and is in most of my applications on the App Store.

i am making a new app, and simply added this code in, however i am seeing the error messages below in the console, which i can not get rid of.

the constraint message refers to the alert width, but i have no constraints set , and no means to adjust any to silence the warning.

can somebody please advise what's going wrong.

thanks

-(void)errorMessage:(id)sender
{

    UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"Information",)
                                                                   message:displaymessage
                                                            preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction *firstAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK",)
                                                          style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
                                                              [self dismissViewControllerAnimated:NO completion:nil];
                                                          }];

    [alert addAction:firstAction];
    [self presentViewController:alert animated:YES completion:nil];
}

2019-04-18 09:17:54.785207+0100 TestInputView5[1380:28232] [LayoutConstraints] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x600001e15b30 UIView:0x7fe60c6104e0.width == - 16   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x600001e15b30 UIView:0x7fe60c6104e0.width == - 16   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

Are you using Xcode 10.2? Running on iOS 12.2? I've seen this mentioned a couple times... I assume it's an internal constraint conflict, as it doesn't happen with 10.1 / 12.1 (I don't have a 12.2 device to test at the moment). — DonMag, Apr 18 '19 at 19:19
I’m using the latest Xcode with all my simulators updated and get this issue with 12.2 also when on a device. — superllanboy, Apr 20 '19 at 07:43
I did manage to get over my problem by changing from an action sheet to an alert however — superllanboy, Apr 20 '19 at 07:44
Still the action sheet should work right - can you see any issues with my code? — superllanboy, Apr 20 '19 at 07:44

score 1 · Answer 1 · answered Aug 31 '19 at 01:37

1

I have found a solution on a Russian forum. It looks like magic, but it works. You need to do two things: 1) Add an empty view to an Alert 2) Show it without animation

alert.view.addSubview(UIView()) // I can't explain it, but it works!

self.present(alert, animated: false)

Credits to the forum: https://quares.ru/?id=33972

The post is machine-translated, so I suppose there should be an original in English somewhere (I couldn't find it)

answered Aug 31 '19 at 01:37

Leonid Silver

384
4
8

1

Here's the original answer and other solutions: https://stackoverflow.com/questions/55653187/swift-default-alertviewcontroller-breaking-constraints – Yuri Grigoriev Jan 13 '20 at 14:16

UIAlertView giving constraint errors

1 Answers1