brice cesarin brice cesarin - 6 months ago 73
Objective-C Question

UIAlertController Unable to satisfy constraints

I am converting all my

UIActionSheet
and
UIAlertView
with
UIAlertController
.

My problem is when I try to present a
UIAlertController
of style ActionSheet.
Here is my code :

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Title"
message:@"My message"
preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil];
[alert addAction:cancelAction];

UIAlertAction *OKAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
[alert addAction:OKAction];

UIAlertAction *destroyAction = [UIAlertAction actionWithTitle:@"Destroy" style:UIAlertActionStyleDestructive handler:nil];
[alert addAction:destroyAction];

UIPopoverPresentationController *popPresenter = [alert popoverPresentationController];
popPresenter.sourceView = self.view;
popPresenter.sourceRect = self.view.bounds;

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


Here is the error :

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.
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property
translatesAutoresizingMaskIntoConstraints)
(
"<NSLayoutConstraint:0x7c00ab40 H:[UIView:0x7c0764c0(304)]>",
"<NSLayoutConstraint:0x7b6c7f80 _UIAlertControllerView:0x7b6c2e50'title'.width >= UIView:0x7b6c3230.width>",
"<NSLayoutConstraint:0x7ccdfe40 _UIAlertControllerView:0x7b6c2e50'title'.width == UIView:0x7b6efbe0.width>",
"<NSAutoresizingMaskLayoutConstraint:0x7c33b9d0 h=--& v=--& H:[UIView:0x7c1094e0(0)]>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x7c00ab40 H:[UIView:0x7c0764c0(304)]>


Thank you all.

Answer

I found a solution myself :

this comes from the lines :

popPresenter.sourceView = self.view;
popPresenter.sourceRect = self.view.bounds;

I have to set OR a sourceView OR a sourceRect but not both.

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