I have tried to find an answer to this for a while. What I want to do is to change the constraints of a ViewController in relation with his "father". Here is what I tried to do, but I get an error:
partial void BackAction(Foundation.NSObject sender)
{
/// My "parent" view controller - the one that presented this view
UIViewController ApplicationViewController = Application.GetPresentedViewController("ApplicationViewController");
/// Here I am trying to update the constrains in relation with his father
View.AddConstraint(NSLayoutConstraint.Create(ApplicationViewController.View, NSLayoutAttribute.LeftMargin, NSLayoutRelation.Equal, 1, 30));
/// and also let the view digest the constrains
View.UpdateConstraints();
}
When I am adding the constraints, I get this error:
Objective-C exception thrown.
Name: NSInvalidArgumentException
Reason: NSLayoutConstraint for <UILayoutContainerView: 0x104903e70; frame = (0 0; 375 812); autoresize = W+H; layer = <CALayer: 0x1c802ff20>>:
A multiplier of 0 or a nil second item together with a location for the first attribute creates an illegal constraint of a location equal to a constant.
Location attributes must be specified in pairs.
Please help me find out, thanks
You need to add the missing view parameter.
Create(NSObject, NSLayoutAttribute, NSLayoutRelation, NSObject, NSLayoutAttribute, nfloat, nfloat)
View.AddConstraint(NSLayoutConstraint.Create(ApplicationViewController.View, NSLayoutAttribute.LeftMargin, NSLayoutRelation.Equal,View,NSLayoutAttribute.LeftMargin,1, 30));
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