Change frame programmatically with auto layout

Question

I have a UITableView with Auto Layout and I need to reduce the height when the GADBannerView appears at the bottom of the screen.

Unfortunat

Answer 1

Rather than trying to change the frame of the view, add a height constraint using auto layout and reduce the value of this constraint. Do the below steps:

1. create a height constarint for your view in your interface.

2. Then add an IBOutlet object in your class for this constraint. for example,

    @property (weak, nonatomic) IBOutlet NSLayoutConstraint *heightConstraint;
   

   Connect this object in your connection panel.

3. Then change the value of this constraint whenever you needed

    self.heightConstraint.constant = 40;
   

Answer 2

Let your UITableView constraints to bottom layout is set to 0, make an IBOutlet. Now let your GADBannerView height is 40 so change your outlet.constant = 40; For more about how to make IBOutlet and change its value have a look into this or this hope this will help.

Edit: For those who seeking for example, follow these simple steps (Because this is accepted answer, I think it is worth to have an example. Credit to @manujmv for this example)

1. Create a height constraint for your view in your interface.

2. Then add an IBOutlet object in your class for this constraint. For example:

   @property (weak, nonatomic) IBOutlet NSLayoutConstraint *heightConstraint;

Connect this object in your connection panel.

3. Then change the value of this constraint whenever you needed

   self.heightConstraint.constant = 40;

Answer 3

One more thing, you have to call [self.view layoutIfNeeded]; method once you changne the constraints.

Enjoy :)

Answer 4

You can find out constraint like that

extension UIView {
    var heightConstaint: NSLayoutConstraint? {
        get {
            for constraint: NSLayoutConstraint in constraints {
                if constraint.firstAttribute == .height {
                    if constraint.relation == .equal {
                        return constraint
                    }
                }
            }
            return nil
        }

        set{
            setNeedsLayout()
        }
    }
}