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.

Unfortunately with Auto Layout it is impossible to modify the frame. The solution is to remove Auto Layout and set the frame manually. This is very dangerous because all my apps works fine on 3.5' and 4.0' displays and removing Auto Layout adds a new testing phase and more effort.

Is there a way to change the frame even if Auto Layout is enabled?

create an outlet for your constraint and change its value whenever your `GADBannerView` appear. — Bharat, May 14 '14 at 12:44
[How to update the constant height constraint of a UIView programatically?](https://stackoverflow.com/a/49776158/6822622) — AshvinGudaliya, Oct 24 '18 at 07:20

score 64 · Accepted Answer · edited May 23 '17 at 11:47

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)

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

Then change the value of this constraint whenever you needed

self.heightConstraint.constant = 40;

A bit late to the party, but adding `self.translatesAutoresizingMaskIntoConstraints = YES;` to your view would have probably removed the need for modifying constraint constants. — John Rogers, May 13 '15 at 00:48

score 41 · Answer 2 · answered May 14 '14 at 12:54

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:

create a height constarint for your view in your interface.
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.
Then change the value of this constraint whenever you needed
```
 self.heightConstraint.constant = 40;
```

score 7 · Answer 3 · answered Aug 13 '15 at 09:19

7

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

Enjoy :)

answered Aug 13 '15 at 09:19

RJ168

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score 2 · Answer 4 · answered Mar 31 '18 at 07:05

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()
        }
    }
}

Change frame programmatically with auto layout

4 Answers4

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