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Kemmy Mary Omoshoro
Kemmy Mary Omoshoro

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Easy way to set constraints for custom object (Button) created programatically in swift & Xcode 13.3.

There are many ways one can create an object on the view in Xcode storyboard.

Using drag-n-drop method:

You may use the direct way, which is using drag-n-drop of object for example a button from the Library to the storyboard viewController and setting the properties of the object (button) on the attribute inspector and setting the constraints in auto-layout.
See below:

Using drag-n-drop method

Creating the a custom button programatically from the ViewController:

In this method, I want to explain and illustrate an easy trick or way to create the object especially a button and placing it at any position you want on the view.

Personal Experience:

I discovered this solution when working on one of my project after upgrading to Xcode 13.3.
I created a custom button using the drag-n-drop method mentioned above, and there was a designable error meaning the storyboard is unable to validate and render the object in my case: a Button.
I fixed the designable error by having to create and set the button properties programmatically.

New issue auto-layout constraint code using NSLayoutContraint crashing the app at runtime:

Then arise a new problem setting the constraints auto-layout using NSLayoutConstraints was not working keeps breaking the code and the app keeps crashing at runtime.

Easy trick used to set the constraint and the outcome:

- Create the button using CGRect class.
- Using the UIScreen Class to set the x & y position of the object(Button) on the view.

Reasons & Observations:

  • I used UIScreen because I don't know the size of the screen, but after using some basic mathematical calculations was able to figure out the position.
  • I observed that if the amount multiplied by 30 is lower the object moves to the right of the screen & if the amount multiplied by 30 is higher moves the object to the left of the screen.
  • To get the horizontal mid-position of the screen using the x-position, one have to twerk and play around with the amount multiplied by 30 and as well use the device simulator horizontal mid-point line to view if the object(Button) is placed at your desired mid-point or position on the device screen or simulator.

Setting the object position

Testing the resulting outcome using different device size:

The resulting outcome of the object(Button) position when tested with other device screen size remain the same.
Here is the outcome and the code below:

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Isn't it amazing ?!, problem solved ! and I hope this article helps someone too.

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