How to programmatically create layout and constraints using Swift IOS

Question

How do you programmatically create layout and constraints using Swift IOS. I'm familiar with storyboards, however I'm not sure how to use code to make ui elements.

Shiv Nik · Accepted Answer · 2022-07-07 17:09:34Z

2

There are three main steps. First you have to define the element, add it to the view, then add constraints.

For example,

let button = UIButton() 
button.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(button) 

NSLayoutConstraint.activate([
        button.heightAnchor.constraint(equalTo: view.heightAnchor)
      
        
])

answered Jul 7, 2022 at 17:09

Shiv Nik

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2 Comments

Duncan C Over a year ago

Note the translatesAutoresizingMaskIntoConstraints = false bit. That's important. If you forget that part, the system adds a bunch of constraints that attempt to simulate "struts and springs" auto resizing masks, which will then conflict with your AutoLayout constraints.

Duncan C Over a year ago

Also note that there at least 3 different ways to create auto layout constraints. Using layout anchors as in this answer seems the easiest way to me. (Voted)

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