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Updated 26 February 2021
AutoLayout constraints allow us to create views that dynamically adjust to the size and position of all the views in your view hierarchy. It was introduced in iOS6.
We need to set the translatesAutoresizingMaskIntoConstraints to false. This is to prevent the view’s auto-resizing mask to be translated into AutoLayout constraints and affecting your constraints.
Secondly, you need to create an array of constraints. In which you define your constraints:
The above example shows the basics of writing constraints and should be both readable and understandable. However, creates a square and centers in its super view. Similarly, the last line is needed to actually activate the constraints so they make your layout appear as expected.
Each UIView comes with a collection of anchor properties that allow you to set up relations between views:
Similarly, each Anchor returns subclasses from NSLayoutAnchor which comes with a few common methods to set relationships. In addition, includes equal to, greater than, and less than or equal to the relationship.
Each and every UIView comes with few layout guides which can also be used as anchors.
You can also use leadingAnchor and trailingAnchor for leftAnchor and rightAnchor. In conclusion, it will lead to support for Right-to-Left languages to your views. This is mostly important for views like labels in which you want to make sure that they get flipped for Right-to-Left languages.
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