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Sizing

Width

view.width(100)

Height

view.height(100)

view ~ (100) is same with view.height(100)

You can use ~ operator for .height(x). It's just more readable in a layout statement that way.

Size

view.size(100)

Constraining multiple views

equalSizes(image1, image2, image2)
equalWidths(field1, field2, field3, field4)
equalHeights(button1, button2)

Constraining a view to stay squared

view.heightEqualsWidth()