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Equations

Tricky layout cases can be described as equations.

button.CenterY == avatar.Bottom - 4
label.Width <= button.Width * 3
label.Height == (button.Width / 7) + 3
button.Left >= image.Right - 20
image.Height >= 100
view.Top == 10

The result is a native NSLayoutConstraint. So you can modify priority like so :

(label.Width == button.Width * 3).priority = 1000 // Making this a required constraint.