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How to draw a border inside a view

Paul Hudson    @twostraws   

Updated for Xcode 12.0

SwiftUI gives us both stroke() and strokeBorder() modifiers for drawing borders around shapes, and they have subtly different behavior:

  • The strokeBorder() modifier insets the view by half your border width then applies the stroke, meaning that the entire border is drawn inside the view.
  • The stroke() modifier draws a border centered on the view’s edge, meaning that half the border is inside the view and half outside.

Important: Both of these modifiers only apply to shapes – you can use stroke() and strokeBorder() with Circle, Rectangle, Capsule, and so on, but not with Text, Image or other non-shape views. If you want to draw a border around non-shape views, you should use the border() modifier instead – see “How to draw a border around a view”.

If you want to see strokeBorder() in action, try this:

Circle()
    .strokeBorder(Color.blue, lineWidth: 50)

Because that doesn’t specify a frame, that circle will occupy the full width of the screen, and its 50-point blue stroke will be drawn entirely inside the circle.

If you aren’t quite sure of the difference from stroke(), try changing your code to this:

Circle()
    .stroke(Color.blue, lineWidth: 50)

Now you’ll see that the left and right edges of the stroke are cut off, because they fall outside of the screen.

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