ios - How to draw CALayer border around its mask? -


so, have calayer, has mask & want add border around layer's mask. example, have set triangle mask layer , want have border around layer.

can please me solve problem?

some suggestions:

  • use opaque shadow instead of border (you have blurred effect).
  • create layer, set background color color want border, mask mask bigger 1 have simulate border width, , put centered behind layer (may not work every shape).
  • do morphological operation on mask image calculate border, instance vimagedilate family of functions (more complicated, , may run performance problems).
  • if know shape , can described mathematically, draw , stroke explicitly core graphics functions.
  • or, in same case (shape known mathematically), use cashapelayer draw border.

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