Swift: Location on image filtering out certain parts of the image

Question

I want to have a pop up that records where you have pain on your abdomen (much like myIDB app. So the popup has the image of the body and you tap on there. A red marker shows your selection and you cannot place a mark outside the body. How can I set a filter to not allow input outside an image section?

Any tips at all of where to even look for an answer? – SashaZ Feb 08 '16 at 22:57 — SashaZ, Feb 08 '16 at 22:57

score 0 · Answer 1 · edited May 23 '17 at 12:19

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I found an answer: Stackoverflow answer Where you get the alpha value of touch location. I will save the image with a transparent area outside where I want to touch and then its quite simple to determine if the area I want is touched.

edited May 23 '17 at 12:19

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answered Feb 10 '16 at 17:23

SashaZ

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Swift: Location on image filtering out certain parts of the image

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