How to calculate number of black colored CGPoint in a view

Question

I have some difficulties in Swift, Xcode I have drawn UIView which has transparent background and I need to calculate the percentage of drawn area in UIView, any ideas? I only know the way by reviewing each cgpoint and getting the value of alpha

score 0 · Accepted Answer · edited May 23 '17 at 10:25

0

Here are the steps to do this :

Go through the each pixel of the UIView
calculate colour of that pixel
Then compare that colour to Black colour Here is the example for retrieving the colour from the pixel : How to get the color of a pixel in an UIView?

edited May 23 '17 at 10:25

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answered Feb 10 '15 at 03:40

V-Xtreme

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Thanks, I was planning to do the same, but I have around 100 Views, it may take quite long, what do you think? – Berdikhan Satenov Feb 10 '15 at 03:47
cant say actual . But depends on processor . But you really have 100 views ? that means 100 screens ? – V-Xtreme Feb 10 '15 at 03:49
Yes, I have 100 pages of pdf file – Berdikhan Satenov Feb 10 '15 at 04:47

How to calculate number of black colored CGPoint in a view

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