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Asked: 2026-06-11T21:36:40+00:00

Can someone explain to me why this is always always getting only one color

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Can someone explain to me why this is always always getting only one color (which is yellow)? The only change I could make is by changing the value of blue. If I put blue as 0, then everything becomes white. I really don’t get it….I thought I would be getting a wide range of colors between red and (yellow and) green.

int randomNum = arc4random()%255;

int greenLevel;
greenLevel = 255-randomNum;

NSLog(@"%i",greenLevel);

if (posi==NO){
    greenLevel=randomNum;
}


CGContextSetRGBFillColor(contextRef, 244, greenLevel, 30, 1);
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1 Answer

  1. Editorial Team

    First, what is the greenLevel for?

    Why not just use…

    int randomNum = arc4random()%256;

CGContextSetRGBFillColor(contextRef, 244.0 / 255.0, randomNum / 255.0, 30 / 255.0, 1);

    Much tidier.

    Second, the range for specifying colors is from 0 to 1 so you’ll need to divide your 255 colours by 255 in order to get them for iOS.

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