CODEWITHSUNDEEP
objective-cuicolor
Marie
Marie

Reputation: 23

How to create similar colour in objective c?

I have this generated colour and want to get three similar colours of mainViewColor

float red = arc4random() % 256 / 255.0;
float green = arc4random() % 256 / 255.0;
float blue = arc4random() % 256 / 255.0;

UIColor *mainViewColor = [UIColor colorWithRed:red green:green blue:blue alpha:1.0];
self.mainView.backgroundColor = mainViewColor;

Upvotes: 0

Views: 39

Answers (1)

pyj
pyj

Reputation: 1499

To get different shades, use UIColor's -getHue:saturation:brightness:alpha: to work with HSB and then create new colors using +colorWithHue:saturation:brightness:alpha:

CGFloat hue, saturation, brightness;
[mainViewColor getHue:&hue saturation:&saturation brightness:&brightness];

// Helper to keep c in "good" range of (0, 1)
CGFloat wrap(CGFloat c) {
  if(c > 1.0f) {
    return c - 1.0f;
  }else if(c < 0.0f) {
    return c + 1.0;
  }
  return c;
}

// Creates 3 "similar" colors with different brightness.
NSMutableArray* similarColors = [NSMutableArray new];
[similarColors addObject:[UIColor colorWithHue:hue saturation:saturation brightness:wrap(brightness + 0.2)]];
[similarColors addObject:[UIColor colorWithHue:hue saturation:saturation brightness:wrap(brightness + 0.4)]];
[similarColors addObject:[UIColor colorWithHue:hue saturation:saturation brightness:wrap(brightness - 0.2)]];

Upvotes: 1

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