How can I display the spinning NSProgressIndicator in a different color?

Question

I am using a \"spinner\" NSProgressIndicator in my cocoa app:

I would like to display it in a different color so that it will show up well on a dark backgr

Answer 1

For a more fine grained solution, you can use a polynomial color approach using the following Category. Please note that for simplicity I use only the x component of the vectors. For more accurate color matching please see reference at: https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIColorMatrix

@import QuartzCore;
#import 

@interface NSProgressIndicator (Colors)

- (void)setCustomColor:(NSColor *)aColor;

@end

@implementation NSProgressIndicator (Colors)

- (void)setCustomColor:(NSColor *)aColor {
    CIFilter *colorPoly = [CIFilter filterWithName:@"CIColorPolynomial"];
    [colorPoly setDefaults];

    CIVector *redVector = [CIVector vectorWithX:aColor.redComponent Y:0 Z:0 W:0];
    CIVector *greenVector = [CIVector vectorWithX:aColor.greenComponent Y:0 Z:0 W:0];
    CIVector *blueVector = [CIVector vectorWithX:aColor.blueComponent Y:0 Z:0 W:0];
    [colorPoly setValue:redVector forKey:@"inputRedCoefficients"];
    [colorPoly setValue:greenVector forKey:@"inputGreenCoefficients"];
    [colorPoly setValue:blueVector forKey:@"inputBlueCoefficients"];
    [self setContentFilters:[NSArray arrayWithObjects:colorPoly, nil]];
}

@end