cgcolor

I'm trying to customize my button by changing their colors, but when I use either: self.loginButton.layer.backgroundColor = [UIColor colorWithRed:0.0 green:157.0/255.0 blue:223.0/255.0 alpha:1.0].CGColor; or self.loginButton.backgroundColor = [UIColor colorWithRed:0.0 green:157.0/255.0 blue:223.0/255.0 alpha:1.0]; All I get is this result: What I want to do is change the white color to blue, any idea what I'm doing wrong? You're using a round rect button which is pretty ugly, and pretty hard to customise. You can create a custom type button and use a background image, or create a custom type

Is there a Cocoa Touch way to convert colors from one color space to another? At the end of this code: UIColor *grey = [UIColor colorWithWhite: 0.5 alpha: 1.0]; CGColorRef greyRef = [grey CGColor]; int x = CGColorGetNumberOfComponents(greyRef); ... x is 2. The reason I need this is I'm trying to copy colors to a list of color components for CGGradientCreateWithColorComponents , which needs all colors in a single colorspace. The problem is that grey is in the grayscale colorspace, rather than the RGB one. (The name escapes me at the moment, but it isn't important.) CGGradientRef createGradient

I have a condition in my app where user can choose 3 colors, but those colors should not match with each other, the problem is user can choose the similar color from the pallet for all 3 fields. I'm trying below code, here color2 has slightly different value of 'green' than color1 :- UIColor *color1 = [UIColor colorWithRed:1 green:(CGFloat)0.4 blue:1 alpha:1]; UIColor *color2 = [UIColor colorWithRed:1 green:(CGFloat)0.2 blue:1 alpha:1]; if ([color1 isEqual:color2]) { NSLog(@"equals"); }else { NSLog(@"not equal"); } output: 'not equal' This is correct by logic because it compares RGB value but

This question already has an answer here: How to get RGB values from UIColor? 14 answers Seen this asked before but my example does not seem to work. const CGFloat *toCol = CGColorGetComponents([[UIColor greenColor] CGColor]); The array is empty from looking at it with GDB. Any hints? The code sample you provided should work. Try this: UIColor uicolor = [[UIColor greenColor] retain]; CGColorRef color = [uicolor CGColor]; int numComponents = CGColorGetNumberOfComponents(color); if (numComponents == 4) { const CGFloat *components = CGColorGetComponents(color); CGFloat red = components[0];