HEX to UIColorfromRGB - iphone

Question

I'm following a tutorial here
It's fairly straight forward and simple, only 2 steps. But on the last step, I have the HEX code in a UITextField as hexText.text, but how do i put that into UIColorFromRGB?

Answer 1

here is a solution that avoids the macro stuff. You can add it to a category to UIColor and use it more nicely.

Answer 2

Sorin has the right idea here I think. Much more cocoa-like, and will result in fewer headaches. To answer your question at a high level, you'd need to convert your string to a hexadecimal number, and then pass that resulting value in to the macro. I think you'd be better served just passing the string value into the category listed in Sorin's link.

Answer 3

This will solve any case
+ (UIColor *) colorWithHexString: (NSString *) stringToConvert{
NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
unsigned int r, g, b,alpha = 1;
NSRange range;
range.location = 0;
range.length = 2;
// String should be 6 or 8 characters
if ([cString length] < 6) return [UIColor blackColor];
// strip 0X if it appears
if ([cString hasPrefix:#"0X"]) cString = [cString substringFromIndex:2];
if ([cString hasPrefix:#"#"]) cString = [cString substringFromIndex:1];
if ([cString length] == 8) {
[[NSScanner scannerWithString:[cString substringWithRange:range]] scanHexInt:&alpha];
cString = [cString substringFromIndex:2];
}
if ([cString length] != 6) return [UIColor blackColor];
// Separate into r, g, b substrings
NSString *rString = [cString substringWithRange:range];
range.location = 2;
NSString *gString = [cString substringWithRange:range];
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f)
green:((float) g / 255.0f)
blue:((float) b / 255.0f)
alpha:((float) alpha / 255.0f)];
}