Comments on: Using NSScanner to convert Hex to RGB Color http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html iOS and Objective-C Tips, Tricks and Tutorials. Sat, 19 May 2012 05:15:17 -0500 hourly 1 http://wordpress.org/?v=3.3.2 By: Hcan http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-56637 Hcan Tue, 26 Jul 2011 09:17:31 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-56637 Thanks for sharing this. Its a nice compact way of doing the stuff Thanks for sharing this. Its a nice compact way of doing the stuff

]]> By: Hcan http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-56636 Hcan Tue, 26 Jul 2011 09:16:28 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-56636 Thanks, this is very useful. Thanks, this is very useful.

]]> By: Jonas Schnelli http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-18494 Jonas Schnelli Thu, 01 Jul 2010 20:12:27 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-18494 Here's an open source UIColor category / extension to make hex color creation from NSString possible: http://github.com/jonasschnelli/UIColor-i7HexColor Here’s an open source UIColor category / extension to make hex color creation from NSString possible:
http://github.com/jonasschnelli/UIColor-i7HexColor

]]> By: Kevin http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-5172 Kevin Wed, 23 Sep 2009 05:17:22 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-5172 This is my technique: #define HEXCOLOR(c) [UIColor colorWithRed:((c)&0xFF)/255.0 \ green:((c>>8)&0xFF)/255.0 \ blue:((c>>16)&0xFF)/255.0 \ alpha:((c>>24)&0xFF)/255.0] unsigned int colorValue; [[NSScanner scannerWithString:colorString] scanHexInt:&colorValue]; UIColor *color = HEXCOLOR(colorValue); A sample hex color string "7fcf0064" that should come out as light purple. "64" is red and "7f" is alpha. This is my technique:

#define HEXCOLOR(c) [UIColor colorWithRed:((c)&0xFF)/255.0 \
green:((c>>8)&0xFF)/255.0 \
blue:((c>>16)&0xFF)/255.0 \
alpha:((c>>24)&0xFF)/255.0]
unsigned int colorValue;
[[NSScanner scannerWithString:colorString] scanHexInt:&colorValue];
UIColor *color = HEXCOLOR(colorValue);

A sample hex color string “7fcf0064″ that should come out as light purple. “64″ is red and “7f” is alpha.

]]> By: Nick http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-3668 Nick Wed, 01 Jul 2009 00:12:01 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-3668 This is good. Should you want something even more complex have a look at this: http://paste.lisp.org/display/74985 This is good. Should you want something even more complex have a look at this: http://paste.lisp.org/display/74985

]]> By: Ed http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-2374 Ed Mon, 25 May 2009 03:33:11 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-2374 Thank you. This was useful and well presented. Thank you. This was useful and well presented.

]]> By: AJS http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-275 AJS Thu, 05 Mar 2009 17:09:53 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-275 Ok, so I should have finished coding before replying here. It seems that the iPhone doesn't support sRGB when going via CGColor: kCGColorSpaceSRGB is unavailable. Ok, so I should have finished coding before replying here. It seems that the iPhone doesn’t support sRGB when going via CGColor: kCGColorSpaceSRGB is unavailable.

]]> By: AJS http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-274 AJS Thu, 05 Mar 2009 16:24:26 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-274 Also note that the UIColor convenience constructor used above interprets the RGBA values in the device colorspace. This differs from the hex strings in CSS which are in sRGB. To use sRGB it looks like one has to go via CGColor. Also note that the UIColor convenience constructor used above interprets the RGBA values in the device colorspace. This differs from the hex strings in CSS which are in sRGB.

To use sRGB it looks like one has to go via CGColor.

]]> By: Rodney Aiglstorfer http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-270 Rodney Aiglstorfer Sun, 01 Mar 2009 20:19:16 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-270 @Joao Prado Maia Thanks for that tip ... it is much more concise. Unfortunately it doesn't deal with the issue that I was solving. In my case, the hex value was stored in a text file as a string. This file was something that was created by an entirely different application (thus no control over format). Given that the rgbvalue was a string, NSScanner made the most sense. All that said, I will definitely use your approach if I have a hex value in an integer value. @Joao Prado Maia

Thanks for that tip … it is much more concise. Unfortunately it doesn’t deal with the issue that I was solving. In my case, the hex value was stored in a text file as a string. This file was something that was created by an entirely different application (thus no control over format). Given that the rgbvalue was a string, NSScanner made the most sense. All that said, I will definitely use your approach if I have a hex value in an integer value.

]]> By: Ivan http://MobileDeveloperTips.com/general/using-nsscanner-to-convert-hex-to-rgb-color.html#comment-268 Ivan Sun, 01 Mar 2009 14:53:23 +0000 http://iPhoneDeveloperTips.com/?p=1604#comment-268 Rodney, Thanks, this is very helpful. Cheers, Ivan Rodney,

Thanks, this is very helpful.

Cheers,
Ivan

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