how to set hex color code for background [duplicate]

I like to use this little piece of code to use HTML web colors in my apps.

Usage:

[self.view setBackgroundColor: [self colorWithHexString:@"FFFFFF"]]; /* white */

The Code:

-(UIColor*)colorWithHexString:(NSString*)hex  {      NSString *cString = [[hex stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];      // String should be 6 or 8 characters      if ([cString length] < 6) return [UIColor grayColor];      // strip 0X if it appears      if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];      if ([cString length] != 6) return  [UIColor grayColor];      // Separate into r, g, b substrings      NSRange range;      range.location = 0;      range.length = 2;      NSString *rString = [cString substringWithRange:range];      range.location = 2;      NSString *gString = [cString substringWithRange:range];      range.location = 4;      NSString *bString = [cString substringWithRange:range];      // Scan values      unsigned int r, g, b;      [[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:1.0f];  } 

Here's simple category on UIColor that helps you create color from 8bit int value
and from hex value ("#a2ffc0").

UIColor+CreateMethods.h

////  UIColor+CreateMethods.h////  Created by Tomasz Rybakiewicz on 1/13/12.//#import <UIKit/UIKit.h>@interface UIColor (CreateMethods)// wrapper for [UIColor colorWithRed:green:blue:alpha:]// values must be in range 0 - 255+ (UIColor*)colorWith8BitRed:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue alpha:(CGFloat)alpha;// Creates color using hex representation// hex - must be in format: #FF00CC // alpha - must be in range 0.0 - 1.0+ (UIColor*)colorWithHex:(NSString*)hex alpha:(CGFloat)alpha;@end

UIColor+CreateMethods.m

////  UIColor+CreateMethods.m////  Created by Tomasz Rybakiewicz on 1/13/12.//#import "UIColor+CreateMethods.h"@implementation UIColor (CreateMethods)+ (UIColor*)colorWith8BitRed:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue alpha:(CGFloat)alpha {    return [UIColor colorWithRed:(red/255.0) green:(green/255.0) blue:(blue/255.0) alpha:alpha];}+ (UIColor*)colorWithHex:(NSString*)hex alpha:(CGFloat)alpha {    assert(7 == [hex length]);    assert('#' == [hex characterAtIndex:0]);    NSString *redHex = [NSString stringWithFormat:@"0x%@", [hex substringWithRange:NSMakeRange(1, 2)]];    NSString *greenHex = [NSString stringWithFormat:@"0x%@", [hex substringWithRange:NSMakeRange(3, 2)]];    NSString *blueHex = [NSString stringWithFormat:@"0x%@", [hex substringWithRange:NSMakeRange(5, 2)]];    unsigned redInt = 0;    NSScanner *rScanner = [NSScanner scannerWithString:redHex];    [rScanner scanHexInt:&redInt];    unsigned greenInt = 0;    NSScanner *gScanner = [NSScanner scannerWithString:greenHex];    [gScanner scanHexInt:&greenInt];    unsigned blueInt = 0;    NSScanner *bScanner = [NSScanner scannerWithString:blueHex];    [bScanner scanHexInt:&blueInt];    return [UIColor colorWith8BitRed:redInt green:greenInt blue:blueInt alpha:alpha];}@end

Enjoy.

UIView's setBackgroundColor method. You can create a UIColor from hex with UIColor initWithRed:green:blue:alpha it takes floats so you'll need to do bitshifts and math to get the appropriate components. This is how I manage it