how to set hex color code for background [duplicate]

Question

Possible Duplicate:
How can I create a UIColor from a hex string?

I want to programmatically set the color of the UIView Background.

It doesn't seem like I can do it through Interfacebuilder. How should I do it if I want to set it to some hex code color?

Answer 1

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];   }  

Answer 2

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.