颜色转换到16进制

#import <UIKit/UIKit.h>

@interface UIColor (Addition)

+ (UIColor *)getColorWithHexString:(NSString *)hexColorStr;

@end

#import "UIColor+Addition.h"

@implementation UIColor (Addition)

#pragma mark -- 颜色转换

+ (UIColor *)getColorWithHexString:(NSString *)hexColorStr

{

    NSString *cString = [[hexColorStr stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    // String should be 6 or 8 characters

    if ([cString length] < 6) return nil;

    // strip 0X if it appears

    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];

    if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];

    if ([cString length] != 6) return nil;

    // 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];

}

@end

颜色转换到16进制

原文：http://www.cnblogs.com/dcy123/p/5328968.html