16进制颜色(html颜色值)字符串转为UIColor

+ (UIColor *) colorWithHexString: (NSString *) stringToConvert

{

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

// String should be 6 or 8 characters

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

// strip 0X if it appears

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

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

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

// 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];

}

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