IOS中十六进制的颜色转换为UIColor详解手机开发

 
 
    #pragma mark - 颜色转换 IOS中十六进制的颜色转换为UIColor   
    + (UIColor *) colorWithHexString: (NSString *)color   
    {   
        NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];   
           
        // String should be 6 or 8 characters   
        if ([cString length] < 6) {   
            return [UIColor clearColor];   
        }   
           
        // 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 [UIColor clearColor];   
           
        // Separate into r, g, b substrings   
        NSRange range;   
        range.location = 0;   
        range.length = 2;   
           
        //r   
        NSString *rString = [cString substringWithRange:range];   
           
        //g   
        range.location = 2;   
        NSString *gString = [cString substringWithRange:range];   
           
        //b   
        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];   
    }