+(UIColor*)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{    //删除字符串的空格    NSString *cString =[[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];        if ([cString  length] <6) {        return [UIColor  clearColor];    }    if ([cString hasPrefix:@"0X"]) {        cString = [cString  substringFromIndex:2];            }    if ([cString  hasPrefix:@"#"]) {        cString = [cString  substringFromIndex:1];    }    if ([cString  length] !=6) {        return [UIColor  clearColor];    }    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];    unsigned 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:alpha];        }+(UIColor*)colorWithHexString:(NSString *)color{        return [self  colorWithHexString:color alpha:1.0f];}