Question

您好我想使用HTML颜色代码动态显示UITableviewcells背景颜色。我的要求是使用json数组并获取HTML Color代码。并使用颜色代码如何转换rgb值。任何身体帮助我。这是我的json回复。

[{"classified_id":83,color_code":"#990066}

{"classified_id":82 "color_code":"#ff66cc”}

{"classified_id":80  color_code":"#990066”}

{"classified_id":78  "color_code":"#ff6633”}

{“classified_id":77   "color_code":"#ff6633”}

Answer 1

您的问题实际上应该如何将十六进制颜色代码转换为UIColor 吧？

在imports

之后在班级上创建此宏

#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]

然后你可以得到这样的颜色：

- (UIColor *)colorFromHex:(NSString *)strcolor
{
    NSScanner *scanner = [NSScanner scannerWithString:[strcolor stringByReplacingOccurrencesOfString:@"#" withString:@""]];
    unsigned hex;
    BOOL success = [scanner scanHexInt:&hex];
    return UIColorFromRGB(hex);
}

希望你想要的东西。

[self.view setBackgroundColor:[self colorFromHex:@"#FF0000"]];

Answer 2

尝试这个

  #define UIColorFromRGBWithAlpha(rgbValue,a) [UIColor \
    colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \
    green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \
    blue:((float)(rgbValue & 0xFF))/255.0 alpha:a]

UIColorFromRGBWithAlpha(0xff6633,1)

您可以在班级中添加方法并将十六进制转换为颜色

-(UIColor *)getUIColorObjectFromHexString:(NSString *)hexStr alpha:(CGFloat)alpha{

    unsigned int hexint = [CommonMethods intFromHexString:hexStr];
    UIColor *color =
    [UIColor colorWithRed:((CGFloat) ((hexint & 0xFF0000) >> 16))/255
                    green:((CGFloat) ((hexint & 0xFF00) >> 8))/255
                     blue:((CGFloat) (hexint & 0xFF))/255
                    alpha:alpha];

    return color;
}
-(unsigned int)intFromHexString:(NSString *)hexStr{

    unsigned int hexInt = 0;
    NSScanner *scanner = [NSScanner scannerWithString:hexStr];
    [scanner setCharactersToBeSkipped:[NSCharacterSet characterSetWithCharactersInString:@"#"]];
    [scanner scanHexInt:&hexInt];
    return hexInt;
}

Answer 3

您可以使用convenient category to extend UIColor执行此操作。具体来说，您应该使用colorWithHexString:类方法初始化带有十六进制值的UIColor。

Answer 4

您可以添加UIColor类别并添加此方法 -

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

    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];
}

如何在UITableviewcells中显示HTML颜色代码

4 个答案: