小编Sat*_*zal的帖子

我想仅显示列表视图生成器中的前十项，我该怎么做。

ListView.builder(
    itemCount: data == null ? 0 : data.length,
    itemBuilder: (BuildContext context, int index) {
      if (data[index]['population'] >= 100000) {
        return new Card(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              new Text(data[index]["name"]),
              new Text(data[index]["population"].toString()),
              new Text(data[index]["latlng"].toString()),
            ],
          ),
        );
      } else {
        return Container();
      }

我想让国家/地区代码选择textformfield()像前缀图标一样出现在里面。我怎么做？。这是我从intl_phone_number_input使用的代码。

InternationalPhoneNumberInput(
          onInputChanged: (PhoneNumber number) {
            print(number.phoneNumber);
          },
          onInputValidated: (bool value) {
            print(value);
          },
          selectorConfig: SelectorConfig(
            selectorType: PhoneInputSelectorType.BOTTOM_SHEET,
          ),
          ignoreBlank: false,
          autoValidateMode: AutovalidateMode.disabled,
          selectorTextStyle: TextStyle(color: Colors.black),
          initialValue: number,
          textFieldController: controller,
          formatInput: false,
          keyboardType:
              TextInputType.numberWithOptions(signed: true, decimal: true),
          inputBorder: OutlineInputBorder(),
          onSaved: (PhoneNumber number) {
            print('On Saved: $number');
          },
        ),