Flutter 中 TextFormField 的 prefixIcon 的调整大小（高度和宽度）不起作用

Question

final password = TextFormField(
  autofocus: false,
  obscureText: true,
  decoration: InputDecoration(
    hintText: 'Password',
    contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
    prefixIcon: new ImageIcon(
      new AssetImage('assets/ic_email.png'),
      size: 15.0,
    ),
  ),
);

我已将大小设置为 15.0，但没有任何变化，所以请指导我，我哪里做错了？

Answer 1

刚刚通过在Image.asset中设置属性得到解决方案，请尝试以下方法

final password = TextFormField(
  autofocus: false,
  obscureText: true,
  decoration: InputDecoration(
    hintText: 'Password',
    contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
    prefixIcon: new IconButton(
      icon: new Image.asset('assets/ic_email.png',width: 15.0,height: 15.0,),
      onPressed: null,
    ),
  ),
);

Answer 2

你可以这样做

TextField(
              textCapitalization: TextCapitalization.sentences,
              keyboardType: TextInputType.text,
              textInputAction: TextInputAction.next,

              decoration: InputDecoration(
                border: InputBorder.none,
                focusedBorder: InputBorder.none,
                prefixIcon: IconButton(
                  icon: Image.asset(
                    'assets/your_image_here',),
                  onPressed: () {},
                ),

                enabledBorder: InputBorder.none,
                errorBorder: InputBorder.none,
                hintText: AppString.searchName,
              ),

            )

Flutter 中 TextFormField 的 prefixIcon 的调整大小（高度和宽度）不起作用

Resize (height and width) of an prefixIcon of TextFormField in Flutter is not working

flutter

flutter-layout