flutter inputdecoration border
To add a border to an InputDecoration in Flutter, you can use the "border" property of the InputDecoration class. Here's an example of how you can do this:
```dart
TextField(
  decoration: InputDecoration(
    border: OutlineInputBorder(
      borderSide: BorderSide(
        color: , // set border color here
        width: 1.0, // set border width here
      ),
border radius什么意思
      borderRadius: BorderRadius.all(
        Radius.circular(5.0), // set border radius here
      ),
    ),
  ),
),
```
In this example, the border color is set to grey, the border width is set to 1.0, and the border radius is set to 5.0. You can customize these values to achieve the desired border style.

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