在Flutter中,可以使用输入格式化程序将用户的输入文本格式化为MM/DD/YYYY的日期格式。以下是一种实现方式:
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
TextEditingController _controller = TextEditingController();
TextField(
controller: _controller,
inputFormatters: [
FilteringTextInputFormatter.digitsOnly,
_DateInputFormatter(),
],
)
class _DateInputFormatter extends TextInputFormatter {
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
final int newTextLength = newValue.text.length;
int selectionIndex = newValue.selection.end;
int usedSubstringIndex = 0;
final StringBuffer newText = StringBuffer();
if (newTextLength >= 1) {
newText.write(newValue.text.substring(0, usedSubstringIndex = 1) + '/');
if (newValue.selection.end >= 1) selectionIndex++;
}
if (newTextLength >= 3) {
newText.write(newValue.text.substring(1, usedSubstringIndex = 3) + '/');
if (newValue.selection.end >= 3) selectionIndex++;
}
if (newTextLength >= 5) {
newText.write(newValue.text.substring(3, usedSubstringIndex = 5));
if (newValue.selection.end >= 5) selectionIndex++;
}
// If the old value had selection, the new value should have the same selection.
// Because we've inserted/changed some characters, we need to update the selection position.
selectionIndex = math.min(selectionIndex, newText.length);
selectionIndex = math.max(selectionIndex, 0);
return TextEditingValue(
text: newText.toString(),
selection: TextSelection.collapsed(offset: selectionIndex),
);
}
}
这个自定义的输入格式化程序将确保用户在输入时按照MM/DD/YYYY的格式进行输入。它会自动在用户输入的第2个和第5个字符后插入斜杠,并且会根据用户的输入位置调整光标位置。
这是一个基本的示例,你可以根据自己的需求进行修改和扩展。希望对你有帮助!
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