String firstName = '';
TextEditingController fnameEditController = TextEditingController(text:firstName);
嘗試向 TextEditingController(text:firstName) 添加字串時出現錯誤：
The instance member 'firstName' can't be accessed in an initializer.
Try replacing the reference to the instance member with a different expressiondartimplicit_this_reference_in_initializer
String firstName
uj5u.com熱心網友回復：
當然不行。。
嘗試在 initState 中這樣做
String firstName = '';
late TextEditingController _controller;
@override
initState() {
// this will work
_controller = TextEditingController(text: firstName);
}
uj5u.com熱心網友回復：
好吧，你不能，因為這個 'firstName' 不是一個常量變數。您可以通過創建常量變數來分配它，例如
static const String firstName = '';
TextEditingController fnameEditController =
TextEditingController(text: firstName);
另外，正如@emanuel sanga 所回答的那樣，您可以使用 initState
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