需求
監(jiān)聽輸入框的獲取，失去焦點(diǎn)事件
實(shí)現(xiàn)
FocusNode可以實(shí)現(xiàn)對(duì)TextField的焦點(diǎn)事件的監(jiān)聽朴沿，通過向addListener方法傳入回調(diào)函數(shù)來實(shí)現(xiàn)對(duì)TextField獲取或者失去焦點(diǎn)的監(jiān)聽。
focus_event.gif
代碼片段
FocusNode _focusNode = FocusNode();
@override
void initState() {
_focusNode.addListener(() {
if (!_focusNode.hasFocus) {
// TextField has lost focus
_showMessage();
}
});
super.initState();
}
源碼
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