didChangeMetrics method
void
didChangeMetrics()
当键盘高度变化时执行
Implementation
void didChangeMetrics(){
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
final height = MediaQuery.of(context).viewInsets.bottom;
ref.read(myKeyBoardHeight.notifier).state = height;
if(height == 0.0){
onClose();
}else{
onShow(height);
}
});
}