updateThirdIndex method
更新第三列index
Implementation
@override
void updateThirdIndex(int index) {
super.updateThirdIndex(index);
int minSecond = _minSecondOfCurrentMinute();
DateTime dateTime = currentTime.isUtc ? DateTime.utc(0) : DateTime(0);
currentTime = dateTime.add(Duration(
hours: currentTime.hour,
minutes: currentTime.minute,
seconds: minSecond + index,
));
}