onChang method
Implementation
void onChang(int index) {
if (widget.onChang is Function) {
widget.onChang!(index);
}
setState(() {
_index = index;
});
}
void onChang(int index) {
if (widget.onChang is Function) {
widget.onChang!(index);
}
setState(() {
_index = index;
});
}