OnShowLoading typedef

OnShowLoading = void Function(String? loadingTxt, Color barrierColor, bool barrierDismissible, bool cancelable)

展示loading的回调方法，主要是把UI操作赚到widget上

Implementation

typedef OnShowLoading = void Function(String? loadingTxt, Color barrierColor,
    bool barrierDismissible, bool cancelable);