FWAlertControllerDelegate

@protocol FWAlertControllerDelegate <NSObject>
@optional;
- (void)willPresentAlertController:(FWAlertController *)alertController; // 将要present
- (void)didPresentAlertController:(FWAlertController *)alertController;  // 已经present
- (void)willDismissAlertController:(FWAlertController *)alertController; // 将要dismiss
- (void)didDismissAlertController:(FWAlertController *)alertController;  // 已经dismiss
@end

Undocumented