V 3.2.0

• 思来想去，还是恢复了“黑”状态栏的样式。现在 LCActionSheet 实例将会在调用 show 方法时，新建一个 UIWindow 实例并 makeKeyAndVisible，然后把 LCActionSheet 实例添加到该 UIWindow 实例之上。之前的逻辑是直接把 LCActionSheet 实例添加到 AppDelegate 的 keyWindow 上面。显然的，现在状态栏将被会灰色背景一块“黑”掉。

• 新增下列方法，didDismiss 回调能很方便地满足在 LCActionSheet hide 时，需要在原 keyWindow 上操作的需求：

  @interface LCActionSheet : UIView
  
  // Initialize an instance of LCActionSheet (Block).
  + (instancetype)sheetWithTitle:(nullable NSString *)title
               cancelButtonTitle:(nullable NSString *)cancelButtonTitle
                      didDismiss:(nullable LCActionSheetDidDismissHandler)didDismissHandler
               otherButtonTitles:(nullable NSString *)otherButtonTitles, ... NS_REQUIRES_NIL_TERMINATION;
  
  // Initialize an instance of LCActionSheet with title array (Block).
  + (instancetype)sheetWithTitle:(nullable NSString *)title
               cancelButtonTitle:(nullable NSString *)cancelButtonTitle
                      didDismiss:(nullable LCActionSheetDidDismissHandler)didDismissHandler
           otherButtonTitleArray:(nullable NSArray<NSString *> *)otherButtonTitleArray;
  
  // Initialize an instance of LCActionSheet (Block).
  - (instancetype)initWithTitle:(nullable NSString *)title
              cancelButtonTitle:(nullable NSString *)cancelButtonTitle
                     didDismiss:(nullable LCActionSheetDidDismissHandler)didDismissHandler
              otherButtonTitles:(nullable NSString *)otherButtonTitles, ... NS_REQUIRES_NIL_TERMINATION;
  
  // Initialize an instance of LCActionSheet with title array (Block).
  - (instancetype)initWithTitle:(nullable NSString *)title
              cancelButtonTitle:(nullable NSString *)cancelButtonTitle
                     didDismiss:(nullable LCActionSheetDidDismissHandler)didDismissHandler
          otherButtonTitleArray:(nullable NSArray<NSString *> *)otherButtonTitleArray;
  
  @end