Add some method

Demo/LCActionSheetDemo/ViewController.m

@@ -55,6 +55,12 @@ - (void)viewDidLoad {
         make.top.equalTo(self.view).offset(30.0 + ([[UIDevice currentDevice] lc_isX] ? 14.0 : 0));
         make.height.offset(44.0);
     }];
+
+    [NSTimer scheduledTimerWithTimeInterval:5 repeats:YES block:^(NSTimer * _Nonnull timer) {
+        printf("App's windows: %s\n", [[[UIApplication sharedApplication].windows description] cStringUsingEncoding:NSUTF8StringEncoding]);
+        printf("LCActionSheet isShowing: %d\n", (int)[LCActionSheet isShowing]);
+        printf("Showingsheet: %s\n", [[[LCActionSheet showingSheet] description] cStringUsingEncoding:NSUTF8StringEncoding]);
+    }];
 }
 
 - (void)viewWillAppear:(BOOL)animated {

Sources/LCActionSheet.h

@@ -215,6 +215,10 @@ typedef void(^LCActionSheetDidDismissHandler)(LCActionSheet *actionSheet, NSInte
  */
 @property (nonatomic, assign) BOOL autoHideWhenDeviceRotated;
 
+/**
+ The window, in which LCActionSheet is showing.
+ */
+@property (nullable, nonatomic, strong, readonly) UIWindow *window;
 
 /**
  LCActionSheet clicked handler.
@@ -458,6 +462,11 @@ typedef void(^LCActionSheetDidDismissHandler)(LCActionSheet *actionSheet, NSInte
  */
 - (void)show;
 
+/**
+ Hide the instance of LCActionSheet.
+ */
+- (void)hide;
+
 /**
  Get button title with index
 
@@ -466,6 +475,19 @@ typedef void(^LCActionSheetDidDismissHandler)(LCActionSheet *actionSheet, NSInte
  */
 - (NSString *)buttonTitleAtIndex:(NSInteger)index;
 
+/**
+ Is there an instance of LCActionSheet showing?
+ */
++ (BOOL)isShowing;
+
+/**
+ Get an instance of LCActionSheet, which is showing.
+ If there is no sheet showing, return nil.
+
+ @return An instance of LCActionSheet.
+ */
++ (instancetype)showingSheet;
+
 @end
 
 NS_ASSUME_NONNULL_END

Sources/LCActionSheet.m

@@ -51,8 +51,6 @@ @interface LCActionSheet () <UITableViewDataSource, UITableViewDelegate, UIScrol
 
 @property (nonatomic, weak) UIView *lineView;
 
-@property (nullable, nonatomic, strong) UIWindow *window;
-
 @end
 
 @implementation LCActionSheet
@@ -771,7 +769,7 @@ - (void)show {
     }
     window.rootViewController = viewController;
     [window makeKeyAndVisible];
-    self.window = window;
+    _window = window;
 
     [viewController.view addSubview:self];
     [self mas_makeConstraints:^(MASConstraintMaker *make) {
@@ -806,6 +804,10 @@ - (void)show {
     }];
 }
 
+- (void)hide {
+    [self hideWithButtonIndex:0];
+}
+
 - (void)hideWithButtonIndex:(NSInteger)buttonIndex {
     if ([self.delegate respondsToSelector:@selector(actionSheet:willDismissWithButtonIndex:)]) {
         [self.delegate actionSheet:self willDismissWithButtonIndex:buttonIndex];
@@ -836,7 +838,7 @@ - (void)hideWithButtonIndex:(NSInteger)buttonIndex {
 
         strongSelf.window.rootViewController = nil;
         strongSelf.window.hidden = YES;
-        strongSelf.window = nil;
+        _window = nil;
 
         if ([strongSelf.delegate respondsToSelector:@selector(actionSheet:didDismissWithButtonIndex:)]) {
             [strongSelf.delegate actionSheet:strongSelf didDismissWithButtonIndex:buttonIndex];
@@ -854,6 +856,46 @@ - (void)scrollViewDidScroll:(UIScrollView *)scrollView {
     }
 }
 
++ (UIWindow *)sheetWindow
+{
+    /**
+     [UIApplication sharedApplication].windows is empty, when applicationWillEnterForeground.
+     */
+    NSArray *array = [UIApplication sharedApplication].windows;
+    if (array.count > 0) {
+        for (int i = (int)array.count - 1; i >= 0; i--) {
+            UIWindow *window = [array objectAtIndex:i];
+            if ([window.rootViewController isKindOfClass:[LCActionSheetViewController class]]) {
+                return window;
+            }
+        }
+    } else {
+        UIWindow *window = [UIApplication sharedApplication].keyWindow;
+        if ([window.rootViewController isKindOfClass:[LCActionSheetViewController class]]) {
+            return window;
+        }
+    }
+
+    return nil;
+}
+
++ (BOOL)isShowing
+{
+    return ([LCActionSheet sheetWindow] != nil);
+}
+
++ (instancetype)showingSheet
+{
+    UIWindow *window = [LCActionSheet sheetWindow];
+    for (UIView *view in window.rootViewController.view.subviews) {
+        if ([view isKindOfClass:[LCActionSheet class]]) {
+            return (LCActionSheet *)view;
+        }
+    }
+
+    return nil;
+}
+
 #pragma mark - LCActionSheet & UITableView Delegate
 
 - (void)darkViewClicked {