Refactor toast window

ios/RNSimpleToast.mm

@@ -1,9 +1,9 @@
 #import "RNSimpleToast.h"
 
 #import "UIView+Toast.h"
-#import "RNToastViewController.h"
 #import <React/RCTConvert.h>
 #import "RNToastView.h"
+#import "RNToastWindow.h"
 
 static double defaultPositionId = 2.0;
 
@@ -106,18 +106,17 @@ - (void)_show:(NSString *)msg
 
     NSString *positionString = RNToastPositionMap[@(position)] ?: CSToastPositionBottom;
     dispatch_async(dispatch_get_main_queue(), ^{
-        RNToastViewController *controller = [RNToastViewController new];
-        [controller show];
+        UIWindow *window = [RNToastWindow new];
         BOOL kbdAvoidEnabled = [CSToastPositionBottom isEqualToString:positionString];
-        UIView *view = [[RNToastView alloc] initWithFrame:controller.toastWindow.bounds kbdHeight:self->_kbdHeight kbdAvoidEnabled:kbdAvoidEnabled];
-        [controller.toastWindow addSubview:view];
+        UIView *view = [[RNToastView alloc] initWithFrame:window.bounds kbdHeight:self->_kbdHeight kbdAvoidEnabled:kbdAvoidEnabled];
+        [window addSubview:view];
         UIView __weak *weakView = view;
 
         UIView *toast = [view toastViewForMessage:msg title:nil image:nil style:style];
 
         void (^completion)(BOOL) = ^(BOOL didTap) {
             [weakView removeFromSuperview];
-            [controller hide];
+            [window setHidden:YES];
         };
         // CSToastManager state is shared among toasts, and is used when toast is shown
         // so modifications to it should happen in the dispatch_get_main_queue block

ios/RNToastWindow.m

@@ -1,16 +1,29 @@
 #import "RNToastWindow.h"
+#import <React/RCTUtils.h>
 
 @implementation RNToastWindow
 
-- (instancetype)initWithFrame:(CGRect)frame {
-    if (self = [super initWithFrame:frame]) {
-        self.windowLevel = UIWindowLevelAlert + 1;
+- (instancetype)init
+{
+    if (@available(iOS 13.0, *)) {
+        for (UIScene *scene in RCTSharedApplication().connectedScenes) {
+            if (scene.activationState == UISceneActivationStateForegroundActive &&
+                [scene isKindOfClass:[UIWindowScene class]]) {
+                self = [super initWithWindowScene:(UIWindowScene *)scene];
+            }
+        }
     }
-    return self;
-}
-
-- (instancetype)initWithWindowScene:(UIWindowScene *)windowScene {
-    if (self = [super initWithWindowScene:windowScene]) {
+    if (!self) {
+        UIWindow *keyWindow = RCTSharedApplication().keyWindow;
+        if (keyWindow) {
+            self = [super initWithFrame:keyWindow.bounds];
+        } else {
+            // keyWindow is nil, so we cannot create and initialize _toastWindow
+            NSLog(@"Unable to create alert window: keyWindow is nil");
+        }
+    }
+    if (self) {
+        [self setHidden:NO];
         self.windowLevel = UIWindowLevelAlert + 1;
     }
     return self;
@@ -22,4 +35,11 @@ - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
   else return hitView;
 }
 
+- (void)dealloc
+{
+    if (@available(iOS 13, *)) {
+        self.windowScene = nil;
+    }
+}
+
 @end