switch to disable accessibility support.

ios/Classes/Adaptor/FLBFlutterEngine.m

@@ -84,6 +84,11 @@
     [[_engine lifecycleChannel] sendMessage:@"AppLifecycleState.inactive"];
 }
 
+- (void)setAccessibilityEnabled:(BOOL)enable
+{
+    self.viewController.accessibilityEnable = enable;
+}
+
 @end
 
 #endif

ios/Classes/Adaptor/FLBFlutterEngineOld.m

@@ -85,4 +85,9 @@
     [self.viewController sendOnChannel:channel message:data];
 }
 
+- (void)setAccessibilityEnabled:(BOOL)enable
+{
+    self.viewController.accessibilityEnable = enable;
+}
+
 @end

ios/Classes/Adaptor/FLBFlutterViewControllerAdaptor.h

@@ -31,6 +31,9 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)boost_viewDidAppear:(BOOL)animated;
 - (void)boost_viewWillDisappear:(BOOL)animated;
 - (void)boost_viewDidDisappear:(BOOL)animated;
+
+@property (nonatomic,assign) BOOL accessibilityEnable;
+
 @end
 
 NS_ASSUME_NONNULL_END

ios/Classes/Adaptor/FLBFlutterViewControllerAdaptor.m

@@ -23,6 +23,7 @@
  */
 
 #import "FLBFlutterViewControllerAdaptor.h"
+#import <objc/runtime.h>
 
 @interface FLBFlutterViewControllerAdaptor ()
 @end
@@ -32,6 +33,15 @@
 - (void)viewDidLoad {
     [super viewDidLoad];
     
+    Class class = [self class];
+    
+    SEL originalSelector = @selector(onAccessibilityStatusChanged:);
+    SEL swizzledSelector = @selector(fixed_onAccessibilityStatusChanged:);
+    
+    Method originalMethod = class_getInstanceMethod(class, originalSelector);
+    Method swizzledMethod = class_getInstanceMethod(class, swizzledSelector);
+    method_exchangeImplementations(originalMethod, swizzledMethod);
+
     self.view.backgroundColor = [UIColor whiteColor];
     
     // Do any additional setup after loading the view.
@@ -96,4 +106,11 @@
   //Override this to avoid unnecessary splash Screen.
 }
 
+- (void)fixed_onAccessibilityStatusChanged:(NSNotification*)notification {
+    if(self.accessibilityEnable){
+        [self fixed_onAccessibilityStatusChanged:notification];
+    }
+}
+
+
 @end

ios/Classes/Adaptor/FLBFlutterViewProvider.h

@@ -33,6 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
 @protocol FLBFlutterViewProvider <NSObject>
 
 @required
+- (void)setAccessibilityEnable:(BOOL)enable;
 - (FlutterViewController *)viewController;
 - (void)pause;
 - (void)resume;

ios/Classes/Boost/FLBFlutterApplication.h

@@ -33,6 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic,strong) id<FLBPlatform> platform;
 
 #pragma mark - Getters
+- (void)setAccessibilityEnable:(BOOL)enable;
 + (FLBFlutterApplication *)sharedApplication;
 - (void)startFlutterWithPlatform:(id<FLBPlatform>)platform
                          onStart:(void (^)(FlutterViewController *))callback;

ios/Classes/Boost/FLBFlutterApplication.m

@@ -142,6 +142,10 @@
     [self.viewProvider inactive];
 }
 
+- (void)setAccessibilityEnable:(BOOL)enable
+{
+    [self.viewProvider setAccessibilityEnable:enable];
+}
 
 
 @end

ios/Classes/Boost/FlutterBoostPlugin.h

@@ -31,6 +31,8 @@ typedef FLBFlutterViewContainer * (^FLBPageBuilder)(NSString *name,NSDictionary
 @interface FlutterBoostPlugin : NSObject<FlutterPlugin>
 #pragma mark - Initializer
 
+- (void)setAccessibilityEnable:(BOOL)enable;
+
 + (instancetype)sharedInstance;
 
 - (void)startFlutterWithPlatform:(id<FLBPlatform>)platform onStart:(void (^)(FlutterViewController *))callback;

ios/Classes/Boost/FlutterBoostPlugin.m

@@ -101,4 +101,9 @@
     [_resultMediator removeHandlerForKey:vcid];
 }
 
+- (void)setAccessibilityEnable:(BOOL)enable
+{
+    [[FLBFlutterApplication sharedApplication] setAccessibilityEnable:enable];
+}
+
 @end