improve keyboard hide detection

client/SDL_uikit_main.mm

@@ -147,7 +147,7 @@ main(int argc, char *argv[])
         [NSNotificationCenter.defaultCenter addObserverForName:UIWindowDidBecomeKeyNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
             [UIApplication.sharedApplication.keyWindow.rootViewController addObserver:observer forKeyPath:NSStringFromSelector(@selector(view)) options:NSKeyValueObservingOptionNew context:NULL];
         }];
-        [NSNotificationCenter.defaultCenter addObserverForName:UIKeyboardDidHideNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
+        [NSNotificationCenter.defaultCenter addObserverForName:UITextFieldTextDidEndEditingNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
             removeFocusFromActiveInput();
         }];
         return SDL_UIKitRunApp(argc, argv, SDL_main);