flutter keyboard does not close - flutter

I developed an application with Flutter, but I have 1 problem when I test it on real devices, the keyboard does not turn off! I press the back button, it closes and reopens

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When the app is turned off or switched, the keyboard becomes stuck or disappears

When I open a keyboard and then move my app to recent apps or switch, when I return, there is no keyboard on my screen but it occupies the area of the keyboard and appears a white area, and then the keyboard does not open and neither that portion goes until I remove that app and then reopen it. It is especially noticeable on iOS; the same project works perfectly on Android.
My project is in Flutter, and I am using GetX for state management.
The link to the video of the error is given below.
https://drive.google.com/file/d/1NcQGIdHkTRopWM3M33vM4XvKmyC59zHn/view?usp=share_link
I try adding "life cycle" and then adding these lines, but nothing happens.
FocusManager.instance.primaryFocus?.unfocus();
SystemChannels.textInput.invokeMethod('TextInput.hide');

Flutter Hide Soft Keyboard Entire Project

We are creating an application for PDA device. it is a barcode scanner device with inbuild keyboard. So, I need to hide the soft keyboard on this project.

I have a problem with my UITextField simulator keyboard which would not pop up again for any user input once I run the app

when I ran my Xcode and went to type "Vatican City" in it , I typed Vatican using simulator keyboard and mistakingly typed City with my laptop keyboard.
once I pressed my laptop key , the simulator keyboard disappeared from the screen.
Now whenever I run my app and press on the UITextField, I do not get my simulator keyboard to pop up to take user input but it take input via my laptop keyboard
The properties in the attributes pane have been the same and nothing has been changed manually by me for my simulator to function like this. what should I do to get the simulator keyboard to pop up again when I want to give some user input?
enter image description here
Try enabling your software keyboard:
Shortcut keys: Cmd+Shift+K

Shut down iPhone in simulator

This might seem like a strange question, but can I actually shut down the iPhone and restart it in the iPhone simulator? I want to do this to see if my settings are saved and reloaded when the app is relaunched AFTER shutdown.
Thanks
Yes. Press Command+Q to quit the simulator.
This will close all the apps running in the simulator.
Pressing the home button only returns to the home screen without quitting the apps(ios 4 or later) because of multitasking.
You can also double tap the home button, click and hold on the icons at the bottom of the screen till a red circle appear, and click on the red circle to close the running app.
As of XCode 9, the best way to close a single simulator is using the Cmd + W shortcut, or going to File -> Close Window.
If your'e xcode 9.You can now shutdown the simulator by long-pressing the power button.
To close/shutdown one simulated device without closing other simulations, select the device you want to shut down then go to "File" and choose "Close Window".

How to exit an app in iphone

Now i have to click the Home button twice and press one app until the close button appear, so many steps. Is there any quick way to exit currently opened app?
You can't with the current SDK.