Help getting through the 2nd page of “Learn to code 1” in Swift playgrounds?

Hi my friend!
Please code any simple text editor for us, blind users!
The task:
You should place on the form three items:
1. on the top left corner "open" button;
2. on the right top corner "save" button;
3. The remained part of this form has to be placed with multi line text edit item;
4. on click "open" button you should code the event which is opening a standard dialogue for choosing file;
For this purpose use Universal type identifier (reference by apple). In our case use 'public.text';
5. When you will get the path of the chosen file, show the file name in the title of this form;
6. Let the user be typing text;
7. on click "save" button you should code the event which is opening a standard dialogue for choosing file;
You have copy text from the multiline text edit item and place it into the file;
8. In the title of this form you should show the file name and the word "Saved";
9. Then compile your app and locate it on app store.
10. Give us your link;
11. It will be your first accessible app.
Cheers!