How to use Khmer word suggestions on iPhone
In an ordinary text field, switch to iBoard and start typing a Khmer word. Choose a completion when it matches the word you are writing. After selecting a word, iBoard may suggest what comes next. Use a prediction if it fits the sentence you meant to write. iBoard’s documented suggestion setup requires Allow Full Access.

Start in a draft you can reread
Open a blank note and switch to iBoard with the globe key. Pick a familiar word you know how to spell, such as សៀវភៅ. Decide what you want to write before checking the suggestions so you have something to compare them with.
Type the beginning of the word. If you see the word you intended, tap it and read the result in the note. If none fits, keep typing.
Tell a completion from a prediction
A completion is a candidate for the word you are still typing. Compare it with the spelling you had in mind. A next-word prediction is a candidate to follow a word you already chose. Read the two words together before accepting it.
In a reminder about a book, សៀវភៅ might complete the word you started. The next suggestion may not match what you wanted to say about it. You can keep the completed word and type the rest yourself.
Check Allow Full Access if you want suggestions
The released iBoard instructions require Allow Full Access for word suggestions. Find iBoard under Settings, then General, Keyboard and Keyboards. Review the permission on that screen before deciding whether to enable it.
Apple describes Full Access as expanding what a custom keyboard can do, including network access and sharing a container with its containing app. The permission applies to what a keyboard is allowed to do. If you prefer to keep it off, continue typing without relying on iBoard’s documented suggestions.
Check the sentence after selecting a word
Read the full sentence in the text field. If a suggestion changes your intended wording, correct it before sending. The app can adapt to selections over time, so use your own intended word as the check instead of relying on the same suggestion appearing every time.
Questions
Do I need to accept a next-word prediction?
No. Continue typing when the suggested word does not fit what you want to say.
Why did a different suggestion appear when I tried again?
iBoard can adapt to selections. The available suggestions also depend on the text you are typing, so check the word before choosing it.