AutoCompleteTextView for Xamarin.iOS: Suggest Modes
There are three suggesting modes in which TKAutoCompleteTextView operates:
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TKAutoCompleteSuggestModeAppend- suggestions are shown in list view.

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TKAutoCompleteSuggestModeSuggest- only one suggestion is shown as an instant completion to the typed text.

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TKAutoCompleteSuggestModeSuggestAppend- combines the first two modes.

The default suggesting mode is TKAutoCompleteSuggestMode.Suggest. It can be changed through the SuggestMode property of the TKAutoCompleteTextView:
this.Autocomplete.SuggestMode = TKAutoCompleteSuggestMode.Suggest;