As of now I would like to opt out of the new option iOS 11 gives, that is to suggest passwords in the app. When I run the app on iOS 11 I get the autofill option on top of t
Autofill is by default enabled for users. iOS saves all passwords in the keychain and make them available in keyboard in your apps. UITextView and UITextField automatically considered for AutoFill password. you can disable by specifying a content type that is neither username nor password but if the content type info already stored in keychain it will show in the quick bar. so better to assign empty UITextContentType type and it will not show quickbar.
Example:
if #available(iOS 10.0, *) {
self.textField.textContentType = UITextContentType("")
} else {
// Fallback on earlier versions
}