setOnSettings method
Sets the callback function for user selecting the "settings" option in ending widget.
The onSettings() event is triggered when the user selects "settings" in the ending screen. If a callback function is not registered, the SDK defaults to calling the TikiSdk.settings() method.
Implementation
TikiSdk setOnSettings(Function(Offer) onSettings) {
_onSettings = onSettings;
return this;
}