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Poll database on page visible

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I have a page which displays notifications from a database, the method to get the newest notifications gets called when a user logs in or uses the 'pull down to refresh' on the table, this is ok but i would like to change it call the method when the page is 'opened' or visible, I've tried calling it from ViewDidLoad, ViewWillAppear and ViewDidAppear but none of them seem to work, any ideas? the page is currently a DialogViewController placed within a SplitView.


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