objective c - How to update widget UI on data change iOS 8 Today Extension -

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i need confirm these things

  1. does widgetperformupdatewithcompletionhandler called notification center self or manually call in way?
  2. if don't have widgetperformupdatewithcompletionhandler control how can update data on data change (i using service fetch json feeds url)

here have noticed.

  1. widgetperformupdatewithcompletionhandler called once when widget loaded.
  2. viewwillappear/didappear called on switching between today , notification.

though have read tutorials , other stuffs specific point unable understand. haven't pasted code here it's more of conceptual thing.

kindly share knowledge ncwidgetproviding delegates.

updated: enable widget update view when it’s off-screen make following changes widgetperformupdatewithcompletionhandler. the system takes snapshot of widget , periodically, try update it. if updates successfully, function calls system-provided completion block ncupdateresult.newdata enumeration. if update wasn’t successful, existing snapshot used.


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