UISeachBar and keyboard appearing, disappearing, and then appearing again

I have a UISearchBar which can become first responder. In the same screen I have a tableview whose rows the user can touch to go to a new screen. Howeve开发者_如何学Gor, when the search bar is active and the keyboard is up, if the user touches one of the table rows to go to a new screen and then goes back, the keyboard reappears, disappears, and then appears again one last time. Any ideas what's causing this?

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It seems you are popping view controller back after pushing. See if there is this line

[self.navigationController popViewControllerAnimated:YES];

you have in viewWillAppear/viewDidAppear method of the next screen