In UITableView I configure self.navigationItem.leftBarButtonItem with a button. Now I want to reload this button to update text on this button, but it's on Navigation bar. I can update UITableView by 

 [self.tableView reloadData]

but How to update Navigation bar?

Update: I'm NOT init the title of button, but reload it. So any init code (such as self.navigationItem.leftBarButtonItem.title = @"balabala") doesn't work, because it does NOT take effect immediately.

ios uitableview uinavigationbar uibarbuttonitem
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