问题
I have a UINavigationController with toolbarHidden set to NO.
I have added UIBarButtonItems to navigationController.toolbar.
The toolbar is displayed, but the buttons are not...
What gives?
回答1:
Ok so apparently I misunderstood the usage of the setItems method on navigationController.
To remedy this I set the toolbar items on each view controller that is pushed onto the navigation controller's stack.
I guess if I wanted to have one toolbar persist through all the views I could add a new toolbar to the view controller holding my navigation controller then simply invoke setItems on my navigation controller.
I digress.
来源：https://stackoverflow.com/questions/2390533/uibarbuttonitems-not-showing-up-on-uitoolbar