Problem drag buttons on bottom toolbar in IB

Question

I add a toolbar in the bottom view by IB. But I can not drag UIBarItem or button on the toolbar. The button bounced back and did not appeared on the toolbar. It also happened for Navigation Bar. Anything wrong?

Answer 1

Thanks for the thorough answers to my questions, Charlie.
CharlieCL wrote:
I set the toolbar in the view selection from unspecified to toolbar. There is no
button on the toolbar.
I think you've been trying to add a real toolbar object by asking IB to display a simulated toolbar at the bottom of your view.
When you select your content view in IB, open the Attributes Inspector and expand the "Simulated User Interface Elements" panel, you have the choice of adding placeholders to your view. These can be very useful when the view controller's edit window doesn't display a bar which will be visible at run time.
For example, if you create a nav controller in your code, its nav bar will normally be visible at the top of every controlled view--i.e. the view of each controller on the stack--at runtime. But you won't see that bar in the xib file belonging to each of those controllers. That's when you might want to add a "simulated nav bar" to the edit window. The placeholder keeps you from accidentally putting some of your view content where it will be covered by the bar, and lets you see how the screen will look at runtime.
Since a simulated bar never causes a real bar to be created at runtime, IB won't let you add controls to that bar.
So the solution to your question is to always drag a bar object from the IB Library when you intend to specify creation of a real bar at runtime. You shouldn't have any problem adding controls to a bar you obtain from the Library (as you confirmed in the answer to question 4).
\- Ray