title: iPhone Navigation-Based application - some global toolbar questions
body: <p>I started iPhone development two months ago, so I can't call myself "expert" ;-) But I learned a lot in these two months, a lot here from stackoverflow :) <br>
  I'm working on an iPhone app which is based on the "Navigation-Based application" app template. My RootViewController is, of course, an UITableView. From that TableView, I can navigate to some views and one TableView.<br>
  I'm using a global toolbar, it's called in the RootViewController. Buttons are added to it in the view that needs the buttons. <br>
  Now, I have some questions regarding the use of the toolbar</p>
  
  <ol>
  <li><p>I insert a flexible space with that code:</p>
  
  <p>UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];</p></li>
  </ol>
  
  <p>and a fixed space like this:</p>
  
  <pre><code> UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:self action:nil];
  </code></pre>
  
  <p>My question: The flexible space is working, but how do I tell the fixed space which width it should have?
  <br><br>
  2. I noticed that my Todo-App "Things" uses a global toolbar with switching button sets. But in Things, there's some kind of fading effect when the button set is changing. How can I do that in my app?<br><br></p>