title: iOS: UIBarButton Proper Size
body: <p>In my iOS application on UIToolbar I have added "Done" custom button with image.</p>
  
  <pre><code>UIBarButtonItem *btnNextDoneDisable;
  UIToolbar *navigateQuestionBar;
  
  //*to add button
  
  UIImage *img_done = [UIImage imageNamed:DONE_RED_BTN_PNG(appDelegate.isIphone)];
          btn = [UIButton buttonWithType:UIButtonTypeCustom];
          [btn setImage:img_done forState:UIControlStateNormal];
          btn.frame = CGRectMake(0.0, 0.0, img_done.size.width, img_done.size.height);
          [btn addTarget:self action:@selector(doneClicked) forControlEvents:UIControlEventTouchUpInside];
          btnNextDoneDisable = [[UIBarButtonItem alloc] initWithCustomView:btn];
  
   [arrButtons addObject:btnNextDoneDisable];
  
  navigateQuestionBar.items = arrButtons;
  </code></pre>
  
  <p>Done button image sizes are:</p>
  
  <pre><code>80 × 30
  
  156 × 57
  </code></pre>
  
  <p>But this looks disturb on iPad Pro(11.0), <a href="https://i.stack.imgur.com/aB1q0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aB1q0.png" alt="Like This."></a></p>
  
  <p>What is the proper size for button?</p>