title: NSLayoutManager with multiple NSTextContainers causes UITextViews to not be selectable/editable
body: <p>I am trying to achieve a multi page text editing layout, as in Pages, MS Word, ... . On OS X I can achieve this by creating one NSLayoutManager with one NSTextStorage for multiple NSTextViews. Each NSTextView has its own NSTextContainer. See below code for OS X. A simple example with text spreading between two NSTextViews:</p>
  
  <pre><code>import Cocoa
  
  class ViewController: NSViewController {
  
  let layoutManager = NSLayoutManager()
  let textStorage = NSTextStorage(attributedString: NSAttributedString(string: "This is a test"))
  let textContainer1 = NSTextContainer()
  let textContainer2 = NSTextContainer()
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      // Do any additional setup after loading the view.
  
      textStorage.addLayoutManager(layoutManager)
  
      textContainer1.widthTracksTextView = true
      textContainer1.heightTracksTextView = true
      textContainer2.widthTracksTextView = true
      textContainer2.heightTracksTextView = true
  
      let textView1 = NSTextView(frame: CGRectMake(0, 100, 100, 100), textContainer: textContainer1)
      textView1.backgroundColor = NSColor.greenColor()
      self.view.addSubview(textView1)
      layoutManager.addTextContainer(textContainer1)
  
  
      let textView2 = NSTextView(frame: CGRectMake(200, 100, 100, 100), textContainer: textContainer2)
      textView2.backgroundColor = NSColor.greenColor()
      self.view.addSubview(textView2)
      layoutManager.addTextContainer(textContainer2)
  }
  }
  </code></pre>
  
  <p>This works.</p>
  
  <p>However, when I try to do the same on iOS with UITextView, the UITextViews become not selectable or editable. See my code for iOS:</p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController, UITextViewDelegate {
  
  let layoutManager = NSLayoutManager()
  let textStorage = NSTextStorage(attributedString: NSAttributedString(string: "This is a test. This text should spread over two UITextViews. Bla bla bla bla bla bla bla bla bla bla bla bla bla"))
  let textContainer1 = NSTextContainer()
  let textContainer2 = NSTextContainer()
  
  override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.        
  
      textStorage.addLayoutManager(layoutManager)
  
      textContainer1.heightTracksTextView = true
      textContainer1.widthTracksTextView = true
      textContainer2.heightTracksTextView = true
      textContainer2.widthTracksTextView = true
  
      let textView1 = UITextView(frame: CGRectMake(0, 100, 100, 100), textContainer: textContainer1)
      textView1.scrollEnabled = false
      textView1.delegate = self
      textView1.editable = true
      textView1.selectable = true
      textView1.backgroundColor = UIColor.greenColor()
      self.view.addSubview(textView1)
      layoutManager.addTextContainer(textContainer1)
  
      let textView2 = UITextView(frame: CGRectMake(200, 100, 100, 100), textContainer: textContainer2)
      textView2.scrollEnabled = false
      textView2.delegate = self
      textView2.editable = true
      textView2.selectable = true
      textView2.backgroundColor = UIColor.greenColor()
      self.view.addSubview(textView2)
      layoutManager.addTextContainer(textContainer2)
  
  }
  }
  </code></pre>
  
  <p>The text flows from one UITextView to the other, but it is not editable. I would be extremely thankful for any advice. I googled the issue and found other people experiencing the same problem, but found no solutions.</p>