title: Get full string in iOS8 Custom Keyboard Extension
body: <p>I'm creating a Custom Keyboard Extension for iOS 8.</p>
  
  <p>I want to get the whole string that the user wrote in the text input field.</p>
  
  <p>Unfortunately I stumble in to two main problems:</p>
  
  <p>1) I get null in this callback:</p>
  
  <pre><code>- (void)textDidChange:(id&lt;UITextInput&gt;)textInput
  </code></pre>
  
  <p>2) I only get partial String When I call these methods:</p>
  
  <pre><code>- [self.textDocumentProxy documentContextAfterInput];
  - [self.textDocumentProxy documentContextBeforeInput];
  </code></pre>
  
  <p>I want to get the whole string in the text input the user is currently editing
  what do you suggest i do?</p>
  
  <p>Thanks!</p>