Open Radar

 
Summary:
input hashtag on SLComposeViewController with twitter  very frequently causes broken UI in Japanese Language.
I think it is an problem of Twitter or  Social.framework.

code example:
```
// in ViewController
func postToTwitter(url:NSURL){

let type = SLServiceTypeTwitter
if !SLComposeViewController.isAvailableForServiceType(type) {
   print("twitter is invalid")
   return
}

let controller = SLComposeViewController(forServiceType: social.type)
controller.addURL(url)

controller.setInitialText("my initial text")

presentViewController(controller, animated:true, completion:nil)
}        
```

Steps to Reproduce:

1. Set Japanese language in iOS Settings.
2. Execute the sample code or open any app using SLComposeViewController(i.e. Yelp! app)
3. Open SLComposeViewController.
4. Input hash ('#') and some text without enter key (alphabets or Japanese characters. i.e. type "#a" )
5. If nothing was happened, try (3) again.
6. The dialog becomes empty.(like the attached file)


Expected Results:
keep on editing while input tweets text.

Actual Results:
SLComposeViewController became empty alert dialog.
(please see screenshot)


Version:
iOS9.2.1

Notes:
Note: 
(1) This issue is never occurred with English Language settings.
(2) I tried my code and Yelp! application.
(3) I think this problem is caused by hashtag completion. (its ok if type enter key before typing any text after hash(#) )
(4) It may be 1 or 2 times. 

Configuration:
iPhone6+, NTT DOCOMO, Using Wi-Fi