Swift / iOS8：仅允许某些键盘

Question

How can I deny certain keyboards to be displayed in iOS8?

The actual case is that Users can make a REST Call in my Search Field - should they switch to the Emoji keyboard and send them, Alamofire will crash, not recognizing the Input --> subsequently my App crashes.

Answer 1

Rule 1 in security:

Never Trust User Input

Filter the input. You can not trust the user's input even after denying some keyboards.

You may want to use a regex for the filtering.

Side note: You will have to do the filtering on the server side too. Your API may be called from an other location. Potentially, that's a huge security issue. Hackers can do some nasty things if you don't filter your parameters.