Create a custom international keyboard for iPhone

Question

Is it possible to use the international keyboard function for the iPhone and create a custom keyboard that can be used throughout the phone, not only in a specific application?

Like the Emoji keyboard, but I have the impression that it is somehow native to iOS and is disabled by default?

I have considered many questions regarding this, I would like to receive a definitive answer.

Answer 1

According to Apple submission guidelines :

• 2.5 Applications using non-public APIs will be rejected
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Answer 2

iOS 8 : https://developer.apple.com/library/ios/documentation/General/Conceptual/ExtensibilityPG/Keyboard.html

Answer 3

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http://itunes.apple.com/us/app/emoji-free!/id332509635?mt=8

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Emoji Enabeling

Answer 4

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