Fixed animation Xcode 6.1.1

I Fixed an issue that animation when using the XCode6.1.1 does not work.
If no problem in this way, I am glad when you get to merge.
I wrote the commit message in Japanese, if modification of the message is required, I will fix my message.
This pull Request is my first pull request, So if this is wrong, I am happy when you be pointed out.

Finally, I'm poor at English.If you can't understand what I mean, please let me know.
Sorry for any inconvinience I may cause you.