UITextField edit Animation 1 - more TextField - background (opacity) dimming and lighting CABasicAnimation

IOS 8.1, Xcode 6.1

Steps:

1. Create ViewController, create 2 TextField and add UITexField delegate codes
2. Add SecondView to self.view, and add TextFields to new UIView subviews
3. Add CABasicAnimations: dimming and lighting
4. Add the code which handle the animation
5. Test the code

Full tutorial: http://spotlessicode.com/post/102536092136/uitextfield-editing-animation-1-fade-in-fade-out

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