How to change and animate NSLayoutConstraints programmatically?

How to change and animate NSLayoutConstraints programmatically?

References

Reference NO 1

http://stackoverflow.com/questions/15185757/how-to-change-and-animate-nslayoutconstraints-programmatically

Reference NO 2

http://stackoverflow.com/questions/14687343/using-nslayoutconstraints-when-adding-a-subview-with-simple-animation

Reference NO 3

http://stackoverflow.com/questions/17155609/set-nslayoutconstraints-for-subview-to-parent-view

Reference NO 4

http://stackoverflow.com/questions/16322134/nslayoutconstraint-animation-on-monomac

Reference NO 5

http://stackoverflow.com/questions/17108398/black-screen-after-setting-translatesautoresizingmaskintoconstraints-to-no

Reference NO 6

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Reference NO 7

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Reference NO 8

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