spring动画(swift)

by 伍雪颖

loginButton.center.y
+=
30

loginButton.alpha
=
0

UIView.animateWithDuration(1,
delay:
0.5,

usingSpringWithDamping:
0.5,

initialSpringVelocity:
0,

options: .AllowUserInteraction,

animations: {

self.loginButton.center.y
-=
30

self.loginButton.alpha
=
1

}, completion:
nil)

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