类似iOS7中Game Center浮动气泡的效果。
iOS7 Game Center Floating Bubble Effects.
我暂时没有封装，只当是给各位一个实现的思路吧。
##完整代码就这么多：
Here is the whole code:
for bt in bubbles{
//1.绕中心圆移动 Circle move
var pathAnimation = CAKeyframeAnimation(keyPath: "position")
pathAnimation.calculationMode = kCAAnimationPaced
pathAnimation.fillMode = kCAFillModeForwards
pathAnimation.removedOnCompletion = false
pathAnimation.repeatCount = Float.infinity
pathAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
if (bt == self.bubble_yellow) {
pathAnimation.duration = 5.0
}else if (bt == self.bubble_orange){
pathAnimation.duration = 6.0
}else if (bt == self.bubble_red){
pathAnimation.duration = 7.0
}else if (bt == self.bubble_blue){
pathAnimation.duration = 8.0
}
var curvedPath = CGPathCreateMutable()
let circleContainer = CGRectInset(bt.frame, bt.frame.size.width/2-3, bt.frame.size.width/2-3)
CGPathAddEllipseInRect(curvedPath, nil, circleContainer)
pathAnimation.path = curvedPath
bt.layer.addAnimation(pathAnimation, forKey: "myCircleAnimation")
//2.X方向上的缩放 scale in X
var scaleX = CAKeyframeAnimation(keyPath:"transform.scale.x")
scaleX.values = [1.0, 1.1, 1.0]
scaleX.keyTimes = [0.0, 0.5,1.0]
scaleX.repeatCount = Float.infinity
scaleX.autoreverses = true
scaleX.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
if (bt == self.bubble_yellow) {
scaleX.duration = 3
}else if (bt == self.bubble_orange){
scaleX.duration = 4
}else if (bt == self.bubble_red){
scaleX.duration = 6
}else if (bt == self.bubble_blue){
scaleX.duration = 5
}
bt.layer.addAnimation(scaleX, forKey: "scaleXAnimation")
//2.Y方向上的缩放 scale in Y
var scaleY = CAKeyframeAnimation(keyPath:"transform.scale.y")
scaleY.values = [1.0, 1.1, 1.0]
scaleY.keyTimes = [0.0, 0.5,1.0]
scaleY.repeatCount = Float.infinity
scaleY.autoreverses = true
scaleX.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
if (bt == self.bubble_yellow) {
scaleY.duration = 4
}else if (bt == self.bubble_orange){
scaleY.duration = 2
}else if (bt == self.bubble_red){
scaleY.duration = 3
}else if (bt == self.bubble_blue){
scaleY.duration = 5
}
bt.layer.addAnimation(scaleY, forKey: "scaleYAnimation")
}