View Animations
UIView.animate(withDuration: 0.25,
delay: 0,
options: [],
animations: {
}, completion: nil)
Animatable properties
bounds
frame
center
backgroundColor
alpha
transform
frame bounds transform之间的关系
frame: 当前相对父视图的坐标系的位置和大小
bounds：自身坐标系的位置和大小，觉得subViews的frame
transform 变换（位移动，缩放，旋转），transform改变时，会影响frame，不会影响bounds
Animation options： 详见 AnimationOptions
UIView.animate(withDuration: 0.5, delay: 0.4,
options: .repeat,
animations: {
self.password.center.x += self.view.bounds.width
},
completion: nil
)
Animation easing
curveLinear: 匀速动画
.curveEaseIn: 动画开始时加速
.curveEaseOut: 动画结束时，减速
.curveEaseInOut: 动画开始时加速， 减速
SpringAnimations
UIView.animate(withDuration: 0.5,
delay: 0.5,
usingSpringWithDamping: 0.5,
initialSpringVelocity: 0.0,
options: [],
animations: {
self.loginButton.center.y -= 30.0
self.loginButton.alpha = 1.0
}, completion: nil)
usingSpringWithDamping: 取值在 0 ~ 1.0，值越大，弹簧的刚度越大
initialSpringVelocity: 控制动画的初始速度。 值1.0设置动画的速度以覆盖动画的总距离（在一秒的跨度内）。 较大和较小的值将导致动画具有或多或少的速度。
TransitionAnimations
用于转场的动画Options
.transitionFlipFromLeft
.transitionFlipFromRight
.transitionCurlUp
.transitionCurlDown
.transitionCrossDissolve
.transitionFlipFromTop
.transitionFlipFromBottom
使用转场动画的场景：
-
添加View时
UIView.transition(with: animationContainerView, duration: 0.33, options: [.curveEaseOut, .transitionFlipFromBottom], animations: { self.animationContainerView.addSubview(newView) }, completion: nil ) -
移除View时
UIView.transition(with: animationContainerView, duration: 0.33, options: [.curveEaseOut, .transitionFlipFromBottom], animations: { self.newView.removeFromSuperview() }, completion: nil ) -
隐藏或显示View时
UIView.transition(with: self.newView, duration: 0.33, options: [.curveEaseOut, .transitionFlipFromBottom], animations: { self.newView.isHidden = true }, completion: nil ) -
替换View时
UIView.transition(from: oldView, to: newView, duration: 0.33, options: .transitionFlipFromTop, completion: nil)
Keyframe
- options: 详情查看UIViewKeyframeAnimationOptions
UIView.animateKeyframes(withDuration: 1.5, delay: 0.0, animations: {
//add keyframes
UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 0.25, animations: {
self.planeImage.center.x += 80.0
self.planeImage.center.y -= 10.0
})
UIView.addKeyframe(withRelativeStartTime: 0.1, relativeDuration: 0.4) {
self.planeImage.transform = CGAffineTransform(rotationAngle: -.pi / 8)
}
UIView.addKeyframe(withRelativeStartTime: 0.25, relativeDuration: 0.25) {
self.planeImage.center.x += 100.0
self.planeImage.center.y -= 50.0
self.planeImage.alpha = 0.0
}
UIView.addKeyframe(withRelativeStartTime: 0.51, relativeDuration: 0.01) {
self.planeImage.transform = .identity
self.planeImage.center = CGPoint(x: 0.0, y: originalCenter.y)
}
UIView.addKeyframe(withRelativeStartTime: 0.55, relativeDuration: 0.45) {
self.planeImage.alpha = 1.0
self.planeImage.center = originalCenter
}
}, completion: nil)
Layer Animations
View Animation 和 Layer Animation的区别
-
layer与View（就动画而言）不同，原因如下：
图层是模型对象–它公开数据属性并且不实现任何逻辑。 它没有复杂的自动版式依赖性，也没有处理用户交互。
它具有预定义的可见特征-这些特征是许多数据属性，它们会影响内容在屏幕上的呈现方式，例如边界线，边界颜色，位置和阴影。（预先会绘制一个layer）
Core Animation直接在GPU上优化了图层内容的缓存和快速绘制。
Views
视图布局，层级复杂
存在用户用户交互
通常具有在CPU的主线程上执行的自定义逻辑或自定义绘图代码
非常灵活，强大，有很多子类可以继承
Layers
层次结构简单，布局解析速度快，绘制速度快。
没有响应者链开销。
默认情况下没有自定义逻辑。 并直接在GPU上绘制。
不够灵活，子类继承较少
Layer动画流程
设置Layer动画时，控件本身本身不具有动画效果，当动画开始时，预先渲染的动画layer（presentation layer）将会替代控件，同时控件暂时隐藏，动画过程中不能交互
动画完成后 presentation layer 将从屏幕上删除，原始Layer再次显示自己。（动画结束需要更新layer的属性值为动画结束时的值）
Animation Properties
bounds
postion: position.x position.y
transform :transform.scale(x, y, z), transform.roate(x, y, z)
border: boorderWidth, backroudClolor, borderColor, corner
shadow: shadowOffset, shadowOpacity, shadowPath, shadowRadius
contents
mask
opacity
path
strokeEnd
strokeStart
let flyRight = CABasicAnimation(keyPath: "position.x")
flyRight.fromValue = -view.bounds.size.width / 2
flyRight.toValue = view.bounds.size.width / 2
flyRight.fillMode = .forwards
postion, anchorPoint, frame, bounds之间的区别
anchorPoint(锚点): 视图的几何操作（旋转，平移，缩放）的中心，
-
position 是相对layer的anchoorPoint 相对于superLayer的位置，即View的center
postion.x = frame.origin.x + anchorPont.x * frame.width postion.y = frame.origin.y + anchorPont.y * frame.height -
frame 当前layer相对superLayer的位置和大小, 最终由View体现
frame.x = postion.x - anchorPont.x * frame.width frame.y = postion.y - anchorPont.y * frame.height -
bounds 当layer自身的坐标系的位置和大小
-
注意：当前改变了anchorPoint，frame会发生变化（尤其是在做transform动画时），但是position没有变化，所以一定要还原位移变化(手动改变center的值)
extension UIView { func setAnchorPoint(_ point: CGPoint) { let oldOrigin = frame.origin layer.anchorPoint = point let newOrigin = frame.origin var transition: CGPoint = .zero transition.x = newOrigin.x - oldOrigin.x transition.y = newOrigin.y - oldOrigin.y center = CGPoint(x: center.x - transition.x, y: center.y - transition.y) center = CGPoint(x: oldOrigin.x + layer.anchorPoint.x * frame.width , y: oldOrigin.y + layer.anchorPoint.y * frame.height) /// center = CGPoint(x: oldOrigin.x + layer.anchorPoint.x * frame.width, y:oldOrigin.y + layer.anchorPoint.y * frame.height) } }
-
fillMode
forwards: 动画结束停留在最后一帧
backwards：动画开始前，处于动画的第一帧
both：结合了forwards与backwards的特点，即动画开始前，处于动画的第一帧，动画结束停留在最后一帧
removed：动画结束，移除动画
CAAnimationGroup
let groupAnimation = CAAnimationGroup()
groupAnimation.beginTime = CACurrentMediaTime() + 0.5
groupAnimation.duration = 0.5
groupAnimation.fillMode = .backwards
group.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
let scaleDown = CABasicAnimation(keyPath: "transform.scale")s
caleDown.fromValue = 3.5
scaleDown.toValue = 1.0
let rotate = CABasicAnimation(keyPath: "transform.rotation")
rotate.fromValue = .pi / 4.0
rotate.toValue = 0.0
let fade = CABasicAnimation(keyPath: "opacity")fade.fromValue = 0.0
fade.toValue = 1.0
groupAnimation.animations = [scaleDown, rotate, fade]
Animation easing
-
EaseIn
easeIn.png
-
EaseOut
easeOut.png
-
EaseInEaseOut
easeInEaseOut.png
More timing options
-
Repeating animations
flyLeft.repeatCount = 4 flyLeft.autoreverses = true -
Change the animation speed
flyLeft.speed = 2.0
Layer Springs - CASpringAnimation
damping: 阻尼系数， 阻止弹簧伸缩的系数，阻尼系数越大，停止越快
mass: 运动的质量，影响图层运动时的弹簧惯性，质量越大，弹簧拉伸和压缩的幅度越大, 默认为1.0
stiffness: 刚度，默认为100，为正，为0时，弹性越软，值越大，弹性越硬
initialVelocity： 初始的速度，速率为正数时，速度方向与运动方向一致，速率为负数时，速度方向与运动方向相反
settlingDuration 估算时间 返回弹簧动画到停止时的估算时间，根据当前的动画参数估算
let jump = CASpringAnimation(keyPath: "position.y")
jump.initialVelocity = 100.0
jump.mass = 10.0
jump.stiffness = 1500.0
jump.damping = 50.0
jump.fromValue = textField.layer.position.y + 1.0
jump.toValue = textField.layer.position.y
jump.duration = jump.settlingDuration
let flash = CASpringAnimation(keyPath: "borderColor")
flash.damping = 7.0
flash.stiffness = 200.0
flash.fromValue = UIColor(red: 1.0, green: 0.27, blue: 0.0, alpha:
1.0).cgColor
flash.toValue = UIColor.white.cgColor
flash.duration = flash.settlingDuration
textField.layer.add(flash, forKey: nil)
Layer Keyframe Aniamtions - CAKeyframeAnimation
几个重要的属性
values： 动画的值
path：动画的路径
keyTimes：帧时长
timingFunctions：帧时间函数
calculationMode: 帧计算模式
let wobble = CAKeyframeAnimation(keyPath: "transform.rotation")
wobble.duration = 0.25
wobble.repeatCount = 4
wobble.values = [0.0, -.pi/4.0, 0.0, .pi/4.0, 0.0]
wobble.keyTimes = [0.0, 0.25, 0.5, 0.75, 1.0]
heading.layer.add(wobble, forKey: nil)
