我不知道为什么,但这段代码可以工作。
更新:
我成功地将缩放、平移和旋转组合在一起,从任何变换状态到任何新的变换状态。
我认为动画开始时重新解释了变换。
起始变换的锚点在新变换中被考虑,然后我们将其转换为旧变换。
self.v = UIView(frame: CGRect(x: 50, y: 50, width: 50, height: 50))
self.v?.backgroundColor = .blue
self.view.addSubview(v!)
func buttonPressed() {
let view = self.v!
let m1 = view.transform
let tempScale = CGFloat(arc4random()%10)/10 + 1.0
let tempRotae:CGFloat = 1
let m2 = m1.translatedBy(x: CGFloat(arc4random()%30), y: CGFloat(arc4random()%30)).scaledBy(x: tempScale, y: tempScale).rotated(by:tempRotae)
self.animationViewToNewTransform(view: view, newTranform: m2)
}
func animationViewToNewTransform(view: UIView, newTranform: CGAffineTransform) {
let normalizedAnchor0 = view.layer.anchorPoint
let anchor0 = CGPoint(x: normalizedAnchor0.x * view.bounds.width, y: normalizedAnchor0.y * view.bounds.height)
let mAnchor0 = CGAffineTransform.identity.translatedBy(x: anchor0.x, y: anchor0.y)
let m1 = view.transform
let m2 = newTranform
let matrix1 = mAnchor0.inverted().concatenating(m1).concatenating(mAnchor0)
let matrix2 = mAnchor0.inverted().concatenating(m2).concatenating(mAnchor0)
let anchor1 = anchor0.applying(matrix1)
let mAnchor1 = CGAffineTransform.identity.translatedBy(x: anchor1.x, y: anchor1.y)
let anchor2 = anchor0.applying(matrix2)
let txty2 = CGPoint(x: anchor2.x - anchor0.x, y: anchor2.y - anchor0.y)
let txty2plusAnchor2 = CGPoint(x: txty2.x + anchor2.x, y: txty2.y + anchor2.y)
let anchor1InM2System = anchor1.applying(matrix2.inverted()).applying(mAnchor0.inverted())
let txty2ToM0System = txty2plusAnchor2.applying(matrix2.inverted()).applying(mAnchor0.inverted())
let txty2ToM1System = txty2ToM0System.applying(mAnchor0).applying(matrix1).applying(mAnchor1.inverted())
var m1New = m1
m1New.tx = txty2ToM1System.x + anchor1InM2System.x
m1New.ty = txty2ToM1System.y + anchor1InM2System.y
view.transform = m1New
UIView.animate(withDuration: 1.4) {
view.transform = m2
}
}
我也尝试了zScale解决方案,如果在第一个变换或每个变换中设置zScale非1,则似乎也可以工作。
let oldTransform = view.layer.transform
let tempScale = CGFloat(arc4random()%10)/10 + 1.0
var newTransform = CATransform3DScale(oldTransform, tempScale, tempScale, 1.01)
newTransform = CATransform3DTranslate(newTransform, CGFloat(arc4random()%30), CGFloat(arc4random()%30), 0)
newTransform = CATransform3DRotate(newTransform, 1, 0, 0, 1)
UIView.animate(withDuration: 1.4) {
view.layer.transform = newTransform
}
CGAffineTransformTranslate(secondScale, 150, 300)
,会发生什么? - Ian MacDonaldsecondConcat
,还是先跳跃,返回到 concat,然后再动画到secondConcat
? - Logan Moseley