我有这个形状,我在drawRect()中绘制
var rectanglePath = UIBezierPath()
override func drawRect(rect: CGRect) {
rectanglePath = UIBezierPath(rect: self.bounds)
rectanglePath.fillWithBlendMode(kCGBlendModeMultiply,alpha: 0.7)
layer.shouldRasterize = true
}
当调用prepareForEditing函数时,我想为rectanglePath设置动画.我试过了
func prepareForEditing(editing:Bool){
UIView.animateWithDuration(0.5,animations: {
self.rectanglePath = makeNewShape()
}
)
}
什么都没发生.你能告诉我我的代码有什么问题吗？
要为CGPath设置动画,您不能使用UIView.animation方法.
我创建了自定义UIView子类来向您展示如何为CGPaths形状设置动画,请参考注释并根据您的要求进行修改：
我创建了自定义UIView子类来向您展示如何为CGPaths形状设置动画,请参考注释并根据您的要求进行修改：
class MyView: UIView {
let shapeLayer = CAShapeLayer()
let maskLayer = CAShapeLayer()
var rectanglePath = UIBezierPath()
override func didMoveToSuperview() {
super.didMoveToSuperview()
backgroundColor = UIColor.clear
// initial shape of the view
rectanglePath = UIBezierPath(rect: bounds)
// Create initial shape of the view
shapeLayer.path = rectanglePath.cgPath
shapeLayer.strokeColor = UIColor.black.cgColor
shapeLayer.fillColor = UIColor.clear.cgColor
layer.addSublayer(shapeLayer)
//mask layer
maskLayer.path = shapeLayer.path
maskLayer.position = shapeLayer.position
layer.mask = maskLayer
}
func prepareForEditing(editing:Bool){
let animation = CABasicAnimation(keyPath: "path")
animation.duration = 2
// Your new shape here
animation.toValue = UIBezierPath(ovalIn: bounds).cgPath
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaSEOut)
// The next two line preserves the final shape of animation,// if you remove it the shape will return to the original shape after the animation finished
animation.fillMode = kCAFillModeForwards
animation.isRemovedOnCompletion = false
shapeLayer.add(animation,forKey: nil)
maskLayer.add(animation,forKey: nil)
}
}
