我有一个目标的图像,我正在尝试使用动画来裁剪外环而不调整其大小。我正在使用UIBelzierPath来执行此操作,我有些原因无法将其直接放在我的图像上,因为它只会动画到右下角,就像直接应用于imageView一样。我究竟做错了什么?我对动画很挣扎,所以任何帮助都会很棒。
@IBOutlet weak var image: UIImageView!
@IBAction func animate(sender: AnyObject) {
animateCollapse()
}
private func animateCollapse() {
let view = image
let circleMaskPathInitial = UIBezierPath(ovalInRect: view.frame)
let circleMaskPathFinal = UIBezierPath(ovalInRect: CGRectInset(view.frame, 10 , 10))
performAnimation(circleMaskPathInitial, finalPath: circleMaskPathFinal)
}
private func performAnimation(initialPath: UIBezierPath, finalPath: UIBezierPath) {
let maskLayer = CAShapeLayer()
maskLayer.path = finalPath.CGPath
image.layer.mask = maskLayer
let maskLayerAnimation = CABasicAnimation(keyPath: "path")
maskLayerAnimation.fromValue = initialPath.CGPath
maskLayerAnimation.toValue = finalPath.CGPath
maskLayerAnimation.duration = 1.0
maskLayerAnimation.delegate = self
maskLayer.addAnimation(maskLayerAnimation, forKey: "path")
}
答案 0 :(得分:2)
尝试将let circleMaskPathInitial = UIBezierPath(ovalInRect: view.frame)
更改为let circleMaskPathInitial = UIBezierPath(ovalInRect: view.bounds)
。我的猜测是你真的希望矩形的原点位于图像视图的(0,0)处,但它的帧的原点不是(0,0)。