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我有一個UIView，它覆蓋了另一個UIView。當點擊覆蓋視圖時，我希望它「下降」，這是我們圍繞其底部中心點圍繞其x軸製作動畫的地方。UIView圖層在圍繞非中心定位點旋轉時移動
我實現了這個像這樣：
private func showCategories(animated: Bool)
{
UIView.animateWithDuration(2,
delay: 0,
options: [.CurveEaseIn],
animations: {
self.setAnchorPoint(CGPoint(x: 0.5, y: 1), forView: self.titleView)
var rotationAndPerspectiveTransform = CATransform3DIdentity
rotationAndPerspectiveTransform.m34 = 1/-500
rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, CGFloat(-179 * M_PI/180), 1, 0, 0);
self.titleView.layer.transform = rotationAndPerspectiveTransform;
}) { (success) -> Void in
//
}
}
我發現了一個解決方案，它說，改變錨點移動視圖，所以要解決它，你需要移動它採取在考慮錨點並轉型。它提供了此代碼：
private func setAnchorPoint(anchorPoint: CGPoint, forView view: UIView)
{
var newPoint = CGPoint(x: view.bounds.width * anchorPoint.x, y: view.bounds.height * anchorPoint.y)
var oldPoint = CGPoint(x: view.bounds.width * view.layer.anchorPoint.x, y: view.bounds.height * view.layer.anchorPoint.y)
newPoint = CGPointApplyAffineTransform(newPoint, view.transform);
oldPoint = CGPointApplyAffineTransform(oldPoint, view.transform);
var position = view.layer.position;
position.x -= oldPoint.x;
position.x += newPoint.x;
position.y -= oldPoint.y;
position.y += newPoint.y;
view.layer.position = position;
view.layer.anchorPoint = anchorPoint;
}
但是，這仍然不適用於我。我用錯了嗎？
P.s，我意識到animated參數尚未被記錄下來......這是爲了調試目的。