2
イメージビューにUIDynamicsを追加し、そのためのパンジェスチャーを使用しました。それはパンジェスチャーでうまく動作しますが、ピンチジェスチャーを適用すると機能しません。大きな画像ビューを表示していますが、ドラッグを開始すると元のサイズに変更されます。ここでUIKitパン、回転、ピンチジェスチャーのダイナミクス
は私のコードです:
func handleAttachmentGesture(_ sender: UIPanGestureRecognizer) {
let location = sender.location(in: emojiSuperView!)
let boxLocation = sender.location(in: self)
switch sender.state {
case .began:
print("Your touch start position is \(location)")
print("Start location in image is \(boxLocation)")
animator.removeAllBehaviors()
let centerOffset = UIOffset(horizontal: boxLocation.x - self.bounds.midX, vertical: boxLocation.y - self.bounds.midY)
attachmentBehavior = UIAttachmentBehavior(item: self, offsetFromCenter: centerOffset, attachedToAnchor: location)
animator.addBehavior(attachmentBehavior)
case .ended:
print("Your touch end position is \(location)")
print("End location in image is \(boxLocation)")
animator.removeAllBehaviors()
// 1
let velocity = sender.velocity(in: emojiSuperView!)
let magnitude = sqrt((velocity.x * velocity.x) + (velocity.y * velocity.y))
if magnitude > ThrowingThreshold {
// 2
let pushBehavior = UIPushBehavior(items: [self], mode: .instantaneous)
pushBehavior.pushDirection = CGVector(dx: velocity.x/10, dy: velocity.y/10)
pushBehavior.magnitude = magnitude/ThrowingVelocityPadding
self.pushBehavior = pushBehavior
animator.addBehavior(pushBehavior)
// 3
let angle = Int(arc4random_uniform(20)) - 10
itemBehavior = UIDynamicItemBehavior(items: [self])
itemBehavior.friction = 0.2
itemBehavior.allowsRotation = true
itemBehavior.addAngularVelocity(CGFloat(angle), for: self)
animator.addBehavior(itemBehavior)
}
default:
attachmentBehavior.anchorPoint = sender.location(in: emojiSuperView!)
break
}
}
func recognizePinchGesture(sender: UIPinchGestureRecognizer)
{
weak var dynamicItem: UIDynamicItem?
// whatever your item is, probably a UIView
dynamicItem = self
let behavior = UIGravityBehavior(items: [dynamicItem!])
let animator = UIDynamicAnimator(referenceView: emojiSuperView!)
// or however you're getting your animator
animator.addBehavior(behavior)
sender.view!.transform = sender.view!.transform.scaledBy(x: sender.scale, y: sender.scale)
animator.updateItem(usingCurrentState: self)
self.animator.updateItem(usingCurrentState: self)
sender.scale = 1
}
いい質問+1、私も同じ問題に直面している、 – Dhiru