ios - 带有平移、旋转和捏合手势的 UIKit Dynamics
<p><p>我已将 UIDynamics 添加到 imageview 并为此使用平移手势。平移手势可以正常工作，但是当我应用捏手势时它不起作用。它显示大 ImageView ，但是当我开始拖动时，它会更改为原始大小。</p>
<p>这是我的代码:</p>
<pre><code>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: , 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: )
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: )
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
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>当用户执行任何变换事件时，将当前变换保存到全局变量。 </p>
<p>之后，当平移开始时，使用 UIAttachmentBehavior 的 action 属性在开始状态下分配新的变换。</p>
<pre><code> attachmentBehavior.action = {
self.attachmentBehavior.items.transform = self.aTransform
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 带有平移、旋转和捏合手势的 UIKit Dynamics，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/44948982/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/44948982/
</a>
</p>
页:
[1]