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| class CustomTransitioningAnimator: UIPercentDrivenInteractiveTransition {
var isDismiss: Bool!
weak var presentViewController: UIViewController!
var transitionContext: UIViewControllerContextTransitioning!
// 是否处于交互视图切换过程
var interacting = false
// 是否手势完成
var shouleComplete = true
init(presentViewController: UIViewController) {
super.init()
self.presentViewController = presentViewController
}
}
// MARK: - 手势操作
extension CustomTransitioningAnimator {
/**
处理手势操作
- parameter gestureRecognizer:
*/
func handleGesture(gestureRecognizer: UIPanGestureRecognizer) {
let translation = gestureRecognizer.translationInView(gestureRecognizer.view)
switch gestureRecognizer.state {
case UIGestureRecognizerState.Began:
interacting = true
if presentViewController is GoodsDetailViewController {
(presentViewController as! GoodsDetailViewController).delegate?.dismissPresentViewController()
}
case .Changed:
var fraction = translation.y / 200.0
fraction = fmin(fmax(fraction, 0.0), 1.0)
shouleComplete = fraction > 0.5
self.updateInteractiveTransition(fraction)
case .Ended, .Cancelled:
interacting = false
if !shouleComplete || gestureRecognizer.state == .Cancelled || gestureRecognizer.velocityInView(gestureRecognizer.view).y < 0 {
self.cancelInteractiveTransition()
} else {
self.finishInteractiveTransition()
}
default:
break
}
}
/**
开始手势拖拽
- parameter transitionContext:
*/
override func startInteractiveTransition(transitionContext: UIViewControllerContextTransitioning) {
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
self.transitionContext = transitionContext
UIView.animateWithDuration(transitionDuration(transitionContext)) {
var transform = CATransform3DIdentity
transform = CATransform3DTranslate(transform, 0, 15, 0)
transform.m24 = -1/5000
transform = CATransform3DScale(transform, 0.85, 1 , 1)
toViewController.view.layer.transform = transform
}
}
/**
手势拖动过程中不断更新
- parameter percentComplete: 更新百分比0~1
*/
override func updateInteractiveTransition(percentComplete: CGFloat) {
guard let _ = transitionContext else {
return
}
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
var transform = CATransform3DIdentity
transform.m24 = -1/3500 + 1/3500 * percentComplete
transform = CATransform3DScale(transform, 0.85 + 0.15 * percentComplete, 0.9 + 0.1 * percentComplete , 1)
toViewController.view.layer.transform = transform
toViewController.view.alpha = 0.5 + 0.5 * percentComplete
}
/**
完成手势dismiss
*/
override func finishInteractiveTransition() {
let finalFrame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width, height: UIScreen.mainScreen().bounds.height)
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
let fromViewController = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
UIView.animateWithDuration(2 * transitionDuration(transitionContext), animations: {
fromViewController.view.frame = CGRect(x: 0, y: UIScreen.mainScreen().bounds.height, width: UIScreen.mainScreen().bounds.width, height: UIScreen.mainScreen().bounds.height)
toViewController.view.layer.transform = CATransform3DIdentity
toViewController.view.alpha = 1
toViewController.view.frame = finalFrame
}) { (finished) in
if finished {
self.transitionContext.completeTransition(true)
self.transitionContext = nil
}
}
}
/**
手势取消操作
*/
override func cancelInteractiveTransition() {
let fromViewController = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
UIView.animateWithDuration(transitionDuration(transitionContext), delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: { () -> Void in
fromViewController.view.userInteractionEnabled = false
fromViewController.view.frame = CGRect(x: 0, y: 0, width: fromViewController.view.frame.width, height: fromViewController.view.frame.height)
}) { (finished) -> Void in
if finished {
UIView.animateWithDuration(self.transitionDuration(self.transitionContext), delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
var transform = CATransform3DIdentity
transform = CATransform3DTranslate(transform, 0, -15, 0)
transform = CATransform3DScale(transform, 0.8,0.9, 1)
toViewController.view.layer.transform = transform
toViewController.view.alpha = 0.5
}) { (finished) in
if finished {
fromViewController.view.userInteractionEnabled = true
self.transitionContext.completeTransition(false)
}
}
}
}
}
}
|
