KINavigationController使用演示例子
运行效果
实现思路
创建pan手势，添加到页面中，监听手势的动作。重写push的方法，在push之前截图保存到数组。重写pop的方法，在pop之前删除截图。pop的动画效果是利用截图的image添加到topView上，从视觉效果上实现缩放、平移的动画效果。以下是具体的实现思路：
1.创建Pan手势识别器
delegate = self
let panRecognizer = UIPanGestureRecognizer(target: self, action: #selector(paningGestureReceive(recoginzer:)))
panRecognizer.delegate = self
view.addGestureRecognizer(panRecognizer)
//实现侧滑返回
interactivePopGestureRecognizer?.delegate = self
2.实现手势的相应事件
//MARK: - Events
@objc func paningGestureReceive(recoginzer:UIPanGestureRecognizer) {
//如果只有一个控制器或者不允许全屏返回，return
if self.viewControllers.count <= 1 || !canDragBack {
return
}
let touchPoint = recoginzer.location(in: UIApplication.shared.keyWindow)
switch recoginzer.state {
case .began:
isMoving = true
startTouch = touchPoint
if backgroundView == nil {
let frame = TOP_VIEW?.frame
backgroundView = UIView(frame: CGRect(x: 0, y: 0, width: (frame?.size.width)!, height: (frame?.size.height)!))
TOP_VIEW?.superview?.insertSubview(backgroundView!, belowSubview: TOP_VIEW!)
blackMask = UIView(frame: CGRect(x: 0, y: 0, width: (frame?.size.width)!, height: (frame?.size.height)!))
blackMask?.backgroundColor = UIColor.black
backgroundView?.addSubview(blackMask!)
}
backgroundView?.isHidden = false
if lastScreenShotView != nil {
lastScreenShotView?.removeFromSuperview()
}
let lastScreenShot = screenShotsList.lastObject as! UIImage
lastScreenShotView = UIImageView(image: lastScreenShot)
backgroundView?.insertSubview(lastScreenShotView!, belowSubview: blackMask!)
break
case .ended:
//手势结束，判断是返回还是回到原位
if touchPoint.x - (startTouch?.x)! > 50 {
UIView.animate(withDuration: 0.3, animations: {
self.moveView(withX: self.kMAXWidth)
}, completion: { (finished:Bool) in
self.popViewController(animated: false)
var frame = self.TOP_VIEW?.frame
frame?.origin.x = 0
self.TOP_VIEW?.frame = frame!
self.isMoving = false
self.backgroundView?.isHidden = true
// End paning,remove last screen shot
self.customAnimation.removeLastScreenShot()
})
} else {
UIView.animate(withDuration: 0.3, animations: {
self.moveView(withX: 0)
}, completion: { (finished:Bool) in
self.isMoving = false
self.backgroundView?.isHidden = true
})
}
return //直接返回，不在往下执行
case .cancelled:
UIView.animate(withDuration: 0.3, animations: {
self.moveView(withX: 0)
}, completion: { (finished:Bool) in
self.isMoving = false
self.backgroundView?.isHidden = true
})
return
default:
break
}
if isMoving! {
self.moveView(withX: touchPoint.x - (startTouch?.x)!)
}
}
3.创建截图需要的backgroundView和作为遮罩的blackMask，存放截图所需的数组
if backgroundView == nil {
let frame = TOP_VIEW?.frame
backgroundView = UIView(frame: CGRect(x: 0, y: 0, width: (frame?.size.width)!, height: (frame?.size.height)!))
TOP_VIEW?.superview?.insertSubview(backgroundView!, belowSubview: TOP_VIEW!)
blackMask = UIView(frame: CGRect(x: 0, y: 0, width: (frame?.size.width)!, height: (frame?.size.height)!))
blackMask?.backgroundColor = UIColor.black
backgroundView?.addSubview(blackMask!)
}
backgroundView?.isHidden = false
if lastScreenShotView != nil {
lastScreenShotView?.removeFromSuperview()
}
let lastScreenShot = screenShotsList.lastObject as! UIImage
lastScreenShotView = UIImageView(image: lastScreenShot)
backgroundView?.insertSubview(lastScreenShotView!, belowSubview: blackMask!)
4.在push前截图，并保存
override func pushViewController(_ viewController: UIViewController, animated: Bool) {
if self.viewControllers.count >= 1 {
let screenshot = getScreenshot()
if screenshot != nil {
screenShotsList.add(screenshot!)
}
}
super.pushViewController(viewController, animated: animated)
}
5.重写常用的pop方法,在pop前删除相应的截图
@discardableResult
override func popViewController(animated: Bool) -> UIViewController? {
screenShotsList.removeLastObject()
return super.popViewController(animated: animated)
}
override func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]? {
var removeCount = 0
for i in stride(from: viewControllers.count-1, to: 0, by: -1) {
if viewController == viewControllers[i] {
break
}
screenShotsList.removeLastObject()
removeCount = removeCount+1
}
customAnimation.removeCount = removeCount
return super.popToViewController(viewController, animated: animated)
}
override func popToRootViewController(animated: Bool) -> [UIViewController]? {
screenShotsList.removeAllObjects()
customAnimation.removeAllScreenShot()
return super.popToRootViewController(animated: animated)
}
到此处能实现手势整体返回的效果，要实现点击返回按钮也能整体返回，需要自定义返回动画。实现协议UIViewControllerAnimatedTransitioning。
6.让navigationController遵守UINavigationControllerDelegate实现下面的方法，在方法里面可根据operation判断需要自定义的类型(pop/push)
func navigationController(_ navigationController: UINavigationController,
animationControllerFor operation: UINavigationControllerOperation,
from fromVC: UIViewController,
to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning?
7.使用一个类实现UIViewControllerAnimatedTransitioning协议
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval
//定义动画
func animateTransition(using transitionContext: UIViewControllerContextTransitioning)
项目结构图
KINavigationController使用演示例子
注：本文著作权归作者，由demo大师代发，拒绝转载，转载需要作者授权
