向导航堆栈添加新控制器时：
self.navigationController!.pushViewController(PushedViewController(), animated: true)
它从右边出现：
如何改变动画的方向，让它从左边出现？
【问题讨论】：
标签： ios swift animation uinavigationcontroller
你可以使用第三方库，你可以在github.com或cocoacontrols.com作为导航抽屉搜索它们
就我而言，我使用这个 https://github.com/CosmicMind/Material#NavigationDrawer
其他 https://www.cocoacontrols.com/search?q=Drawer
https://github.com/dekatotoro/SlideMenuControllerSwift
【讨论】：
Swift 5.1：从不同方向继续前进
这是一个针对不同 segue 方向的简单扩展。 （在 Swift 5 中测试）
看起来你想使用 segueFromLeft() 我还添加了一些其他示例。
extension CATransition {
//New viewController will appear from bottom of screen.
func segueFromBottom() -> CATransition {
self.duration = 0.375 //set the duration to whatever you'd like.
self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
self.type = CATransitionType.moveIn
self.subtype = CATransitionSubtype.fromTop
return self
}
//New viewController will appear from top of screen.
func segueFromTop() -> CATransition {
self.duration = 0.375 //set the duration to whatever you'd like.
self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
self.type = CATransitionType.moveIn
self.subtype = CATransitionSubtype.fromBottom
return self
}
//New viewController will appear from left side of screen.
func segueFromLeft() -> CATransition {
self.duration = 0.1 //set the duration to whatever you'd like.
self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
self.type = CATransitionType.moveIn
self.subtype = CATransitionSubtype.fromLeft
return self
}
//New viewController will pop from right side of screen.
func popFromRight() -> CATransition {
self.duration = 0.1 //set the duration to whatever you'd like.
self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
self.type = CATransitionType.reveal
self.subtype = CATransitionSubtype.fromRight
return self
}
//New viewController will appear from left side of screen.
func popFromLeft() -> CATransition {
self.duration = 0.1 //set the duration to whatever you'd like.
self.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
self.type = CATransitionType.reveal
self.subtype = CATransitionSubtype.fromLeft
return self
}
}
以下是实现上述扩展的方法：
let nav = self.navigationController //grab an instance of the current navigationController
DispatchQueue.main.async { //make sure all UI updates are on the main thread.
nav?.view.layer.add(CATransition().segueFromLeft(), forKey: nil)
nav?.pushViewController(YourViewController(), animated: false)
}
【讨论】：
let obj = self.storyboard?.instantiateViewController(withIdentifier: "ViewController")as! ViewController
let transition:CATransition = CATransition()
transition.duration = 0.3
transition.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
transition.type = .push
transition.subtype = .fromLeft
self.navigationController?.view.layer.add(transition, forKey: kCATransition)
self.navigationController?.pushViewController(obj, animated: true)
当你使用 popToViewController 时
transition.subtype = kCATransitionFromRight
【讨论】：
好的，这是适合您的插入式解决方案。添加名为LeftToRightTransitionProxy.swift 的文件和下一个内容
import UIKit
final class LeftToRightTransitionProxy: NSObject {
func setup(with controller: UINavigationController) {
controller.delegate = self
}
}
extension LeftToRightTransitionProxy: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if operation == .push {
return AnimationController(direction: .forward)
} else {
return AnimationController(direction: .backward)
}
}
}
private final class AnimationController: NSObject, UIViewControllerAnimatedTransitioning {
enum Direction {
case forward, backward
}
let direction: Direction
init(direction: Direction) {
self.direction = direction
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let toView = transitionContext.view(forKey: .to),
let fromView = transitionContext.view(forKey: .from) else {
return
}
let container = transitionContext.containerView
container.addSubview(toView)
let initialX: CGFloat
switch direction {
case .forward: initialX = -fromView.bounds.width
case .backward: initialX = fromView.bounds.width
}
toView.frame = CGRect(origin: CGPoint(x: initialX, y: 0), size: toView.bounds.size)
let animation: () -> Void = {
toView.frame = CGRect(origin: .zero, size: toView.bounds.size)
}
let completion: (Bool) -> Void = { _ in
let success = !transitionContext.transitionWasCancelled
if !success {
toView.removeFromSuperview()
}
transitionContext.completeTransition(success)
}
UIView.animate(
withDuration: transitionDuration(using: transitionContext),
animations: animation,
completion: completion
)
}
}
你可以这样使用它：
final class ViewController: UIViewController {
let animationProxy = LeftToRightTransitionProxy()
override func viewDidLoad() {
super.viewDidLoad()
animationProxy.setup(with: navigationController!)
}
}
此解决方案为向前和向后（push 和pop）方向提供动画。
这可以在 LeftToRightTransitionProxy 类的 navigationController(_:animationControllerFor:from:to:) 方法中进行控制（只需返回 nil 以删除动画）。
如果您对UIViewController 的特定子类 需要此行为，请在navigationController(_:animationControllerFor:from:to:) 方法中进行适当的检查：
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if operation == .push && toVC is DetailViewController {
return AnimationController(direction: .forward)
} else if operation == .pop && toVC is ViewController {
return AnimationController(direction: .backward)
}
return nil
}
【讨论】：
这可能对你有帮助
let nextVc = self.storyboard?.instantiateViewController(withIdentifier: "nextVc")
let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromLeft
transition.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
view.window!.layer.add(transition, forKey: kCATransition)
self.navigationController?.pushViewController(nextVc!, animated: false)
【讨论】：
如果您想学习如何进行自定义转换（即从右到左呈现），那么 this 是一个很好的设置教程。
您需要做的关键事情是设置过渡委托、自定义演示控制器和自定义动画控制器。
【讨论】：
我使用Hero 作为解决方案。
import Hero
然后在你要显示新 UIViewController 的地方打开默认动画：
Hero.shared.defaultAnimation = HeroDefaultAnimationType.cover(direction: .right)
同时指定你的 UINavigationController 将使用 Hero 库：
self.navigationController?.hero.isEnabled = true
之后，即使你使用标准的 pushViewController 函数，你也会得到预期的结果：
self.navigationController?.pushViewController(vc, animated: true)
【讨论】：