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与 ViewController 的 present 转场动画不同
1, 导航控制器,pushViewController 的转场动画,的代理是
navigationController?.delegate = self
2, 指定动画的办法
extension Two: UINavigationControllerDelegate{func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if operation == .push{return navAnimatorPush}
else{return nil}
}
}
具体的动画设置也不同
应用 snapshotView
, 会呈现奇怪的成果
代码很好了解
class NavBaseCustomAnimatorPush: NSObject, UIViewControllerAnimatedTransitioning{func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {return 1}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {guard let fromCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
let toCtrl = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to), let fromView = fromCtrl.view, let toView = toCtrl.view else{return}
let containerView = transitionContext.containerView
let f = UIScreen.main.bounds
fromView.frame = f
containerView.addSubview(fromView)
containerView.addSubview(toView)
toView.frame = presentingDirection.offsetF(withFrame: f)
UIView.animate(withDuration: transitionDuration(using: transitionContext), delay: 0.0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.0, options: .curveLinear) {toView.frame = f} completion: { _ in
let success = !transitionContext.transitionWasCancelled
transitionContext.completeTransition(success)
}
}
}
github repo
正文完