先放代码，我这边用展示页面高度的一半做示例： 先把需要配置的动画配好
class HalfHeightPresentationController : UIPresentationController{
override var shouldRemovePresentersView: Bool {
return false
}
override func containerViewWillLayoutSubviews() {
super.containerViewWillLayoutSubviews()
containerView?.backgroundColor = UIColor(hexString: "#000000")!.withAlphaComponent(0.5)
presentedView?.frame = CGRect(x: 0, y: containerView!.bounds.height / 2, width: containerView!.bounds.width,height: containerView!.bounds.height / 2)
}
}
class HalfHeightAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
var isPresenting: Bool
init(isPresenting: Bool) {
self.isPresenting = isPresenting
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
if isPresenting {
presentAnimation(transitionContext: transitionContext)
} else {
dismissAnimation(transitionContext: transitionContext)
}
}
private func presentAnimation(transitionContext: UIViewControllerContextTransitioning) {
// 获取目标视图
if let toView = transitionContext.view(forKey: .to) {
// 添加视图到上下文视图
transitionContext.containerView.addSubview(toView)
// 设置初始状态
toView.frame = transitionContext.containerView.bounds
toView.transform = CGAffineTransform(translationX: 0, y: transitionContext.containerView.bounds.height / 2)
// 动画
UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
toView.transform = CGAffineTransform.identity
}, completion: { _ **in**
transitionContext.completeTransition(**true**)
})
}
}
private func dismissAnimation(transitionContext: UIViewControllerContextTransitioning) {
// 获取视图
if let fromView = transitionContext.view(forKey: .from) {
UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
fromView.transform = CGAffineTransform(translationX: 0, y: transitionContext.containerView.bounds.height / 2)
}, completion: { _ in
fromView.removeFromSuperview() transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
}
}
然后在主页面实现自定义的present方法与相关的代理方法
func presentViewControllerWithHalfHeight(viewController: UIViewController) {
// 设置转场动画的 present 过程
viewController.modalPresentationStyle = .custom
viewController.transitioningDelegate = self
// 执行 present 操作
present(viewController, animated: true, completion: nil)
}
func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
return HalfHeightPresentationController(presentedViewController: presented, presenting: presenting)
}
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return* HalfHeightAnimationController(isPresenting: true)
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return HalfHeightAnimationController(isPresenting: false)
}
最后使用自定义present方法唤起页面就行
