ios - 自定义过渡

Question

我有一个导航 Controller ，在该导航 Controller 内部我有一个主屏幕，从主屏幕我单击一个按钮可以转到另一个屏幕。

但是使用导航 Controller 时的标准显示动画是它从侧面滑动，但我想做的是 View Controller 从屏幕底部向上滑动并在到达时创建一种弹跳动画顶。

Answer 1

任何想使用自定义过渡的人都需要记住 UIViewControllerAnimatedTransitioning 和 UIViewControllerTransitioningDelegate 协议(protocol)。现在在继承自 NSObject

的自定义类中使用 UIViewControllerAnimatedTransitioning

import UIKit
class CustomPushAnimation: NSObject, UIViewControllerAnimatedTransitioning {

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.2
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let containerVw = transitionContext.containerView
        let fromViewController = transitionContext.viewController(forKey: .from)
        let toViewController = transitionContext.viewController(forKey: .to)
        guard let fromVc = fromViewController, let toVc = toViewController else { return }
        let finalFrame = transitionContext.finalFrame(for: toVc)

     //For different animation you can play around this line by changing frame
        toVc.view.frame = finalFrame.offsetBy(dx: 0, dy: finalFrame.size.height/2)
        containerVw.addSubview(toVc.view)
        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            toVc.view.frame = finalFrame
            fromVc.view.alpha = 0.5
        }, completion: {(finished) in
            transitionContext.completeTransition(finished)
            fromVc.view.alpha = 1.0
        })
    }
}

The above method will take care of the animation. After that create the above object and use inside yourViewController class

import UIKit
class YourViewController: UIViewController {
lazy var customPushAnimation: CustomPushAnimation = {
        return CustomPushAnimation()
    }()
func openViewControler() {
}let vc =//Assuming your view controller which you want to open
let navigationController = UINavigationController(rootViewController: vc)
//Set transitioningDelegate to invoke protocol method
 navigationController.transitioningDelegate = self
present(navigationController, animated: true, completion: nil)
}

Note: In order to see the animation. Never set animation flag to false while presenting the ViewController. Otherwise your animation will never work.

最后在YourViewcontroller类中实现UIViewControllerTransitioningDelegate协议(protocol)方法

extension YourViewController: UIViewControllerTransitioningDelegate {
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return customPushAnimation
    }

Whenever you present the viewcontroller above protocol method will called and your animation magic will appear.