Navigation Controller'da ekranlar o'rtasida o'tish paytida o'z animatsion o'tishni qanday amalga oshirish mumkin?

UINavigationController ichida ekranlar orasida maxsus animatsiya o'tishini amalga oshirish uchun UIViewControllerAnimatedTransitioning va UINavigationControllerDelegate protokollaridan foydalanish kerak.

1. UIViewControllerAnimatedTransitioning protokolini amalga oshiradigan sinf yarating va animatsiya mantiqini quyidagi metodlarda tavsiflang:

   • transitionDuration(using:) — animatsiya davomiyligi
   • animateTransition(using:) — o'zgarishning o'zi

2. UINavigationController delegatini UINavigationControllerDelegate ni amalga oshiradigan ob'ekt bilan belgilang va metodda:

   func navigationController(_ navigationController: UINavigationController, 
                             animationControllerFor operation: UINavigationController.Operation, 
                             from fromVC: UIViewController, 
                             to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
       // sizning animatsiya ob'ektingizni qaytaradi
       return customAnimator
   }
   

Oddiy maxsus animator misoli:

class CustomAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.3
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let toView = transitionContext.view(forKey: .to) else {
            transitionContext.completeTransition(false)
            return
        }
        let container = transitionContext.containerView
        toView.alpha = 0
        container.addSubview(toView)

        UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
            toView.alpha = 1
        }) { finished in
            transitionContext.completeTransition(finished)
        }
    }
}