【发布时间】：2015-10-27 04:03:32
【问题描述】：
更新到正确的版本，既然得到了答案。
我想在导航视图控制器弹出/push时做淡入/淡出动画，然后我实现BaseViewController：
class BaseViewController: UIViewController, UINavigationControllerDelegate {
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.delegate = self
}
func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if (operation == UINavigationControllerOperation.Push) {
return FadeInAnimator()
}
if (operation == UINavigationControllerOperation.Pop) {
return FadeOutAnimator()
}
return nil;
}
}
和FadeInAnimator、FadeOutAnimator：
class FadeInAnimator: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return 0.5
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)
transitionContext.containerView()?.addSubview(toViewController!.view)
toViewController?.view.alpha = 0.0
UIView.animateWithDuration(self.transitionDuration(transitionContext), animations: { () -> Void in
toViewController?.view.alpha = 1.0
}) { (finished) -> Void in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
}
}
}
class FadeOutAnimator: NSObject, UIViewControllerAnimatedTransitioning {
func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
return 0.5
}
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)
let fromViewController = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)
transitionContext.containerView()?.insertSubview((toViewController?.view)!, belowSubview: (fromViewController?.view)!)
UIView.animateWithDuration(self.transitionDuration(transitionContext), animations: { () -> Void in
fromViewController?.view.alpha = 0.0
}) { (finished) -> Void in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
}
}
然后，我添加 2 个视图控制器并嵌入导航视图控制器，ViewControllerA 和 ViewControllerB：
class ViewControllerA: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func pressButton(sender: UIButton) {
if let vc = create(ViewControllerB) {
self.navigationController?.pushViewController(vc, animated: true)
}
}
}
class ViewControllerB: BaseViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
按ViewControllerA 上的按钮将创建并跳转到ViewControllerB，然后按ViewControllerB 上的导航栏项目“返回”将返回到ViewControllerA。
但它不起作用，当按下按钮时，ViewControllerA 显示ViewControllerB，然后再次显示ViewControllerA。
有什么建议吗？我的 xcode 是 7.1，在 iPad Air 2 模拟器上运行。
【问题讨论】：
标签： ios swift uinavigationcontroller