动画代表不转换为Swift 3.0

Question

我想实现CABasicAnimation并在动画完成时通知UIViewController。从这个资源：

http://www.informit.com/articles/article.aspx?p=1168314&seqNum=2

我知道我可以将viewcontroller指定为动画的委托，并在viewcontroller中覆盖animationDidStop方法。但是当我将以下代码行转换为Swift时：

[animation setDelegate:self];

像这样：

animation.delegate = self //没有setDelegate方法

XCode抱怨：

Cannot assign value of type 'SplashScreenViewController' to type 'CAAnimationDelegate?'

我做错了什么？我错过了什么吗？

Answer 1

您需要确保您的viewController符合CAAnimationDelegate。

class SplashScreenViewController: UIViewController, CAAnimationDelegate {

    // your code, viewDidLoad and what not

    override func viewDidLoad() {
        super.viewDidLoad()

        let animation = CABasicAnimation()
        animation.delegate = self
        // setup your animation

    }

    // MARK: - CAAnimation Delegate Methods
    func animationDidStart(_ anim: CAAnimation) {

    }

    func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {

    }

    // Add any other CAAnimationDelegate Methods you want

}

您还可以使用扩展程序符合委托：

extension SplasScreenViewController: CAAnimationDelegate {
    func animationDidStart(_ anim: CAAnimation) {

    }

    func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {

    }
}