ios - Swift:UIView.transitionWithView 完成 block 问题

Question

我正在尝试使用以下代码让我的 UIImageView (self.posterImageview) 在一组带有动画的 UIImage 中循环:

 func animatePoster (imageArray: [UIImage], count: Int = 0)
{
            UIView.transitionWithView
            (
                self.posterImageview,
                duration: 2,
                options: UIViewAnimationOptions.TransitionFlipFromBottom,
                animations:
                {
                    self.posterImageview.image = imageArray[count]
                },
                completion: 
                {
                    finished in
                    if (count == imageArray.count - 1)  // Last image
                    {
                        self.animatePoster(imageArray)
                    }
                    else
                    {
                    self.animatePoster(imageArray, count: count + 1)
                    }
                }
            )

}

然而，完成 block 似乎并没有像我想象的那样工作。现在，它在所有图像中反复闪烁，不允许在移动到下一个之前播放完整的动画。增加动画的持续时间没有帮助，当我对递归设置限制时(例如，当我到达最终图像时结束)，然后所有图像都会快速循环，除了最后一个，它正确地动画。

任何见解都值得赞赏。

Answer 1

我对 show animation 做了一些不同的改动。请检查它是否对您有帮助。

现在我已经添加了虚拟代码。

override func viewDidLoad() {
        super.viewDidLoad()

        self.arrimages = NSArray (arrayLiteral: UIImage(named: "1.png")!,UIImage(named: "2.png")!,UIImage(named: "3.png")!,UIImage(named: "4.png")!)

        print("Images array = \(self.arrimages)")

        self.posterImageview.image = UIImage(named: "1.png")!
        self.animatePoster(self.arrimages as! [UIImage], count: 1)

    }


    func animatePoster (imageArray: [UIImage], count: Int = 0){

        print("count value = \(count)")

        UIView.transitionWithView(self.posterImageview, duration: 5, options: UIViewAnimationOptions.TransitionFlipFromBottom, animations: {

            }, completion: { (finished: Bool) -> () in

                let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(2 * Double(NSEC_PER_SEC)))

                dispatch_after(delayTime, dispatch_get_main_queue()) {
                    self.posterImageview.image = imageArray[count]
                }


                if (count == (imageArray.count - 1))  // Last image
                {
                    let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(4 * Double(NSEC_PER_SEC)))

                    dispatch_after(delayTime, dispatch_get_main_queue()) {
                        self.animatePoster(imageArray)
                    }
                }
                else
                {
                    let delayTime = dispatch_time(DISPATCH_TIME_NOW, Int64(4 * Double(NSEC_PER_SEC)))

                    dispatch_after(delayTime, dispatch_get_main_queue()) {
                        self.animatePoster(imageArray, count: count + 1)
                    }
                }
        })

    }