Swift 动画

Question

我正在尝试制作一个应用程序，其动画设计有多个图像，如框架。我使用 UIImage.animationImages、UIImages.animationDuration 和 UIImage.animationRepeatCount，但这仅在确定的时间内显示具有指定图像列表的动画，但我需要在一个图像中停止很多秒，就像在图像列表的另一个图像中一样。例如，在 Android 中，我们可以选择进行 xml 设置图像和每张图像的持续时间，这就是我在 Swift 中所需要的

Answer 1

例如，您可以像这样创建自定义 UIImageView。

class CustomImageView : UIImageView
{
    var animationDurations : [Float] = []
    private var isAnimating = false
    private var animationCount = 0
    override func startAnimating() {
        if let images = animationImages
        {
            if images.count == countElements(animationDurations)
            {
                animationCount = 0
                isAnimating = true
                self.changeImages(0)
            }
        }
    }

    override func stopAnimating() {
        isAnimating = false
    }

    func changeImages(currentIndex : Int)
    {
        if currentIndex == 0 {
            animationCount += 1
        }
        if animationCount > self.animationRepeatCount && self.animationRepeatCount > 0
        {
            isAnimating = false
        }
        if !isAnimating{
            return
        }
        if let images = animationImages
        {
            let nextIndex = (currentIndex + 1) % images.count
            self.image = images[currentIndex] as? UIImage

            let floatDelay = animationDurations[currentIndex] * Float(NSEC_PER_SEC)
            let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(floatDelay))

            dispatch_after(delay, dispatch_get_main_queue(), { () -> Void in
                self.changeImages(nextIndex)
            })
        }
    }

}

可以这样使用

class ViewController: UIViewController {

    var imageView : CustomImageView!

    override func viewDidLoad() {

        imageView = CustomImageView(frame: CGRectMake(100, 100, 60, 60))
        self.view.addSubview(imageView)
        imageView.animationRepeatCount = 2

        let images : [UIImage] = [UIImage(named: "1.png")!,
                                  UIImage(named: "2.png")!,
                                  UIImage(named: "4.png")!]
        let imageDuration : [Float] = [1.0,2.0,0.6]

        imageView.animationImages = images
        imageView.animationDurations = imageDuration
        imageView.startAnimating()

    }
}