Question

以下是每5秒钟在不同图像之间自动转换的代码。我想在转场中添加动画，即淡入淡出，从左侧滚动等等。我将如何在Swift中执行此操作？感谢。

class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

    imageView.animationImages = [
        UIImage(named: "brooklyn-bridge.jpg")!,
        UIImage(named: "grand-central-terminal.jpg")!,
        UIImage(named: "new-york-city.jpg")!,
        UIImage(named: "one-world-trade-center.jpg")!,
        UIImage(named: "rain.jpg")!,
        UIImage(named: "wall-street.jpg")!]

    imageView.animationDuration = 25.0
    imageView.startAnimating()
}

Answer 1

class ViewController: UIViewController {
        @IBOutlet weak var imageView: UIImageView!

        let images = [
                UIImage(named: "brooklyn-bridge.jpg")!,
                UIImage(named: "grand-central-terminal.jpg")!,
                UIImage(named: "new-york-city.jpg"),
                UIImage(named: "one-world-trade-center.jpg")!,
                UIImage(named: "rain.jpg")!,
                UIImage(named: "wall-street.jpg")!]
        var index = 0
        let animationDuration: NSTimeInterval = 0.25
        let switchingInterval: NSTimeInterval = 3

        override func viewDidLoad() {
                super.viewDidLoad()

                imageView.image = images[index++]
                animateImageView()
        }

        func animateImageView() {
                CATransaction.begin()

                CATransaction.setAnimationDuration(animationDuration)
                CATransaction.setCompletionBlock {
                        let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(self.switchingInterval * NSTimeInterval(NSEC_PER_SEC)))
                        dispatch_after(delay, dispatch_get_main_queue()) {
                                self.animateImageView()
                        }
                }

                let transition = CATransition()
                transition.type = kCATransitionFade
                /*
                transition.type = kCATransitionPush
                transition.subtype = kCATransitionFromRight
                */
                imageView.layer.addAnimation(transition, forKey: kCATransition)
                imageView.image = images[index]

                CATransaction.commit()

                index = index < images.count - 1 ? index + 1 : 0
        }
}

将其实现为自定义图像视图会更好。

Answer 2

基于this answer的动画代码，在 Swift 3

中

let animationDuration: TimeInterval = 0.25
let switchingInterval: TimeInterval = 3
func animateImageView()
{
    CATransaction.begin()

    CATransaction.setAnimationDuration(animationDuration)
    CATransaction.setCompletionBlock {
        DispatchQueue.main.asyncAfter(deadline: .now() + self.switchingInterval) {
            self.animateImageView()
        }
    }

    let transition = CATransition()
    transition.type = kCATransitionFade
    /*
     transition.type = kCATransitionPush
     transition.subtype = kCATransitionFromRight
     */
    imageView.layer.add(transition, forKey: kCATransition)
    imageView.image = images.object(at: index) as! UIImage

    CATransaction.commit()

    index = index < images.count - 1 ? index + 1 : 0
}

Answer 3

这是一个独立的类，可用于使用淡入淡出动画为图像更改设置动画。

class FadeImageView: UIImageView
{    
    @IBInspectable
    var fadeDuration: Double = 0.13

    override var image: UIImage? 
    {
        get {
            return super.image
        }
        set(newImage) 
        {
            if let img = newImage 
            {
                CATransaction.begin()
                CATransaction.setAnimationDuration(self.fadeDuration)

                let transition = CATransition()
                transition.type = kCATransitionFade

                super.layer.add(transition, forKey: kCATransition)
                super.image = img

                CATransaction.commit()
            } 
            else {
                super.image = nil
            }
        }
    } 
}

在Swift中添加图像过渡动画

3 个答案: