ios - 如何对项目内不同组的多个图像进行动画处理？

Question

大家。我的项目中有两个小组。让它们被称为“images1”和“images2”。我想对第一组中的所有图像进行动画处理，然后立即对 ViewController 中的第二组中的所有图像进行动画处理。首先，我创建图像数组，然后使用 UIView.animateKeyFrames 函数。不幸的是，我只能为第一组设置动画，当我尝试添加另一个关键帧来为另一组设置动画时，似乎没有任何效果。我还尝试将另一个关键帧放在“完成”所在的位置，但这会导致错误。我的代码:

import UIKit

class ViewController: UIViewController
{

    var one: [UIImage] = []
    var two: [UIImage] = []



override func viewDidLoad()
{
    super.viewDidLoad()

    one = createImageArray(total: 20, imagePrefix: "images1")
    two = createImageArray(total: 20, imagePrefix: "images2")

    UIView.animateKeyframes(withDuration: 3.0, delay: 0.0, options: [], animations: {
        UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 3, animations: {
            self.animatingImage.animationImages = self.one
            self.animatingImage.animationDuration = 2
            self.animatingImage.startAnimating()
        })

        UIView.addKeyframe(withRelativeStartTime: 0.0, relativeDuration: 3, animations: {
            self.animatingImage.animationImages = self.two
            self.animatingImage.animationDuration = 2
            self.animatingImage.startAnimating()
        })

    }, completion:{ _ in
        print("end")
    })
}

override func didReceiveMemoryWarning()
{
    super.didReceiveMemoryWarning()
}

func createImageArray(total: Int, imagePrefix: String) -> [UIImage]
{
    var imageArray: [UIImage] = []

    for imageCount in 1...total
    {
        let imageName = "\(imagePrefix)\(imageCount).jpg"
        let image = UIImage(named: "\(imageName)")!
        imageArray.append(image)
    }

    return imageArray
}


@IBOutlet weak var animatingImage: UIImageView!

}

Answer 1

您可以将DispatchQueue.main.asyncAfter与UIImage.animatedImage(with

一起使用

你可以这样使用它:

self.animatingImage = UIImage.animatedImage(with: one, duration: 1)

      // animate after 1 sec 
DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
     self.animatingImage = UIImage.animatedImage(with: two, duration: 1)
}