Question

关于我当前应用程序设置的动态背景图像动画，我遇到的一个快速问题。本质上，我想让当前静止的背景图像视图不断向上滚动以开始位置；但我正在努力将它们拼凑在一起。有人可以帮我吗？

 class Flash: UIViewController {
@IBOutlet weak var arrowImage: UIImageView!

    var arrow1: UIImage!
    var arrow2: UIImage!
    var arrow3: UIImage!
    var images: [UIImage]!
    var animatedImage: UIImage!
    override func viewDidLoad() {
        super.viewDidLoad()
        toggleFlash()
        arrow1 = UIImage(named: "Arrow1.png")
        arrow2 = UIImage(named: "Arrow2.png")
        arrow3 = UIImage(named: "Arrow3.png")
        images = [arrow1, arrow2, arrow3]
       animatedImage = UIImage.animatedImage(with: images, duration: 1.0)
        arrowImage.image = animatedImage

    }

    func blinkScreen(){

    UIView.animate(withDuration: 1, delay: 0, options: [.repeat, .curveLinear], animations: {

    }) { _ in
    }
}

Answer 1

好吧，我想我知道你要做什么。

首先，duration参数是动画每次迭代的持续时间。其次，除非将.repeat选项添加到options参数，否则UIView.animate（...）不会重复动画。

因此，要实现更接近所需的目标，请将代码更新为：

func blinkScreen()
    UIView.animate(withDuration: 1, delay: 0, options: [.repeat, .curveLinear], animations: {
        self.imageV.transform = CGAffineTransform(translationX: 0, y: -10)
    }) { _ in
        self.imageV.transform = .identity
    }
}

如果要上下移动动画，请使用.autoreverse选项（也可以使用.curveEaseInOut）：

func blinkScreen()
    UIView.animate(withDuration: 1, delay: 0, options: [.repeat, .autoreverse, .curveEaseInOut], animations: {
        self.imageV.transform = CGAffineTransform(translationX: 0, y: -10)
    }) { _ in
        self.imageV.transform = .identity
    }
}

Swift-为ImageView设置动画

1 个答案: