使用 Swift、UIKit 连续循环动画背景图像

Question

我想为下面的背景图像制作动画，当它向下移动时它应该再次上升。我只想为一张图片制作动画。当我运行代码时，不知何故图像不可见。图片尺寸如下宽：375，高：666

这是图片

这是代码

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var myView: UIView!
var water:UIImageView!

var hover:CABasicAnimation!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    water = UIImageView(image: UIImage(named: "water"))
    water.frame = CGRect(x: 0, y: 0, width: 375.0, height: 666.0)

    water.contentMode = .scaleAspectFill

    UIView.animate(withDuration: 4.0, delay: 0, options: UIViewAnimationOptions.curveLinear, animations: {
        self.water.frame.origin.y = self.view.bounds.height + self.water.frame.height - 50

    }, completion: nil)

    self.view.insertSubview(water, aboveSubview: myView)





}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Answer 1

您可以在动画中使用 [.repeat, .autoreverse] 个选项

UIView.animate(withDuration: 4.0, delay: 0, options: [.repeat, .autoreverse, .curveLinear], animations: {
    self.water.frame.origin.y = self.view.bounds.height + self.water.frame.height - 50

}, completion: nil)

希望对您有所帮助。 :)

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