Swift 创建无限背景从右向左滚动

我正在尝试创建一个动画来创建一个移动对象的幻觉。因此，对象将保持在相同的位置，但比屏幕宽度更宽的背景图像视图将无限移动。我的代码不是很流畅

    let backgroundView = UIView()
    backgroundView.backgroundColor = UIColor.blueColor()
    backgroundView.frame = CGRect(x: 0, y: 120, width: 50, height: 50)
    self.view.addSubview(backgroundView)
    let options = UIViewAnimationOptions.Repeat | UIViewAnimationOptions.CurveLinear

    UIView.animateWithDuration(2.0, delay: 0.0, options: options, animations: {
        backgroundView.frame = CGRect(x: 420, y: 120, width: 50, height: 50)
        }, completion: nil) 

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更新答案：

要像您在评论中提到的那样制作动画，一种方法是为背景图像创建一个无缝模式，并在屏幕上移动它。例如，在屏幕上移动image1，跟随image2，将image1移回原始位置，将image2移回原始位置，然后重复。可能有一种更简单的方法来实现这一点，这取决于您实际使用它的目的，但这只是一个示例。我已经为这个例子做了一个例子，请随意使用它

func animateBackground() {
    let animationOptions = UIViewAnimationOptions.Repeat | UIViewAnimationOptions.CurveLinear
    let backgroundImage = UIImage(named:"backgroundPattern.jpg")!
    var amountToKeepImageSquare = backgroundImage.size.height - self.view.frame.size.height

    // UIImageView 1
    var backgroundImageView1 = UIImageView(image: backgroundImage)
    backgroundImageView1.frame = CGRect(x: self.view.frame.origin.x, y: self.view.frame.origin.y, width: backgroundImage.size.width - amountToKeepImageSquare, height: self.view.frame.size.height)
    self.view.addSubview(backgroundImageView1)

    // UIImageView 2
    var backgroundImageView2 = UIImageView(image: backgroundImage)
    backgroundImageView2.frame = CGRect(x: backgroundImageView1.frame.size.width, y: self.view.frame.origin.y, width: backgroundImage.size.width - amountToKeepImageSquare, height: self.view.frame.height)
    self.view.addSubview(backgroundImageView2)

    // Animate background
    UIView.animateWithDuration(6.0, delay: 0.0, options: animationOptions, animations: {
        backgroundImageView1.frame = CGRectOffset(backgroundImageView1.frame, -1 * backgroundImageView1.frame.size.width, 0.0)
        backgroundImageView2.frame = CGRectOffset(backgroundImageView2.frame, -1 * backgroundImageView2.frame.size.width, 0.0)
        }, completion: nil)

    // Have something in the foreground look like its moving
    var square = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
    square.frame.origin = CGPoint(x: self.view.frame.origin.x + 25, y: self.view.frame.size.height - 75)
    square.backgroundColor = UIColor.darkGrayColor()
    self.view.addSubview(square)

    // Animate foreground
    UIView.animateWithDuration(0.5, delay: 0, options: animationOptions, animations: {
        square.transform = CGAffineTransformMakeRotation(33)
        }, completion: nil)
}

您将得到如下动画：

原始答案：

我不完全确定您想要实现什么，但从我收集的信息来看，您希望视图在重复每个动画时不要跳回起始位置。您可以通过将

ui视图的起点设置在视图的左侧，终点设置在视图的右侧来实现这一点

func animateSquare() {
    // Create our square with size of 50x50
    var square = UIView(frame: CGRect(x: 0, y: self.view.frame.height / 2, width: 50, height: 50))
    // Set its origin just off the left of the screen so it is not visible
    square.frame.origin = CGPoint(x: 0 - square.frame.size.width, y: self.view.frame.height / 2)
    square.backgroundColor = UIColor.blackColor()
    self.view.addSubview(square)

    // Setup animation and repeat
    let animationOptions = UIViewAnimationOptions.Repeat | UIViewAnimationOptions.CurveLinear
    UIView.animateWithDuration(2.0, delay: 0, options: animationOptions, animations: {
        // Offset our square's frame by the width of the view + the width of the square
        // This way it moves off the screen to the right completely
        square.frame = CGRectOffset(square.frame, self.view.frame.width + square.frame.width, 0.0)
        }, completion: nil)
}

您将得到如下动画：

对于Swift 5.0+，请使用以下功能

func animateBackground()
{
    let backgroundImage = UIImage(named:"bgImage")!

    // UIImageView 1
    let backgroundImageView1 = UIImageView(image: backgroundImage)
    backgroundImageView1.frame = CGRect(x: self.view.frame.origin.x, y: self.view.frame.origin.y, width: self.view.frame.size.width, height: self.view.frame.size.height)
    backgroundImageView1.contentMode = .scaleAspectFit
    self.view.addSubview(backgroundImageView1)

    // UIImageView 2
    let backgroundImageView2 = UIImageView(image: backgroundImage)
    backgroundImageView2.frame = CGRect(x: self.view.frame.size.width, y: self.view.frame.origin.y, width: self.view.frame.size.width, height: self.view.frame.height)
    backgroundImageView2.contentMode = .scaleAspectFit
    self.view.addSubview(backgroundImageView2)

    // Animate background
    UIView.animate(withDuration: 6.0, delay: 0.0, options: [.repeat, .curveLinear], animations: {
        backgroundImageView1.frame = backgroundImageView1.frame.offsetBy(dx: -1 * backgroundImageView1.frame.size.width, dy: 0.0)
        backgroundImageView2.frame = backgroundImageView2.frame.offsetBy(dx: -1 * backgroundImageView2.frame.size.width, dy: 0.0)
        }, completion: nil)
}

对不起，我的代码从左向右移动，而不是相反。我正在尝试实现一些动画，如你所见，它是移动背景和前景来创建一些动画。再次感谢您的帮助。@mean老师，我更新了我的答案，为您提供了一个如何实现您在评论中提到的目标的示例。还需要做更多的工作才能使其更加完美，但逻辑是一样的。非常感谢！这对我真的有很大帮助。我想将其用于刷新控件。因此，我会改变大小等，但你的回答真的把我在正确的轨道上。我再次感谢你，先生。