如何在圆圈中快速移动图像

任何人都可以向我解释如何创建圆形路径并围绕它移动图像。

我需要的：

let circlePath = UIBezierPath(arcCenter: CGPoint(x: 100,y: 100), radius: CGFloat(20), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true) 

我发现圈子的路径怎么样，但其余我不知道要做什么。 我是iOS开发的新手。

而且，当我打开页面时，我需要开始此操作。

Answer 1

检查这段代码，objectToMove是一个来自storyBoard的UIView进行测试，这里我使用的是你的路径代码，但我增加了更多的半径

 import UIKit class ViewController: UIViewController { @IBOutlet weak var objectToMove: UIView! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func viewDidAppear(animated: Bool) { super.viewDidAppear(animated) let orbit = CAKeyframeAnimation(keyPath: "position") var affineTransform = CGAffineTransformMakeRotation(0.0) affineTransform = CGAffineTransformRotate(affineTransform, CGFloat(M_PI)) let circlePath = UIBezierPath(arcCenter: CGPoint(x: 100 - (100/2),y: 100 - (100/2)), radius: CGFloat(100), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true) orbit.path = circlePath.CGPath orbit.duration = 4 orbit.additive = true orbit.repeatCount = 100 orbit.calculationMode = kCAAnimationPaced orbit.rotationMode = kCAAnimationRotateAuto objectToMove.layer .addAnimation(orbit, forKey: "orbit") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } 

我希望这可以帮助你，问候