곡선 경로를 따라 이동하는 보기 또는 이미지를 애니메이션화하려면 어떻게 해야 합니까?

곡선 경로를 따라 이동하는 보기 또는 이미지를 애니메이션화하려면 어떻게 해야 합니까?

저는 커머스 애플리케이션을 개발하고 있습니다.쇼핑 카트에 아이템을 추가할 때 아이템 이미지가 곡선 경로를 따라 카트 탭에 도달하는 효과를 만들고 싶습니다.

이런 곡선을 따라 이미지 애니메이션을 만들려면 어떻게 해야 합니까?

Nikolai가 말한 것을 확장하기 위해, 이를 처리하는 가장 좋은 방법은 Core Animation을 사용하여 베지에 경로를 따라 이미지 또는 보기의 움직임을 애니메이션화하는 것입니다.이 작업은 CAKeyframe Animation을 사용하여 수행됩니다.예를 들어, 다음 코드를 사용하여 저장을 나타내는 아이콘으로 보기 이미지를 애니메이션화했습니다(이 응용 프로그램의 비디오에서 볼 수 있음).

우선 QuartzCore 헤더 파일 가져오기#import <QuartzCore/QuartzCore.h>

UIImageView *imageViewForAnimation = [[UIImageView alloc] initWithImage:imageToAnimate];
imageViewForAnimation.alpha = 1.0f;
CGRect imageFrame = imageViewForAnimation.frame;
//Your image frame.origin from where the animation need to get start
CGPoint viewOrigin = imageViewForAnimation.frame.origin;
viewOrigin.y = viewOrigin.y + imageFrame.size.height / 2.0f;
viewOrigin.x = viewOrigin.x + imageFrame.size.width / 2.0f;

imageViewForAnimation.frame = imageFrame;
imageViewForAnimation.layer.position = viewOrigin;
[self.view addSubview:imageViewForAnimation];

// Set up fade out effect
CABasicAnimation *fadeOutAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[fadeOutAnimation setToValue:[NSNumber numberWithFloat:0.3]];
fadeOutAnimation.fillMode = kCAFillModeForwards;
fadeOutAnimation.removedOnCompletion = NO;

// Set up scaling
CABasicAnimation *resizeAnimation = [CABasicAnimation animationWithKeyPath:@"bounds.size"];
[resizeAnimation setToValue:[NSValue valueWithCGSize:CGSizeMake(40.0f, imageFrame.size.height * (40.0f / imageFrame.size.width))]];
resizeAnimation.fillMode = kCAFillModeForwards;
resizeAnimation.removedOnCompletion = NO;

// Set up path movement
CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
//Setting Endpoint of the animation
CGPoint endPoint = CGPointMake(480.0f - 30.0f, 40.0f);
//to end animation in last tab use 
//CGPoint endPoint = CGPointMake( 320-40.0f, 480.0f);
CGMutablePathRef curvedPath = CGPathCreateMutable();
CGPathMoveToPoint(curvedPath, NULL, viewOrigin.x, viewOrigin.y);
CGPathAddCurveToPoint(curvedPath, NULL, endPoint.x, viewOrigin.y, endPoint.x, viewOrigin.y, endPoint.x, endPoint.y);
pathAnimation.path = curvedPath;
CGPathRelease(curvedPath);

CAAnimationGroup *group = [CAAnimationGroup animation]; 
group.fillMode = kCAFillModeForwards;
group.removedOnCompletion = NO;
[group setAnimations:[NSArray arrayWithObjects:fadeOutAnimation, pathAnimation, resizeAnimation, nil]];
group.duration = 0.7f;
group.delegate = self;
[group setValue:imageViewForAnimation forKey:@"imageViewBeingAnimated"];

[imageViewForAnimation.layer addAnimation:group forKey:@"savingAnimation"];

[imageViewForAnimation release];

다음을 사용하여 CGPath를 따라 애니메이션을 만드는 방법UIView.animateKeyframes(스위프트 4)

private func animateNew() {

   let alphaFrom: CGFloat = 1
   let alphaTo: CGFloat = 0.3
   let sizeFrom = CGSize(width: 40, height: 20)
   let sizeTo = CGSize(width: 80, height: 60)
   let originFrom = CGPoint(x: 40, y: 40)
   let originTo = CGPoint(x: 240, y: 480)

   let deltaWidth = sizeTo.width - sizeFrom.width
   let deltaHeight = sizeTo.height - sizeFrom.height
   let deltaAlpha = alphaTo - alphaFrom

   // Setting default values
   imageViewNew.alpha = alphaFrom
   imageViewNew.frame = CGRect(origin: originFrom, size: sizeFrom)

   // CGPath setup for calculating points on curve.
   let curvedPath = CGMutablePath()
   curvedPath.move(to: originFrom)
   curvedPath.addQuadCurve(to: originTo, control: CGPoint(x: originFrom.x,  y: originTo.y))
   let path = Math.BezierPath(cgPath: curvedPath, approximationIterations: 10)

   // Calculating timing parameters
   let duration: TimeInterval = 0.7
   let numberOfKeyFrames = 16
   let curvePoints = Math.Easing.timing(numberOfSteps: numberOfKeyFrames, .easeOutQuad)

   UIView.animateKeyframes(withDuration: duration, delay: 0, options: [.calculationModeCubic], animations: {
      // Iterating curve points and adding key frames
      for point in curvePoints {
         let origin = path.point(atPercentOfLength: point.end)
         let size = CGSize(width: sizeFrom.width + deltaWidth * point.end,
                           height: sizeFrom.height + deltaHeight * point.end)
         let alpha = alphaFrom + deltaAlpha * point.end
         UIView.addKeyframe(withRelativeStartTime: TimeInterval(point.start), relativeDuration: TimeInterval(point.duration)) {
            self.imageViewNew.frame = CGRect(origin: origin, size: size)
            self.imageViewNew.alpha = alpha
         }
      }
   }, completion: nil)
}

파일:Math.Easing.swift

// Inspired by: RBBAnimation/RBBEasingFunction.m: https://github.com/robb/RBBAnimation/blob/master/RBBAnimation/RBBEasingFunction.m
extension Math { public struct Easing { } }

extension Math.Easing {

   public enum Algorithm: Int {
      case linear, easeInQuad, easeOutQuad, easeInOutQuad
   }

   @inline(__always)
   public static func linear(_ t: CGFloat) -> CGFloat {
      return t
   }

   @inline(__always)
   public static func easeInQuad(_ t: CGFloat) -> CGFloat  {
      return t * t
   }

   @inline(__always)
   public static func easeOutQuad(_ t: CGFloat) -> CGFloat  {
      return t * (2 - t)
   }

   @inline(__always)
   public static func easeInOutQuad(_ t: CGFloat) -> CGFloat  {
      if t < 0.5 {
         return 2 * t * t
      } else {
         return -1 + (4 - 2 * t) * t
      }
   }
}

extension Math.Easing {

   public struct Timing {

      public let start: CGFloat
      public let end: CGFloat
      public let duration: CGFloat

      init(start: CGFloat, end: CGFloat) {
         self.start = start
         self.end = end
         self.duration = end - start
      }

      public func multiplying(by: CGFloat) -> Timing {
         return Timing(start: start * by, end: end * by)
      }
   }

   public static func process(_ t: CGFloat, _ algorithm: Algorithm) -> CGFloat {
      switch algorithm {
      case .linear:
         return linear(t)
      case .easeInQuad:
         return easeInQuad(t)
      case .easeOutQuad:
         return easeOutQuad(t)
      case .easeInOutQuad:
         return easeInOutQuad(t)
      }
   }

   public static func timing(numberOfSteps: Int, _ algorithm: Algorithm) -> [Timing] {
      var result: [Timing] = []
      let linearStepSize = 1 / CGFloat(numberOfSteps)
      for step in (0 ..< numberOfSteps).reversed() {
         let linearValue = CGFloat(step) * linearStepSize
         let processedValue = process(linearValue, algorithm) // Always in range 0 ... 1
         let lastValue = result.last?.start ?? 1
         result.append(Timing(start: processedValue, end: lastValue))
      }
      result = result.reversed()
      return result
   }
}

파일:Math.BezierPath.swift다음 SO 답변을 보십시오: https://stackoverflow.com/a/50782971/1418981

CAKeyframe Animation을 사용하여 UIView의 중심 속성을 애니메이션화할 수 있습니다.코어 애니메이션 프로그래밍 가이드를 참조하십시오.

원래 응답의 ObjC 예와 유사한 Swift 4 버전.

class KeyFrameAnimationsViewController: ViewController {

   let sampleImage = ImageFactory.image(size: CGSize(width: 160, height: 120), fillColor: .blue)

   private lazy var imageView = ImageView(image: sampleImage)
   private lazy var actionButton = Button(title: "Animate").autolayoutView()

   override func setupUI() {
      view.addSubviews(imageView, actionButton)
      view.backgroundColor = .gray
   }

   override func setupLayout() {
      LayoutConstraint.withFormat("|-[*]", actionButton).activate()
      LayoutConstraint.withFormat("V:|-[*]", actionButton).activate()
   }

   override func setupHandlers() {
      actionButton.setTouchUpInsideHandler { [weak self] in
         self?.animate()
      }
   }

   private func animate() {

      imageView.alpha = 1
      let isRemovedOnCompletion = false

      let sizeFrom = CGSize(width: 40, height: 20)
      let sizeTo = CGSize(width: 80, height: 60)
      let originFrom = CGPoint(x: 40, y: 40)
      let originTo = CGPoint(x: 240, y: 480)

      imageView.frame = CGRect(origin: originFrom, size: sizeFrom)
      imageView.layer.position = originFrom

      // Set up fade out effect
      let fadeOutAnimation = CABasicAnimation(keyPath: "opacity")
      fadeOutAnimation.toValue = 0.3
      fadeOutAnimation.fillMode = kCAFillModeForwards
      fadeOutAnimation.isRemovedOnCompletion = isRemovedOnCompletion

      // Set up scaling
      let resizeAnimation = CABasicAnimation(keyPath: "bounds.size")
      resizeAnimation.toValue = sizeTo
      resizeAnimation.fillMode = kCAFillModeForwards
      resizeAnimation.isRemovedOnCompletion = isRemovedOnCompletion

      // Set up path movement
      let pathAnimation = CAKeyframeAnimation(keyPath: "position")
      pathAnimation.calculationMode = kCAAnimationPaced;
      pathAnimation.fillMode = kCAFillModeForwards;
      pathAnimation.isRemovedOnCompletion = isRemovedOnCompletion

      // Setting Endpoint of the animation to end animation in last tab use
      let curvedPath = CGMutablePath()
      curvedPath.move(to: originFrom)
      // About curves: https://www.bignerdranch.com/blog/core-graphics-part-4-a-path-a-path/
      curvedPath.addQuadCurve(to: originTo, control: CGPoint(x: originFrom.x,  y: originTo.y))
      pathAnimation.path = curvedPath

      let group = CAAnimationGroup()
      group.fillMode = kCAFillModeForwards
      group.isRemovedOnCompletion = isRemovedOnCompletion
      group.animations = [fadeOutAnimation, pathAnimation, resizeAnimation]
      group.duration = 0.7
      group.setValue(imageView, forKey: "imageViewBeingAnimated")

      imageView.layer.add(group, forKey: "savingAnimation")
   }
}

언급URL : https://stackoverflow.com/questions/1142727/how-can-i-animate-the-movement-of-a-view-or-image-along-a-curved-path