I have an image of a blue circle and I want to make it continuously loop in an elliptical path. I created a circle path first, and it was successful, but creating a oval path loops the circle but stops momentarily before it loops again. Is there something I am missing to make the oval path loop without the hesitation. Here is the code for both loops.
func performRotation(){
let path = UIBezierPath(ovalInRect: CGRectMake(50, 50, 220, 100))
let anim = CAKeyframeAnimation(keyPath: "position")
anim.path = path.CGPath
anim.rotationMode = kCAAnimationLinear
anim.repeatCount = Float.infinity
anim.duration = 5.0
//#IBOutlet weak var ball: UIImageView!
ball.layer.addAnimation(anim, forKey: "animate position along path")
//this is the circle path that loops without the stutter
// let ovalStartAngle = CGFloat(90.01 * M_PI/180)
// let ovalEndAngle = CGFloat(90 * M_PI/180)
// let ovalRect = CGRectMake(97.5, 58.5, 125, 125)
//let path = UIBezierPath()
//path.moveToPoint(CGPoint(x: 200, y: 150))
//path.addArcWithCenter(CGPointMake(CGRectGetMidX(ovalRect), CGRectGetMidY(ovalRect)),
//radius: CGRectGetWidth(ovalRect) / 2,
//startAngle: ovalStartAngle,
//endAngle: ovalEndAngle, clockwise: true)
//let anim = CAKeyframeAnimation(keyPath: "position")
//anim.path = path.CGPath
//anim.rotationMode = kCAAnimationLinear
//anim.repeatCount = Float.infinity
//anim.duration = 5.0
//ball.layer.addAnimation(anim, forKey: "animate position along path")
}
Instead of setting the rotationMode, try setting the calculationMode,
anim.calculationMode = kCAAnimationPaced
Related
Here is my code to draw dashed line
func drawLine() {
let shapeLayer = CAShapeLayer()
shapeLayer.bounds = viewDraw.bounds
shapeLayer.position = CGPoint(x: viewDraw.bounds.width/2, y: viewDraw.bounds.height/2)
shapeLayer.fillColor = nil
shapeLayer.strokeColor = ColorConstants.ThemeColor.cgColor
shapeLayer.lineWidth = 3
shapeLayer.lineJoin = CAShapeLayerLineJoin.round // Updated in swift 4.2
shapeLayer.lineDashPattern = [10]
let path = UIBezierPath(roundedRect: viewDraw.bounds, cornerRadius: viewDraw.bounds.size.height/2)
shapeLayer.path = path.cgPath
viewDraw.layer.addSublayer(shapeLayer)
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.fromValue = 0
animation.duration = 1
shapeLayer.add(animation, forKey: "MyAnimation")
}
Now as per my screenshot I want to animate blue dot to red dot within that dashed line infinite time. When blue dot reaches red dot then it will start again with blue dot points.
Note: This whole screen is dynamic so, Line draw is also dynamic according to screen height
Any help would be appreciated
You are almost there
Now you have to add animation using CAKeyframeAnimation which has property path where you can pass the path where you want to animate
here is working sample code
func drawLine() {
let shapeLayer = CAShapeLayer()
shapeLayer.bounds = self.view.bounds
shapeLayer.position = CGPoint(x: self.view.bounds.width/2, y: self.view.bounds.height/2)
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.red.cgColor
shapeLayer.lineWidth = 3
shapeLayer.lineJoin = CAShapeLayerLineJoin.round // Updated in swift 4.2
shapeLayer.lineDashPattern = [10]
let path = UIBezierPath(roundedRect: self.view.bounds, cornerRadius: self.view.bounds.size.height/2)
shapeLayer.path = path.cgPath
self.view.layer.addSublayer(shapeLayer)
let animation1 = CABasicAnimation(keyPath: "strokeEnd")
animation1.fromValue = 0
animation1.duration = 1
shapeLayer.add(animation1, forKey: "MyAnimation")
// Create squareView and add animation
let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.position))
animation.duration = 1
animation.repeatCount = MAXFLOAT
animation.path = path.cgPath
let squareView = UIView()
// Don't worry about x,y and width and height it will not affect the animation
squareView.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
squareView.backgroundColor = .lightGray
view.addSubview(squareView)
// You can also pass any unique string value for key
squareView.layer.add(animation, forKey: nil)
}
You can see this tutorial for more help http://mathewsanders.com/animations-in-swift-part-two/
I have been trying to do this animation for a couple of days now. I am trying to animate the size of my mask, basically taking a large circle (mask) and shrinking it.
#IBOutlet weak var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
animateMask()
}
func presentMaskScreenWithAnimation () {
//Setup Mask Layer
let bounds = myView.bounds
let maskLayer = CAShapeLayer()
maskLayer.frame = bounds
maskLayer.fillColor = UIColor.brown.cgColor
//CropCircle Out of mask Layer
let initialCircle = CGRect(x: 10, y: 10, width: 300, height: 300)
let path = UIBezierPath(roundedRect: initialCircle, cornerRadius: initialCircle.size.width/2)
path.append(UIBezierPath(rect: bounds))
maskLayer.path = path.cgPath
maskLayer.fillRule = kCAFillRuleEvenOdd
myView.layer.mask = maskLayer
//Define new circle path
let circlePath2 = CGRect(x: 50, y: 50, width: 100, height: 100)
let path2 = UIBezierPath(roundedRect: circlePath2, cornerRadius: circlePath2.size.width/2)
//Create animation
let anim = CABasicAnimation(keyPath: "path")
anim.fromValue = path.cgPath
anim.toValue = path2.cgPath
anim.duration = 3.0
anim.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
maskLayer.add(anim, forKey: nil)
}
This code sets up the mask and begins to animate it however it inverts the entire maskLayer, I am trying to just animate the path of the circle, Large -> Small
Start
Finished
Add path2.append(UIBezierPath(rect: bounds)) after let path2 = UIBezierPath(roundedRect: circlePath2, cornerRadius: circlePath2.size.width/2). Also do not forget to do maskLayer.path = path2.cgPath at the end, if you want the shrinking mask stays after animation.
I want to animate along a bezierPath counter-clockwise.
At the moment the code below only allows me to do it clockwise.
let arrowHead = UIImageView()
arrowHead.image = UIImage(named: "arrowHead.png")
arrowHead.frame = CGRect(x: 55, y: 300, width: 12, height: 12)
let ovalPath = UIBezierPath(ovalInRect: CGRectMake(50, 240, 320, 240))
let ovalShapeLayer = CAShapeLayer()
ovalShapeLayer.fillColor = UIColor.clearColor().CGColor
ovalShapeLayer.strokeColor = UIColor.lightGrayColor().CGColor
ovalShapeLayer.lineWidth = 1.5
ovalShapeLayer.path = ovalPath.CGPath
self.view.layer.addSublayer(ovalShapeLayer)
let myKeyFrameAnimation = CAKeyframeAnimation(keyPath: "position")
myKeyFrameAnimation.path = ovalPath.CGPath
myKeyFrameAnimation.rotationMode = kCAAnimationRotateAuto
myKeyFrameAnimation.repeatCount = Float.infinity
myKeyFrameAnimation.duration = 6.0
// add the animation
arrowHead.layer.addAnimation(myKeyFrameAnimation, forKey: "animate position along path")
self.view.addSubview(arrowHead)
any ideas?
Ok got it.
myKeyFrameAnimation.speed = -1
Was very simple...
At alternative solution is to use bezierPathWithArcCenter... as documented here which allows you to specify the direction of the circle. Using -M_PI_2 as the start angle and 3 * M_PI_2 as the end angle will give a circle beginning and ending at the top.
I made an animation, but I want to put it in a UIImageView so that I can move it around, clear it or restart it.
This is my code:
#IBOutlet var circle: UIImageView!
// I want to make this inside the circle UIImageView or something like that.
let ovalStartAngle = CGFloat(90.01 * M_PI/180)
let ovalEndAngle = CGFloat(90 * M_PI/180)
let ovalRect = CGRectMake(97.5, 230, 125, 125)
let ovalPath = UIBezierPath()
ovalPath.addArcWithCenter(CGPointMake(CGRectGetMidX(ovalRect), CGRectGetMidY(ovalRect)),
radius: CGRectGetWidth(ovalRect) / 2,
startAngle: ovalStartAngle,
endAngle: ovalEndAngle, clockwise: true)
let progressLine = CAShapeLayer()
progressLine.path = ovalPath.CGPath
progressLine.strokeColor = UIColor.blueColor().CGColor
progressLine.fillColor = UIColor.clearColor().CGColor
progressLine.lineWidth = 10.0
progressLine.lineCap = kCALineCapRound
self.view.layer.addSublayer(progressLine)
let animateStrokeEnd = CABasicAnimation(keyPath: "strokeEnd")
animateStrokeEnd.duration = 10.0
animateStrokeEnd.fromValue = 0.0
animateStrokeEnd.toValue = 1.0
progressLine.addAnimation(animateStrokeEnd, forKey: "animate stroke end animation")
On the following image, the blue circle is only for debug purpose. My goal is that every layer behind the blue circle should be transparent.I only want to keep visible what's outside the blue circle.
Here is the code written in swift :
let croissantView = UIView(frame: CGRectMake(100, 100, 100, 100))
croissantView.backgroundColor = UIColor.clearColor()
self.view.addSubview(croissantView)
let radius = 50 as CGFloat
let width = 50 as CGFloat
let origin = CGPointMake(0, 100)
let end = CGPointMake(100,100)
let highAmplitude = CGPointMake(50,180)
let lowAmplitude = CGPointMake(50,150)
let quad = UIBezierPath()
quad.moveToPoint(origin)
quad.addQuadCurveToPoint(end, controlPoint: highAmplitude)
quad.closePath()
let quad2 = UIBezierPath()
quad2.moveToPoint(origin)
quad2.addQuadCurveToPoint(end, controlPoint: lowAmplitude)
quad2.closePath()
let layer = CAShapeLayer()
layer.path = quad.CGPath
layer.strokeColor = UIColor.greenColor().CGColor
layer.fillColor = UIColor.blackColor().CGColor
croissantView.layer.addSublayer(layer)
let anim = CABasicAnimation(keyPath: "path")
anim.duration = 3
anim.repeatCount = 20
anim.fromValue = quad.CGPath
anim.toValue = quad2.CGPath
anim.autoreverses = true
layer.addAnimation(anim, forKey: "animQuad")
let animRotate = CABasicAnimation(keyPath: "transform.rotation")
animRotate.duration = 5
animRotate.repeatCount = 20
animRotate.fromValue = 0
animRotate.toValue = 360 * CGFloat(M_PI) / 180
croissantView.layer.addAnimation(animRotate, forKey: "animRotate")
let circle = UIBezierPath(arcCenter: croissantView.center, radius: 75, startAngle: 0, endAngle: 360 * CGFloat(M_PI) / 180, clockwise: true);
let circleLayer = CAShapeLayer()
circleLayer.path = circle.CGPath
circleLayer.fillColor = UIColor.blueColor().CGColor
circleLayer.opacity = 0.6
self.view.layer.addSublayer(circleLayer)
Thoughts
Substract from Layer, don't know if feasible
Blend, don't know how to do it with CALayer
Thanks !! :)
There are three things I would suggest.
Change your croissant view to a layer (not sure this was necessary, but this is what I did)
Create a CGPath for your circle shape that can have its mask inverted. You do this by wrapping an outer rect around your circle so that the path looks like this:
Set your fill rule on your circle shape layer to even-odd:
circleLayer.fillRule = kCAFillRuleEvenOdd
This is what it looks like:
I adapted your code to attempt it and this is what I came up with. Your mileage may vary:
func applyMask() {
let mainLayer = CALayer()
mainLayer.bounds = CGRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0)
mainLayer.position = CGPoint(x: 200.0, y: 200.0)
// Set the color for debugging
mainLayer.backgroundColor = UIColor.orangeColor().CGColor
self.view.layer.addSublayer(mainLayer)
let radius = 50 as CGFloat
let width = 50 as CGFloat
let origin = CGPointMake(0, 100)
let end = CGPointMake(100,100)
let highAmplitude = CGPointMake(50,180)
let lowAmplitude = CGPointMake(50,150)
let quad = UIBezierPath()
quad.moveToPoint(origin)
quad.addQuadCurveToPoint(end, controlPoint: highAmplitude)
quad.closePath()
let quad2 = UIBezierPath()
quad2.moveToPoint(origin)
quad2.addQuadCurveToPoint(end, controlPoint: lowAmplitude)
quad2.closePath()
let layer = CAShapeLayer()
layer.path = quad.CGPath
layer.strokeColor = UIColor.greenColor().CGColor
layer.fillColor = UIColor.blackColor().CGColor
mainLayer.addSublayer(layer)
let anim = CABasicAnimation(keyPath: "path")
anim.duration = 3
anim.repeatCount = 20
anim.fromValue = quad.CGPath
anim.toValue = quad2.CGPath
anim.autoreverses = true
layer.addAnimation(anim, forKey: "animQuad")
let animRotate = CABasicAnimation(keyPath: "transform.rotation")
animRotate.duration = 5
animRotate.repeatCount = 20
animRotate.fromValue = 0
animRotate.toValue = 360 * CGFloat(M_PI) / 180
mainLayer.addAnimation(animRotate, forKey: "animRotate")
// Build a Circle CGPath
var circlePath = CGPathCreateMutable()
CGPathAddEllipseInRect(circlePath, nil, CGRectInset(mainLayer.bounds, -20.0, -20.0))
// Invert the mask by adding a bounding rectangle
CGPathAddRect(circlePath, nil, CGRectInset(mainLayer.bounds, -100.0, -100.0))
CGPathCloseSubpath(circlePath)
let circleLayer = CAShapeLayer()
circleLayer.fillColor = UIColor.blueColor().CGColor
circleLayer.opacity = 0.6
// Use the even odd fill rule so that our path gets inverted
circleLayer.fillRule = kCAFillRuleEvenOdd
circleLayer.path = circlePath
mainLayer.mask = circleLayer
mainLayer.addSublayer(layer)
}
Here's the project where I tried it out: https://github.com/perlmunger/SwiftVertedMask
Hope that helps.