How to set gradient left to right?
let uiview : UIView = UIView.init(frame: CGRect(x: 50, y: 100, width: 100, height: 10))
let gradient = CAGradientLayer()
gradient.frame = uiview.bounds
gradient.colors = [UIColor.whiteColor().CGColor, UIColor.lightGrayColor().CGColor]
gradient.startPoint = CGPoint(x: 0, y: 0.5)
gradient.endPoint = CGPoint(x: 1, y: 0.5)
uiview.layer.insertSublayer(gradient, atIndex: 0)
self.view.addSubview(uiview)
Take a look at CAGradientLayer - Core Animation | Apple Developer Documentation
Try something like:
let radians: CGFloat = CGFloat.pi
let x: CGFloat = 0.0
let y: CGFloat = 0.0
let z: CGFloat = 1.0
gradient.transform = CATransform3DMakeRotation(radians, x, y, z)
Of course, you can play around with the values till you get the exact result you want.
Related
I want make view this Bottom roundedenter image description here
I think this is really close to what you want:
The rectView is your initial view;
You can play with the + 50 of quad curve height to adjust the curve
let rectView = UIView(frame: CGRect(x: 50, y: 100, width: 200, height: 200))
rectView.backgroundColor = .red
view.addSubview(rectView)
let arcBezierPath = UIBezierPath()
arcBezierPath.move(to: CGPoint(x: 0, y: rectView.frame.height))
arcBezierPath.addQuadCurve(to: CGPoint(x: rectView.frame.width, y: rectView.frame.height), controlPoint: CGPoint(x: rectView.frame.width / 2 , y: rectView.frame.height + 50 ))
arcBezierPath.close()
let shapeLayer = CAShapeLayer()
shapeLayer.path = arcBezierPath.cgPath
shapeLayer.fillColor = UIColor.red.cgColor
rectView.layer.insertSublayer(shapeLayer, at: 0)
rectView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
rectView.layer.cornerRadius = 10
rectView.layer.shadowRadius = 3
rectView.layer.shadowColor = UIColor.black.cgColor
rectView.layer.shadowOffset = CGSize(width: 0, height: 0)
rectView.layer.shadowOpacity = 0.25
Maybe, even better:
You can create your view:
let rectView = UIView(frame: CGRect(x: 50, y: 100, width: 200, height: 200))
view.addSubview(rectView)
Extend UIView
extension UIView {
func addBottomArc(ofHeight height: CGFloat, topCornerRadius: CGFloat) {
let arcBezierPath = UIBezierPath()
arcBezierPath.move(to: CGPoint(x: 0, y: frame.height))
arcBezierPath.addQuadCurve(to: CGPoint(x: frame.width, y: frame.height), controlPoint: CGPoint(x: frame.width / 2 , y: frame.height + height ))
arcBezierPath.close()
let shapeLayer = CAShapeLayer()
shapeLayer.path = arcBezierPath.cgPath
shapeLayer.fillColor = UIColor.red.cgColor
layer.insertSublayer(shapeLayer, at: 0)
layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
layer.cornerRadius = topCornerRadius
}
}
So you can set the height and the corner radius like this:
rectView.addBottomArc(ofHeight: 50, topCornerRadius: 15)
and than add the shadow you need to your view:
rectView.layer.shadowRadius = 3
rectView.layer.shadowColor = UIColor.black.cgColor
rectView.layer.shadowOffset = CGSize(width: 0, height: 0)
rectView.layer.shadowOpacity = 0.25
This is my first time asking a question, so pardon me if it not very thorough.
Basically I am trying to apply a gradient layer on top of a UIBezierPath that is drawn as a graph.
Here is my graph:
Here is the gradient layer I am going for:
Here is what I have tried to draw my graph:
let path = quadCurvedPathWithPoints(points: points)
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.strokeColor = UIColor.blue.cgColor
shapeLayer.fillColor = UIColor.white.cgColor
shapeLayer.position = CGPoint(x: 0, y: 0)
shapeLayer.lineWidth = 1.0
This fills the graph with a blue stroke, obviously, but now I am trying to apply the white to green gradient. The way I am doing it is not working. Here is the result:
Here is the code I am struggling with:
let startColor = UIColor.white.withAlphaComponent(0.5)
let endColor = UIColor.green
let gradient = CAGradientLayer()
gradient.colors = [startColor.cgColor, endColor.cgColor]
gradient.startPoint = CGPoint(x: 0.0, y: 0.5)
gradient.endPoint = CGPoint(x: 1.0, y: 0.5)
gradient.frame = path.bounds
let shapeMask = CAShapeLayer()
shapeMask.path = path.cgPath
gradient.mask = shapeLayer
sparkLineView.layer.addSublayer(gradient)
Here's a little demo that draws a UIBezierPath path using a gradient. You can copy this into a Swift playground.
class GradientGraph: UIView {
override func draw(_ rect: CGRect) {
// Create the "graph"
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: frame.height * 0.5))
path.addLine(to: CGPoint(x: frame.width * 0.2, y: frame.height * 0.3))
path.addLine(to: CGPoint(x: frame.width * 0.4, y: frame.height * 0.8))
path.addLine(to: CGPoint(x: frame.width * 0.6, y: frame.height * 0.4))
path.addLine(to: CGPoint(x: frame.width * 0.8, y: frame.height * 0.7))
// Create the gradient
let gradient = CGGradient(colorsSpace: nil, colors: [UIColor.white.cgColor,UIColor.green.cgColor] as CFArray, locations: nil)!
// Draw the graph and apply the gradient
let ctx = UIGraphicsGetCurrentContext()!
ctx.setLineWidth(6)
ctx.saveGState()
ctx.addPath(path.cgPath)
ctx.replacePathWithStrokedPath()
ctx.clip()
ctx.drawLinearGradient(gradient, start: CGPoint(x: 0, y: 0), end: CGPoint(x: frame.width, y: 0), options: [])
ctx.restoreGState()
}
}
let graph = GradientGraph(frame: CGRect(x: 0, y: 0, width: 700, height: 700))
I created simple borderline into my view. However I am struggling giving horizontal gradient background color to it. How should I do it?
I tried like this but it just sets the color to white:
let border = CAGradientLayer()
border.frame = CGRect(x: 0, y: self.mainView.frame.height - 2, width: self.mainView.frame.width, height: 2)
border.backgroundColor = UIColor.gray.cgColor
let color1 = UIColor.black.withAlphaComponent(0.1).cgColor as CGColor
let color2 = UIColor.white.withAlphaComponent(0.9).cgColor as CGColor
border.locations = [0.60, 1.0]// Are these right coordinates?
border.colors = [color2, color1]
I got it working like this:
let gradientLayer = CAGradientLayer()
gradientLayer.frame = CGRect(x: 0, y: self.mainView.frame.height - 2, width: self.mainView.frame.width, height: 2)
gradientLayer.colors = [UIColor.green,UIColor.blue ].map{$0.cgColor}
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
Instead of using CALayer() I had to use CAGradientLayer()
I have a strange question. Even though I did read a lot of tutorials on how to do this, the final result only shows the bezier line, not any shadow whatsoever. My code is pretty simple :
let borderLine = UIBezierPath()
borderLine.moveToPoint(CGPoint(x:0, y: y! - 1))
borderLine.addLineToPoint(CGPoint(x: x!, y: y! - 1))
borderLine.lineWidth = 2
UIColor.blackColor().setStroke()
borderLine.stroke()
let shadowLayer = CAShapeLayer()
shadowLayer.shadowOpacity = 1
shadowLayer.shadowOffset = CGSize(width: 0,height: 1)
shadowLayer.shadowColor = UIColor.redColor().CGColor
shadowLayer.shadowRadius = 1
shadowLayer.masksToBounds = false
shadowLayer.shadowPath = borderLine.CGPath
self.layer.addSublayer(shadowLayer)
What am I doing wrong as I dont seem to see anything wrong but of course I am wrong since no shadow appears. The function is drawRect, basic UIVIew no extra anything in there, x and y are the width and height of the frame. Many thanks in advance!
I take this example straight from my PaintCode-app. Hope this helps.
//// General Declarations
let context = UIGraphicsGetCurrentContext()
//// Shadow Declarations
let shadow = UIColor.blackColor()
let shadowOffset = CGSizeMake(3.1, 3.1)
let shadowBlurRadius: CGFloat = 5
//// Bezier 2 Drawing
var bezier2Path = UIBezierPath()
bezier2Path.moveToPoint(CGPointMake(30.5, 90.5))
bezier2Path.addLineToPoint(CGPointMake(115.5, 90.5))
CGContextSaveGState(context)
CGContextSetShadowWithColor(context, shadowOffset, shadowBlurRadius, (shadow as UIColor).CGColor)
UIColor.blackColor().setStroke()
bezier2Path.lineWidth = 1
bezier2Path.stroke()
CGContextRestoreGState(context)
I prefer the way to add a shadow-sublayer. You can easily use the following function (Swift 3.0):
func createShadowLayer() -> CALayer {
let shadowLayer = CALayer()
shadowLayer.shadowColor = UIColor.red.cgColor
shadowLayer.shadowOffset = CGSize.zero
shadowLayer.shadowRadius = 5.0
shadowLayer.shadowOpacity = 0.8
shadowLayer.backgroundColor = UIColor.clear.cgColor
return shadowLayer
}
And finally, you just add it to your line path (CAShapeLayer):
let line = CAShapeLayer()
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: 0))
path.addLine(to: CGPoint(x: 50, y: 100))
path.addLine(to: CGPoint(x: 100, y: 50))
line.path = path.cgPath
line.strokeColor = UIColor.blue.cgColor
line.fillColor = UIColor.clear.cgColor
line.lineWidth = 2.0
view.layer.addSublayer(line)
let shadowSubLayer = createShadowLayer()
shadowSubLayer.insertSublayer(line, at: 0)
view.layer.addSublayer(shadowSubLayer)
I am using the shadow properties of my shape layer to add shadow to it. The best part of this approach is that I don't have to provide a path explicitly. The shadow follows the path of the layer. I am also animating the layer by changing path. In that case too the shadow animates seamlessly without a single line of code.
Here is what I am doing (Swift 4.2)
shapeLayer.path = curveShapePath(postion: initialPosition)
shapeLayer.strokeColor = UIColor.clear.cgColor
shapeLayer.fillColor = shapeBackgroundColor
self.layer.addSublayer(shapeLayer)
if shadow {
shapeLayer.shadowRadius = 5.0
shapeLayer.shadowColor = UIColor.gray.cgColor
shapeLayer.shadowOpacity = 0.8
}
The curveShapePath method is the one that returns the path and is defined as follows:
func curveShapePath(postion: CGFloat) -> CGPath {
let height: CGFloat = 37.0
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: 0)) // start top left
path.addLine(to: CGPoint(x: (postion - height * 2), y: 0)) // the beginning of the trough
// first curve down
path.addCurve(to: CGPoint(x: postion, y: height),
controlPoint1: CGPoint(x: (postion - 30), y: 0), controlPoint2: CGPoint(x: postion - 35, y: height))
// second curve up
path.addCurve(to: CGPoint(x: (postion + height * 2), y: 0),
controlPoint1: CGPoint(x: postion + 35, y: height), controlPoint2: CGPoint(x: (postion + 30), y: 0))
// complete the rect
path.addLine(to: CGPoint(x: self.frame.width, y: 0))
path.addLine(to: CGPoint(x: self.frame.width, y: self.frame.height))
path.addLine(to: CGPoint(x: 0, y: self.frame.height))
path.close()
return path.cgPath
}
I am able to use the flash feature, access the photo gallery, and use the rear/front camera.
I would like to implement grid lines that display when the user is taking a photo.
Any ideas?
Create a UIImageView to use for the cameraOverlayView.
Assuming you've got a UIImagePickerController named yourImagePickerController and also that you've got an image file named overlay.png as your 'grid lines'. When making your grid line image file, be sure to use a transparent background - not opaque white.
UIImageView *overlayImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"overlay.png"]];
CGRect overlayRect = CGRectMake(0, 0, overlayImage.image.size.width, overlayImage.image.size.height);
[overlayImage setFrame:overlayRect];
[yourImagePickerController setCameraOverlayView:overlayImage];
It's pretty easy with UIBezierPath. This is how you can achieve.
Save this code in a file called GridView.swift.
import Foundation
import UIKit
class GridView: UIView {
override func draw(_ rect: CGRect) {
let firstColumnPath = UIBezierPath()
firstColumnPath.move(to: CGPoint(x: bounds.width / 3, y: 0))
firstColumnPath.addLine(to: CGPoint(x: bounds.width / 3, y: bounds.height))
let firstColumnLayer = gridLayer()
firstColumnLayer.path = firstColumnPath.cgPath
layer.addSublayer(firstColumnLayer)
let secondColumnPath = UIBezierPath()
secondColumnPath.move(to: CGPoint(x: (2 * bounds.width) / 3, y: 0))
secondColumnPath.addLine(to: CGPoint(x: (2 * bounds.width) / 3, y: bounds.height))
let secondColumnLayer = gridLayer()
secondColumnLayer.path = secondColumnPath.cgPath
layer.addSublayer(secondColumnLayer)
let firstRowPath = UIBezierPath()
firstRowPath.move(to: CGPoint(x: 0, y: bounds.height / 3))
firstRowPath.addLine(to: CGPoint(x: bounds.width, y: bounds.height / 3))
let firstRowLayer = gridLayer()
firstRowLayer.path = firstRowPath.cgPath
layer.addSublayer(firstRowLayer)
let secondRowPath = UIBezierPath()
secondRowPath.move(to: CGPoint(x: 0, y: ( 2 * bounds.height) / 3))
secondRowPath.addLine(to: CGPoint(x: bounds.width, y: ( 2 * bounds.height) / 3))
let secondRowLayer = gridLayer()
secondRowLayer.path = secondRowPath.cgPath
layer.addSublayer(secondRowLayer)
}
private func gridLayer() -> CAShapeLayer {
let shapeLayer = CAShapeLayer()
shapeLayer.strokeColor = UIColor(white: 1.0, alpha: 0.3).cgColor
shapeLayer.frame = bounds
shapeLayer.fillColor = nil
return shapeLayer
}
}
Usage:
func addGridView(cameraView: UIView) {
let horizontalMargin = cameraView.bounds.size.width / 4
let verticalMargin = cameraView.bounds.size.height / 4
let gridView = GridView()
gridView.translatesAutoresizingMaskIntoConstraints = false
cameraView.addSubview(gridView)
gridView.backgroundColor = UIColor.clear
gridView.leftAnchor.constraint(equalTo: cameraView.leftAnchor, constant: horizontalMargin).isActive = true
gridView.rightAnchor.constraint(equalTo: cameraView.rightAnchor, constant: -1 * horizontalMargin).isActive = true
gridView.topAnchor.constraint(equalTo: cameraView.topAnchor, constant: verticalMargin).isActive = true
gridView.bottomAnchor.constraint(equalTo: cameraView.bottomAnchor, constant: -1 * verticalMargin).isActive = true
}
As far as the documentation goes it doesn't state whether the grid lines provided by Apple is actually a shared method but as it's not mentioned I'd say not, but you can implement your own with the cameraOverlayView.