Swift UITableView zigzag borders - ios

Question

I am trying to achieve this aspect for an UITableView : https://www.dropbox.com/s/bcp86myyjgek1kt/Screenshot%202016-11-04%2014.04.14.png?dl=0 and I am stuck.
I followed Atul Manwar's answer :
func applyZigZagEffect(givenView: UIView) {
let width = givenView.frame.size.width
let height = givenView.frame.size.height
let givenFrame = givenView.frame
let zigZagWidth = CGFloat(7)
let zigZagHeight = CGFloat(5)
let yInitial = height-zigZagHeight
var zigZagPath = UIBezierPath()
zigZagPath.moveToPoint(CGPointMake(0, 0))
zigZagPath.addLineToPoint(CGPointMake(0, yInitial))
var slope = -1
var x = CGFloat(0)
var i = 0
while x < width {
x = zigZagWidth * CGFloat(i)
let p = zigZagHeight * CGFloat(slope)
let y = yInitial + p
let point = CGPointMake(x, y)
zigZagPath.addLineToPoint(point)
slope = slope*(-1)
i++
}
zigZagPath.addLineToPoint(CGPointMake(width, 0))
var shapeLayer = CAShapeLayer()
shapeLayer.path = zigZagPath.CGPath
givenView.layer.mask = shapeLayer
}
The result is not the one I am looking for, because I only obtain the bottom border: Achieved using Atul's answer and I have no clue how to change it for both borders ( bottom and top ).
Tried with images, but is not scaled correctly, and I find this solution better, but I am not able to produce the effect for top border.
Thanks!

Answer 1

I had been working on your question and this are my results, use this code,
func applyZigZagEffect(givenView: UIView) {
let width = givenView.frame.size.width
let height = givenView.frame.size.height
let givenFrame = givenView.frame
let zigZagWidth = CGFloat(7)
let zigZagHeight = CGFloat(5)
var yInitial = height-zigZagHeight
var zigZagPath = UIBezierPath(rect: givenFrame)
zigZagPath.move(to: CGPoint(x:0, y:0))
zigZagPath.addLine(to: CGPoint(x:0, y:yInitial))
var slope = -1
var x = CGFloat(0)
var i = 0
while x < width {
x = zigZagWidth * CGFloat(i)
let p = zigZagHeight * CGFloat(slope)
let y = yInitial + p
let point = CGPoint(x: x, y: y)
zigZagPath.addLine(to: point)
slope = slope*(-1)
i += 1
}
zigZagPath.addLine(to: CGPoint(x:width,y: 0))
yInitial = 0 + zigZagHeight
x = CGFloat(width)
i = 0
while x > 0 {
x = width - (zigZagWidth * CGFloat(i))
let p = zigZagHeight * CGFloat(slope)
let y = yInitial + p
let point = CGPoint(x: x, y: y)
zigZagPath.addLine(to: point)
slope = slope*(-1)
i += 1
}
var shapeLayer = CAShapeLayer()
shapeLayer.path = zigZagPath.cgPath
givenView.layer.mask = shapeLayer
}
I hope this helps you, this code works and was tested
Edited
With this method you can get curved zigzag instead of lines
class func pathSemiCirclesPathForView(givenView: UIView, ciclesRadius:CGFloat = 4, circlesDistance : CGFloat = 3, top:Bool = true, bottom:Bool = true ) ->UIBezierPath
{
let width = givenView.frame.size.width
let height = givenView.frame.size.height
let semiCircleWidth = CGFloat(ciclesRadius*2)
let semiCirclesPath = UIBezierPath()
semiCirclesPath.move(to: CGPoint(x:0, y:0))
if(bottom) {
var x = CGFloat(0)
var i = 0
while x < width {
x = (semiCircleWidth) * CGFloat(i) + (circlesDistance * CGFloat(i))
let pivotPoint = CGPoint(x: x + semiCircleWidth/2, y: height)
semiCirclesPath.addArc(withCenter: pivotPoint, radius: ciclesRadius, startAngle: -180 * .pi / 180.0, endAngle: 0 * .pi / 180.0, clockwise: true)
semiCirclesPath.addLine(to: CGPoint(x: semiCirclesPath.currentPoint.x + circlesDistance, y: height))
i += 1
}
}
else {
semiCirclesPath.addLine(to: CGPoint(x: 0, y: height))
semiCirclesPath.addLine(to: CGPoint(x: width, y: height))
}
semiCirclesPath.addLine(to: CGPoint(x:width,y: 0))
if(top) {
var x = CGFloat(width)
var i = 0
while x > 0 {
x = width - (semiCircleWidth) * CGFloat(i) - (circlesDistance * CGFloat(i))
let pivotPoint = CGPoint(x: x - semiCircleWidth/2, y: 0)
semiCirclesPath.addArc(withCenter: pivotPoint, radius: ciclesRadius, startAngle: 0 * .pi / 180.0, endAngle: -180 * .pi / 180.0, clockwise: true)
semiCirclesPath.addLine(to: CGPoint(x: semiCirclesPath.currentPoint.x - circlesDistance, y: 0))
i += 1
}
}
semiCirclesPath.close()
return semiCirclesPath
}
RESULTS

Answer 2

In case somebody else will need it somewhere, I am posting here the result I was looking for with #Reinier Melian 's help. I will soon post another version, customising only the first and last cell of a UITableView.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var customView: UIView!
override func viewDidLoad()
{
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.applyZigZagEffect(givenView: customView)
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func pathZigZagForView(givenView: UIView) ->UIBezierPath
{
let width = givenView.frame.size.width
let height = givenView.frame.size.height
let givenFrame = givenView.frame
let zigZagWidth = CGFloat(7)
let zigZagHeight = CGFloat(5)
var yInitial = height-zigZagHeight
let zigZagPath = UIBezierPath(rect: givenFrame.insetBy(dx: 5, dy: 5))
zigZagPath.move(to: CGPoint(x:0, y:0))
zigZagPath.addLine(to: CGPoint(x:0, y:yInitial))
var slope = -1
var x = CGFloat(0)
var i = 0
while x < width
{
x = zigZagWidth * CGFloat(i)
let p = zigZagHeight * CGFloat(slope) - 5
let y = yInitial + p
let point = CGPoint(x: x, y: y)
zigZagPath.addLine(to: point)
slope = slope*(-1)
i += 1
}
zigZagPath.addLine(to: CGPoint(x:width,y: 0))
yInitial = 0 + zigZagHeight
x = CGFloat(width)
i = 0
while x > 0
{
x = width - (zigZagWidth * CGFloat(i))
let p = zigZagHeight * CGFloat(slope) + 5
let y = yInitial + p
let point = CGPoint(x: x, y: y)
zigZagPath.addLine(to: point)
slope = slope*(-1)
i += 1
}
zigZagPath.close()
return zigZagPath
}
func applyZigZagEffect(givenView: UIView)
{
let shapeLayer = CAShapeLayer(layer: givenView.layer)
givenView.backgroundColor = UIColor.clear
shapeLayer.path = self.pathZigZagForView(givenView: givenView).cgPath
shapeLayer.frame = givenView.bounds
shapeLayer.fillColor = UIColor.red.cgColor
shapeLayer.masksToBounds = true
shapeLayer.shadowOpacity = 1
shapeLayer.shadowColor = UIColor.black.cgColor
shapeLayer.shadowOffset = CGSize(width: 0, height: 0)
shapeLayer.shadowRadius = 3
givenView.layer.addSublayer(shapeLayer)
}
}
Result

Answer 3

Here is the code in a Swift 3 playground if anyone wants to check out the solution in action:
https://gist.github.com/thexande/9f93b3c899af63108415936bf13a43da