CALayer垂直居中文本XCode 11.6

编程问答 2022-08-16

问题描述

我正在构建PDF文档，并且图像和文本以CALayers的形式写入视图。我需要在CATextLayer的边框内垂直居中放置文本。我正在使用我从2016年发现的类，如下所示，该类覆盖了draw函数。我想知道是否有任何新技巧可以使这项工作成功？

运行该代码时，您会看到甚至没有显示第2单元格的文本，第3单元格的文本也没有垂直居中。

非常感谢能帮助我的人。

//
//  ViewController.swift
//  CALayers Example
//
//  Created by Thomas Carroll on 8/18/20.
//  Copyright © 2020 Thomas Carroll. All rights reserved.
//

import Cocoa

class ViewController: NSViewController {

    let myLayers = MyLayers()
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.wantsLayer = true
        self.view.layer?.addSublayer(myLayers.insertGrid())
        self.view.layer?.addSublayer(myLayers.insertText())

        // Do any additional setup after loading the view.
    }

    override var representedObject: Any? {
        didSet {
        // Update the view,if already loaded.
        }
    }


}

//
//  MyLayers.swift
//  CALayers Example
//
//  Created by Thomas Carroll on 8/18/20.
//  Copyright © 2020 Thomas Carroll. All rights reserved.
//

import Cocoa

// Set up constant variables
let pageWidth:Float = 72*8.5
let pageHeight:Float = 72*11
// Set up coordinates
let leftX = Int(pageWidth/2-72*2.5)
let col1X = Int(leftX+72)
let col2X = Int(col1X+72)
let col3X = Int(col2X+72)
let col4X = Int(col3X+72)
let rightX = Int(col4X+72)
let bottomY = Int(pageHeight/2-72*2.5)
let row4Y = Int(bottomY+72)
let row3Y = Int(row4Y+72)
let row2Y = Int(row3Y+72)
let row1Y = Int(row2Y+72)
let topY = Int(row1Y+72)

// Set the extension to draw Bezier paths into a CAShapeLayer
extension NSBezierPath {
    // Credit - Henrick - 9/18/2016
    // https://stackoverflow.com/questions/1815568/how-can-i-convert-nsbezierpath-to-cgpath
    public var cgPath: CGPath {
        let path = CGMutablePath()
        var points = [CGPoint](repeating: .zero,count: 3)
        for i in 0 ..< self.elementCount {
            let type = self.element(at: i,associatedPoints: &points)
            switch type {
            case .moveTo:
                path.move(to: points[0])
            case .lineTo:
                path.addLine(to: points[0])
            case .curveTo:
                path.addCurve(to: points[2],control1: points[0],control2: points[1])
            case .closePath:
                path.closeSubpath()
            @unknown default:
                print("Error occured in NSBezierPath extension.")
            }
        }
        return path
    }
}

class MyLayers {
    
    class VerticallyAlignedTextLayer : CATextLayer {

        func calculateMaxLines() -> Int {
            let maxSize = CGSize(width: frame.size.width,height: frame.size.height)
            let font = NSFont(descriptor: self.font!.fontDescriptor,size: self.fontSize)
            let charSize = (font?.capHeight)!
            let text = (self.string ?? "") as! NSString
            let textSize = text.boundingRect(with: maxSize,options: .usesLineFragmentOrigin,attributes: [NSAttributedString.Key.font: font!],context: nil)
            let linesRoundedUp = Int(ceil(textSize.height/charSize))
            return linesRoundedUp
        }
        
        override func draw(in context: CGContext) {
            let height = self.bounds.size.height
            let fontSize = self.fontSize
            let lines = CGFloat(calculateMaxLines())
            let yDiff = (height - lines * fontSize) / 2 - lines * fontSize / 10

            context.saveGState()
            context.translateBy(x: 0,y: yDiff) // Use -yDiff when in non-flipped coordinates (like macOS's default)
            super.draw(in: context)
            context.restoreGState()
        }
    }
        
    func insertGrid() -> CALayer {
        
        /*
         Draws a single table grid of 25 boxes (5 high by 5 wide)
         centered on a letter sized page
         */
        
        // Create a new shape layer for the grid
        let gridLayer = CAShapeLayer()
        
        // Create the path
        let gridPath = NSBezierPath()

        // Assign the grid fill and stroke colors
        gridLayer.strokeColor = NSColor.purple.cgColor
        gridLayer.fillColor = NSColor.clear.cgColor

        // Draw the paths for the grid
        // Create the outside box
        gridPath.move(to: CGPoint(x: leftX,y: bottomY)) // Bottom left corner
        gridPath.line(to: CGPoint(x: leftX,y: topY)) // Column 1,left line
        gridPath.line(to: CGPoint(x: rightX,y: topY)) // Row 1,top line
        gridPath.line(to: CGPoint(x: rightX,y: bottomY)) // Column 5 right line
        gridPath.line(to: CGPoint(x: leftX,y: bottomY)) // Row 5 bottom line
        
        // Add in column lines
        gridPath.move(to: CGPoint(x: col1X,y: topY)) // Between columns 1 & 2
        gridPath.line(to: CGPoint(x: col1X,y: bottomY)) // Line between columns 1 & 2
        gridPath.move(to: CGPoint(x: col2X,y: topY)) // Between columns 2 & 3
        gridPath.line(to: CGPoint(x: col2X,y: bottomY)) // Line between columns 2 & 3
        gridPath.move(to: CGPoint(x: col3X,y: topY)) // Between columns 3 & 4
        gridPath.line(to: CGPoint(x: col3X,y: bottomY)) // Line between columns 3 & 4
        gridPath.move(to: CGPoint(x: col4X,y: topY)) // Between columns 4 & 5
        gridPath.line(to: CGPoint(x: col4X,y: bottomY)) // Line between columns 4 & 5
        // Add in row lines
        gridPath.move(to: CGPoint(x: leftX,y: row1Y)) // Between rows 1 & 2
        gridPath.line(to: CGPoint(x: rightX,y: row1Y)) // Line between rows 1 & 2
        gridPath.move(to: CGPoint(x: leftX,y: row2Y)) // Between rows 2 & 3
        gridPath.line(to: CGPoint(x: rightX,y: row2Y)) // Line between rows 2 & 3
        gridPath.move(to: CGPoint(x: leftX,y: row3Y)) // Between rows 3 & 4
        gridPath.line(to: CGPoint(x: rightX,y: row3Y)) // Line between rows 3 & 4
        gridPath.move(to: CGPoint(x: leftX,y: row4Y)) // Between rows 4 & 5
        gridPath.line(to: CGPoint(x: rightX,y: row4Y)) // Line between rows 4 & 5

        // Close the path
        gridPath.close()
        // Add grid to layer (note the use of the cgPath extension)
        gridLayer.path = gridPath.cgPath

        return gridLayer
    }

    func insertText() -> CALayer {
        
        // Create a CALayer to add the textLayer to
        let myCALayer = CALayer()
        // Set up an array to hold the x coordinate for each column
        let colPosX = [leftX,col1X,col2X,col3X,col4X]
        // Set up an array to hold the y coordinate for the first card
        let rowPosY = [row1Y,row2Y,row3Y,row4Y,bottomY]
        // Set some default text to be used in the textLayers
        let cellText = ["This is some cell 1 text","Cell 2 text","This is text cell 3"]
        
        for i in (0...2) {
            let textLayer = VerticallyAlignedTextLayer()
            textLayer.string = cellText[i]
            textLayer.fontSize = 14
            // Set the frame to be 1 pixel smaller than the grid cell to provide 1px padding
            textLayer.frame = CGRect(origin: CGPoint(x: Int(colPosX[i])+1,y: Int(rowPosY[i])+1),size: CGSize(width: 70,height: 70))
            textLayer.alignmentMode = .center
            textLayer.isWrapped = true
            textLayer.foregroundColor = NSColor.black.cgColor
            textLayer.backgroundColor = NSColor.clear.cgColor
            textLayer.truncationMode = .none
            myCALayer.addSublayer(textLayer)
        }
        
        return myCALayer
    }
}

解决方法

这就是我在系统上得到的。 enter image description here

,

我所做的就是在func draw（）中添加一些打印语句，以便我可以看到发生了什么，然后在YDiff计算之前添加一个负号。在我看来，它没有显示文本，因为Y坐标正在将其平移到框外。此外，.translateBy后面的注释表示使用负YDiff。

override func draw(in context: CGContext) {
    let height = self.bounds.size.height
    print("height = \(height)")
    let fontSize = self.fontSize
    let lines = CGFloat(calculateMaxLines())
    print("lines = \(lines)")
    let yDiff = -(height - lines * fontSize) / 2 - lines * fontSize / 10
    print("yDiff = \(yDiff)")
    context.saveGState()
    context.translateBy(x: 0,y: yDiff) // Use -yDiff when in non-flipped coordinates (like macOS's default)
    super.draw(in: context)
    print("draw called.")
    context.restoreGState()
    }
,

以下代码是我使用的代码，但看来您可以使用。唯一的变化是如上所述对func draw（）进行了更改。您可以从终端运行此代码，也可以通过使用演示的主要部分并用演示的代码替换Xcode的AppDelegate并添加其他类来创建自己的Xcode应用。

/*
  To run in Terminal: swiftc calayer.swift  -framework Cocoa -o calayer && ./calayer 
*/

import Cocoa

// Set up constant variables
let pageWidth:Float = 72*8.5
let pageHeight:Float = 72*11
// Set up coordinates
let leftX = Int(pageWidth/2-72*2.5)
let col1X = Int(leftX+72)
let col2X = Int(col1X+72)
let col3X = Int(col2X+72)
let col4X = Int(col3X+72)
let rightX = Int(col4X+72)
let bottomY = Int(pageHeight/2-72*2.5)
let row4Y = Int(bottomY+72)
let row3Y = Int(row4Y+72)
let row2Y = Int(row3Y+72)
let row1Y = Int(row2Y+72)
let topY = Int(row1Y+72)

// Set the extension to draw Bezier paths into a CAShapeLayer
extension NSBezierPath {
 // Credit - Henrick - 9/18/2016
 // https://stackoverflow.com/questions/1815568/how-can-i-convert-nsbezierpath-to-cgpath
 public var cgPath: CGPath {
   let path = CGMutablePath()
   var points = [CGPoint](repeating: .zero,count: 3)
   for i in 0 ..< self.elementCount {
     let type = self.element(at: i,associatedPoints: &points)
       switch type {
         case .moveTo:
           path.move(to: points[0])
         case .lineTo:
           path.addLine(to: points[0])
         case .curveTo:
           path.addCurve(to: points[2],control1: points[0],control2: points[1])
         case .closePath:
           path.closeSubpath()
         @unknown default:
           print("Error occured in NSBezierPath extension.")
         }
    }
   return path
  }
}

class MyLayers {
    
  class VerticallyAlignedTextLayer : CATextLayer {

  func calculateMaxLines() -> Int {
   let maxSize = CGSize(width: frame.size.width,height: frame.size.height)
   let font = NSFont(descriptor: self.font!.fontDescriptor,size: self.fontSize)
   let charSize = (font?.capHeight)!
   let text = (self.string ?? "") as! NSString
   let textSize = text.boundingRect(with: maxSize,options: .usesLineFragmentOrigin,attributes: [NSAttributedString.Key.font: font!],context: nil)
   let linesRoundedUp = Int(ceil(textSize.height/charSize))
   return linesRoundedUp
   }
        
   override func draw(in context: CGContext) {
    let height = self.bounds.size.height
    print("height = \(height)")
    let fontSize = self.fontSize
    let lines = CGFloat(calculateMaxLines())
    print("lines = \(lines)")
    //let yDiff = -(height - lines * fontSize) / 2 - lines * fontSize / 10
    let yDiff = -(height - lines * fontSize) / 2 - lines * fontSize / 5
    print("yDiff = \(yDiff)")
    context.saveGState()
    context.translateBy(x: 0,y: yDiff) // Use -yDiff when in non-flipped coordinates (like macOS's default)
    super.draw(in: context)
    print("draw called.")
    print("==========================")
    context.restoreGState()
    }
  }
        
 func insertGrid() -> CALayer {
        
  /*
    Draws a single table grid of 25 boxes (5 high by 5 wide)
    centered on a letter sized page
  */
        
  // Create a new shape layer for the grid
   let gridLayer = CAShapeLayer()
        
  // Create the path
   let gridPath = NSBezierPath()

  // Assign the grid fill and stroke colors
  gridLayer.strokeColor = NSColor.purple.cgColor
  gridLayer.fillColor = NSColor.clear.cgColor

  // Draw the paths for the grid
  // Create the outside box
  gridPath.move(to: CGPoint(x: leftX,y: bottomY)) // Bottom left corner
  gridPath.line(to: CGPoint(x: leftX,y: topY)) // Column 1,left line
  gridPath.line(to: CGPoint(x: rightX,y: topY)) // Row 1,top line
  gridPath.line(to: CGPoint(x: rightX,y: bottomY)) // Column 5 right line
  gridPath.line(to: CGPoint(x: leftX,y: bottomY)) // Row 5 bottom line
        
  // Add in column lines
  gridPath.move(to: CGPoint(x: col1X,y: topY)) // Between columns 1 & 2
  gridPath.line(to: CGPoint(x: col1X,y: bottomY)) // Line between columns 1 & 2
  gridPath.move(to: CGPoint(x: col2X,y: topY)) // Between columns 2 & 3
  gridPath.line(to: CGPoint(x: col2X,y: bottomY)) // Line between columns 2 & 3
  gridPath.move(to: CGPoint(x: col3X,y: topY)) // Between columns 3 & 4
  gridPath.line(to: CGPoint(x: col3X,y: bottomY)) // Line between columns 3 & 4
  gridPath.move(to: CGPoint(x: col4X,y: topY)) // Between columns 4 & 5
  gridPath.line(to: CGPoint(x: col4X,y: bottomY)) // Line between columns 4 & 5
  // Add in row lines
  gridPath.move(to: CGPoint(x: leftX,y: row1Y)) // Between rows 1 & 2
  gridPath.line(to: CGPoint(x: rightX,y: row1Y)) // Line between rows 1 & 2
  gridPath.move(to: CGPoint(x: leftX,y: row2Y)) // Between rows 2 & 3
  gridPath.line(to: CGPoint(x: rightX,y: row2Y)) // Line between rows 2 & 3
  gridPath.move(to: CGPoint(x: leftX,y: row3Y)) // Between rows 3 & 4
  gridPath.line(to: CGPoint(x: rightX,y: row3Y)) // Line between rows 3 & 4
  gridPath.move(to: CGPoint(x: leftX,y: row4Y)) // Between rows 4 & 5
  gridPath.line(to: CGPoint(x: rightX,y: row4Y)) // Line between rows 4 & 5

  // Close the path
  gridPath.close()
  // Add grid to layer (note the use of the cgPath extension)
  gridLayer.path = gridPath.cgPath

  return gridLayer
 }

 func insertText() -> CALayer {
        
 // Create a CALayer to add the textLayer to
 let myCALayer = CALayer()
 // Set up an array to hold the x coordinate for each column
 let colPosX = [leftX,col1X,col2X,col3X,col4X]
 // Set up an array to hold the y coordinate for the first card
 let rowPosY = [row1Y,row2Y,row3Y,row4Y,bottomY]
 // Set some default text to be used in the textLayers
 // let cellText = ["This is some cell 1 text","Some cell 2 text","This is text cell 3"]
 let cellText = ["This is some cell 1 text","Cell 2 text","This is text cell 3","hello"]
        
 for i in (0...3) {
  let textLayer = VerticallyAlignedTextLayer()
  textLayer.string = cellText[i]
  print(cellText[i])
  textLayer.fontSize = 14
  // Set the frame to be 1 pixel smaller than the grid cell to provide 1px padding
  textLayer.frame = CGRect(origin: CGPoint(x: Int(colPosX[i])+1,y: Int(rowPosY[i])+1),size: CGSize(width: 70,height: 70))
  textLayer.alignmentMode = .center
  textLayer.isWrapped = true
  textLayer.foregroundColor = NSColor.black.cgColor
  textLayer.backgroundColor = NSColor.clear.cgColor
  textLayer.truncationMode = .none
  myCALayer.addSublayer(textLayer)
  }  
  print("=======================")    
  return myCALayer
 }
}


class AppDelegate: NSObject,NSApplicationDelegate {
var window:NSWindow!

@objc func myBtnAction(_ sender:AnyObject ) {
  NSSound.beep()
}

func buildMenu() {
 let mainMenu = NSMenu()
 NSApp.mainMenu = mainMenu
 // **** App menu **** //
 let appMenuItem = NSMenuItem()
 mainMenu.addItem(appMenuItem)
 let appMenu = NSMenu()
 appMenuItem.submenu = appMenu
 appMenu.addItem(withTitle: "Quit",action:#selector(NSApplication.terminate),keyEquivalent: "q") 
}
    
func buildWnd() {
    
let _wndW : CGFloat = 650
let _wndH : CGFloat = 700

 window = NSWindow(contentRect:NSMakeRect(0,_wndW,_wndH),styleMask:[.titled,.closable,.miniaturizable,.resizable],backing:.buffered,defer:false)
 window.center()
 window.title = "Swift Test Window"
 window.makeKeyAndOrderFront(window)

 let view = NSView()
 let myLayers = MyLayers()
 view.frame = NSMakeRect(20,60,_wndW - 40,_wndH - 80)
 view.wantsLayer = true
 view.layer?.addSublayer(myLayers.insertGrid())
 view.layer?.addSublayer(myLayers.insertText())
 window.contentView!.addSubview (view)

// **** Quit btn **** //
let quitBtn = NSButton (frame:NSMakeRect( _wndW - 50,10,40,40 ))
 quitBtn.bezelStyle = .circular
 quitBtn.autoresizingMask = [.minXMargin,.maxYMargin]
 quitBtn.title = "Q"
 quitBtn.action = #selector(NSApplication.terminate)
 window.contentView!.addSubview(quitBtn)
}
 
func applicationDidFinishLaunching(_ notification: Notification) {
 buildMenu()
 buildWnd()
}

func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
 return true
}

}
let appDelegate = AppDelegate()

// **** main.swift **** //
let app = NSApplication.shared
app.delegate = appDelegate
app.setActivationPolicy(.regular)
app.activate(ignoringOtherApps:true)
app.run()
,

Swift 5.3

好吧，我终于弄清楚了该怎么做。具体来说，我需要更改textLayer的fontSize，以使其在水平和垂直方向上都适合在边框内，同时也可以在边框内垂直居中。为此，我找到了一些代码来检查属性字符串的boundingRect。另外请注意，我更改了yDiff计算，将fontSize除以6.5而不是10，它对我来说垂直放置文本更好。

class MyLayers {
    
    class VerticallyAlignedTextLayer : CATextLayer {

        func calculateMaxLines() -> Int {
            let maxSize = CGSize(width: frame.size.width,height: frame.size.width)
            let font = NSFont(descriptor: self.font!.fontDescriptor,size: self.fontSize)
            let charSize = floor(font!.capHeight)
            let text = (self.string ?? "") as! NSString
            let textSize = text.boundingRect(with: maxSize,context: nil)
            let linesRoundedUp = Int(floor(textSize.height/charSize))
            return linesRoundedUp
        }
        
        override func draw(in context: CGContext) {
            let height = self.bounds.size.height
            let fontSize = self.fontSize
            let lines = CGFloat(calculateMaxLines())
            let yDiff = -(height - lines * fontSize) / 2 - lines * fontSize / 6.5 // Use -(height - lines * fontSize) / 2 - lines * fontSize / 6.5 when in non-flipped coordinates (like macOS's default)

            context.saveGState()
            context.translateBy(x: 0,y: yDiff)
            super.draw(in: context)
            context.restoreGState()
        }
    }
        
    func insertGrid() -> CALayer {
        
        /*
         Draws a single table grid of 25 boxes (5 high by 5 wide)
         centered on a letter sized page
         */
        
        // Create a new shape layer for the grid
        let gridLayer = CAShapeLayer()
        
        // Create the path
        let gridPath = NSBezierPath()

        // Assign the grid fill and stroke colors
        gridLayer.strokeColor = NSColor.purple.cgColor
        gridLayer.fillColor = NSColor.white.cgColor

        // Draw the paths for the grid
        // Create the outside box
        gridPath.move(to: CGPoint(x: leftX,y: bottomY)) // Bottom left corner
        gridPath.line(to: CGPoint(x: leftX,left line
        gridPath.line(to: CGPoint(x: rightX,top line
        gridPath.line(to: CGPoint(x: rightX,y: bottomY)) // Column 5 right line
        gridPath.line(to: CGPoint(x: leftX,y: bottomY)) // Row 5 bottom line
        //gridPath.close()
        //gridLayer.path = gridPath.cgPath
        
        // Add in column lines
        gridPath.move(to: CGPoint(x: col1X,y: topY)) // Between columns 1 & 2
        gridPath.line(to: CGPoint(x: col1X,y: bottomY)) // Line between columns 1 & 2
        gridPath.move(to: CGPoint(x: col2X,y: topY)) // Between columns 2 & 3
        gridPath.line(to: CGPoint(x: col2X,y: bottomY)) // Line between columns 2 & 3
        gridPath.move(to: CGPoint(x: col3X,y: topY)) // Between columns 3 & 4
        gridPath.line(to: CGPoint(x: col3X,y: bottomY)) // Line between columns 3 & 4
        gridPath.move(to: CGPoint(x: col4X,y: topY)) // Between columns 4 & 5
        gridPath.line(to: CGPoint(x: col4X,y: bottomY)) // Line between columns 4 & 5
        // Add in row lines
        gridPath.move(to: CGPoint(x: leftX,y: row1Y)) // Between rows 1 & 2
        gridPath.line(to: CGPoint(x: rightX,y: row1Y)) // Line between rows 1 & 2
        gridPath.move(to: CGPoint(x: leftX,y: row2Y)) // Between rows 2 & 3
        gridPath.line(to: CGPoint(x: rightX,y: row2Y)) // Line between rows 2 & 3
        gridPath.move(to: CGPoint(x: leftX,y: row3Y)) // Between rows 3 & 4
        gridPath.line(to: CGPoint(x: rightX,y: row3Y)) // Line between rows 3 & 4
        gridPath.move(to: CGPoint(x: leftX,y: row4Y)) // Between rows 4 & 5
        gridPath.line(to: CGPoint(x: rightX,y: row4Y)) // Line between rows 4 & 5

        // Close the path
        gridPath.close()
        // Add grid to layer (note the use of the cgPath extension)
        gridLayer.path = gridPath.cgPath

        return gridLayer
    }
    
    func sizeOfRect(string: NSString,fontSize: CGFloat) -> Int {
        /* Credit to Jake Marsh - 12/10/2015
            https://littlebitesofcocoa.com/144-drawing-multiline-strings
         
            Return the height of a boundingRect for a specified string at a specified fontSize
         */
        let cellFontSize:CGFloat = fontSize
        let cellFont:NSFont = NSFont.systemFont(ofSize: cellFontSize,weight: .regular)
        let cellParagraphStyle = NSMutableParagraphStyle()
        let cellTextAttributes = [NSAttributedString.Key.font: cellFont,NSAttributedString.Key.paragraphStyle: cellParagraphStyle]
        let cellDrawingOptions: NSString.DrawingOptions = [
        .usesLineFragmentOrigin,.usesFontLeading]
        cellParagraphStyle.lineHeightMultiple = 1.0
        cellParagraphStyle.lineBreakMode = .byWordWrapping
        
        return Int(string.boundingRect(with: CGSize(width: 70,height: CGFloat.infinity),options: cellDrawingOptions,attributes: cellTextAttributes).height)
    }

    func insertText() -> CALayer {
        
        // Create a CALayer to add the textLayer to
        let myCALayer = CALayer()
        // Set up an array to hold the x coordinate for each column
        let colPosX = [leftX,col4X]
        // Set up an array to hold the y coordinate for the first card
        let rowPosY = [row1Y,bottomY]
        // Set some default text to be used in the textLayers
        let cellText = ["This is some cell 1 text that is kind of long","Some really really long text"]
        
        for i in (0...3) {
            // Create a vertically centered textLayer
            let textLayer = VerticallyAlignedTextLayer()
            // Set up the initial font size for the text
            var fontSize:CGFloat = 14
            // Assign a string to the textLayer
            textLayer.string = cellText[i]
            // Check the vertical hieght of a rectangle that would contain the text based on the current fontSize.  If the text is taler than the specific box height,reduce the fontSize my a half point until it is within the specified height of the box.
            while sizeOfRect(string: cellText[i] as NSString,fontSize: fontSize) > 68 {
                fontSize -= 0.5
            }
            // Assign the adjusted fontSize to the textLayer
            textLayer.fontSize = fontSize
            // Set the frame to be 4 pixel smaller than the grid cell to provide 2px padding
            textLayer.frame = CGRect(origin: CGPoint(x: Int(colPosX[i])+2,y: Int(rowPosY[i])+2),size: CGSize(width: 68,height: 68))
            textLayer.alignmentMode = .center
            textLayer.isWrapped = true
            textLayer.foregroundColor = NSColor.black.cgColor
            textLayer.backgroundColor = NSColor.clear.cgColor
            textLayer.truncationMode = .none
            myCALayer.addSublayer(textLayer)
        }
        
        return myCALayer
        
    }

}
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