Charts3.0 marker标记

待我称王封你为后i 2022-01-19 01:39 257阅读 0赞

公司项目 charts2.3 升到charts 3.0，marker标记报错， 然后找了很多方法， 后来用了官方看了官方的Demo终于知道该怎么做了

在charts2.3中， 用的是ChartMarker，但是在Charts3.0后就没有这个类， 替换成了MarkerView和MarkerImage， 实验了一下， 发现这两个都可以成功实现标记，而且区别不大！ 上代码：MarkerView

import Foundation
    import Charts
    
    open class TBChartMarker: MarkerView
    {
      open var color: UIColor?
      open var arrowSize = CGSize(width: 15, height: 11)
      open var font: UIFont?
      open var insets = UIEdgeInsets()
      open var minimumSize = CGSize()
      open var xAxisLabels: [String]!
      open var valuesCount: Int!
      
      fileprivate var labelns: NSString?
      fileprivate var _labelSize: CGSize = CGSize()
      fileprivate var _size: CGSize = CGSize()
      fileprivate var _paragraphStyle: NSMutableParagraphStyle?
      fileprivate var _drawAttributes = [String : AnyObject]()
     
      public init(color: UIColor, font: UIFont, insets: UIEdgeInsets)
      {
        super.init(frame: CGRect())   
        //super.init()   
        //使用MarkerView时， 没有关于MarkerView   init() 的方法， 这个时候会报错， 但是MarkerImage不会， 如果你可以麻烦给我说下你是怎么实现的！
        
        self.color = UIColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5)
        self.font = font
        self.insets = insets
        
        _paragraphStyle = NSParagraphStyle.default.mutableCopy() as? NSMutableParagraphStyle
        _paragraphStyle?.alignment = .center
      }
      
      required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
      }
    
      open override func draw(context: CGContext, point: CGPoint)
      {
        if (labelns == nil)
        {
          return
        }
    
        var rect = CGRect(
          origin: CGPoint(
            //        x: point.x + offset.x,
            //        y: point.y + offset.y),
            x: point.x,
            y: 40),
          size: _size)
        rect.origin.x -= _size.width / 2.0
        rect.origin.y -= _size.height
        
        context.saveGState()
        
        context.setFillColor((color?.cgColor)!)
        context.beginPath()
        context.move(to: CGPoint(x: rect.origin.x, y: rect.origin.y))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width, y: rect.origin.y))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x + (rect.size.width + arrowSize.width) / 2.0, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width / 2.0, y: rect.origin.y + rect.size.height))
        context.addLine(to: CGPoint(x: rect.origin.x + (rect.size.width - arrowSize.width) / 2.0, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x, y: rect.origin.y))
        context.fillPath()
        
        rect.origin.y += self.insets.top
        rect.size.height -= self.insets.top + self.insets.bottom
        
        UIGraphicsPushContext(context)
        
        labelns?.draw(in: rect, withAttributes: _drawAttributes)
        
        UIGraphicsPopContext()
        
        context.restoreGState()
      }
      
      open override func refreshContent(entry: ChartDataEntry, highlight: Highlight)
      {
        let date = dateForDayOffset(valuesCount - Int(xAxisLabels[Int(entry.x)])! - 1)
        let formatter = DateFormatter()
        formatter.dateFormat = "MM月dd日"
        
        let dateString = formatter.string(from: date)
    
        let label = dateString.appending("\n\(Int(Double(entry.y.description)!))")
        print("description: \(entry.y.description)")
        labelns = label as NSString
        
        _drawAttributes.removeAll()
        _drawAttributes[NSFontAttributeName] = self.font
        _drawAttributes[NSParagraphStyleAttributeName] = _paragraphStyle
        _drawAttributes[NSForegroundColorAttributeName] = UIColor.white
        
        _labelSize = labelns?.size(attributes: _drawAttributes) ?? CGSize.zero
        _size.width = _labelSize.width + self.insets.left + self.insets.right
        _size.height = _labelSize.height + self.insets.top + self.insets.bottom
        _size.width = max(minimumSize.width, _size.width)
        _size.height = max(minimumSize.height, _size.height)
      }
      
      fileprivate func dateForDayOffset(_ offset: Int) -> Date {
        let date = Date()
        let interval = -(offset * 60 * 60 * 24)
        let offsetDate = date.addingTimeInterval(TimeInterval(interval))
        return offsetDate
      }
    }
    复制代码

MarkerImage：

import Foundation
    import Charts
    
    open class TBChartMarker: MarkerImage
    {
      open var color: UIColor?
      open var arrowSize = CGSize(width: 15, height: 11)
      open var font: UIFont?
      open var insets = UIEdgeInsets()
      open var minimumSize = CGSize()
      open var xAxisLabels: [String]!
      open var valuesCount: Int!
      
      fileprivate var labelns: NSString?
      fileprivate var _labelSize: CGSize = CGSize()
      fileprivate var _size: CGSize = CGSize()
      fileprivate var _paragraphStyle: NSMutableParagraphStyle?
      fileprivate var _drawAttributes = [String : AnyObject]()
      
      
      
      
      public init(color: UIColor, font: UIFont, insets: UIEdgeInsets)
      {
       //super.init(frame: CGRect())
        super.init()
        
        self.color = UIColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5)
        self.font = font
        self.insets = insets
        
        _paragraphStyle = NSParagraphStyle.default.mutableCopy() as? NSMutableParagraphStyle
        _paragraphStyle?.alignment = .center
      }
      
      
      
      
      required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
      }
     
     open override func offsetForDrawing(atPoint point: CGPoint) -> CGPoint {
       let size = self.size
       var points = point
       points.x -= size.width / 2.0
       points.y -= size.height
       return super.offsetForDrawing(atPoint: points)
    
    }
      
      
      open override func draw(context: CGContext, point: CGPoint)
      {
        if (labelns == nil)
        {
          return
        }
    
        var rect = CGRect(
          origin: CGPoint(
            //        x: point.x + offset.x,
            //        y: point.y + offset.y),
            x: point.x,
            y: 40),
          size: _size)
        rect.origin.x -= _size.width / 2.0
        rect.origin.y -= _size.height
        
        context.saveGState()
        
        context.setFillColor((color?.cgColor)!)
        context.beginPath()
        context.move(to: CGPoint(x: rect.origin.x, y: rect.origin.y))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width, y: rect.origin.y))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x + (rect.size.width + arrowSize.width) / 2.0, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x + rect.size.width / 2.0, y: rect.origin.y + rect.size.height))
        context.addLine(to: CGPoint(x: rect.origin.x + (rect.size.width - arrowSize.width) / 2.0, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x, y: rect.origin.y + rect.size.height - arrowSize.height))
        context.addLine(to: CGPoint(x: rect.origin.x, y: rect.origin.y))
        context.fillPath()
        
        rect.origin.y += self.insets.top
        rect.size.height -= self.insets.top + self.insets.bottom
        
        UIGraphicsPushContext(context)
        
        labelns?.draw(in: rect, withAttributes: _drawAttributes)
        
        UIGraphicsPopContext()
        
        context.restoreGState()
      }
      
      open override func refreshContent(entry: ChartDataEntry, highlight: Highlight)
      {
        let date = dateForDayOffset(valuesCount - Int(xAxisLabels[Int(entry.x)])! - 1)
        let formatter = DateFormatter()
        formatter.dateFormat = "MM月dd日"
        
        let dateString = formatter.string(from: date)
    
        let label = dateString.appending("\n\(Int(Double(entry.y.description)!))")
        print("description: \(entry.y.description)")
        labelns = label as NSString
        
        _drawAttributes.removeAll()
        _drawAttributes[NSFontAttributeName] = self.font
        _drawAttributes[NSParagraphStyleAttributeName] = _paragraphStyle
        _drawAttributes[NSForegroundColorAttributeName] = UIColor.white
        
        _labelSize = labelns?.size(attributes: _drawAttributes) ?? CGSize.zero
        _size.width = _labelSize.width + self.insets.left + self.insets.right
        _size.height = _labelSize.height + self.insets.top + self.insets.bottom
        _size.width = max(minimumSize.width, _size.width)
        _size.height = max(minimumSize.height, _size.height)
      }
      
      fileprivate func dateForDayOffset(_ offset: Int) -> Date {
        let date = Date()
        let interval = -(offset * 60 * 60 * 24)
        let offsetDate = date.addingTimeInterval(TimeInterval(interval))
        return offsetDate
      }
    }
    复制代码

转载于:https://juejin.im/post/5a41af476fb9a045293701a9