我已经用 swift 开发应用程序几个月了,但我不知道如何将数据传递到图表。所以基本上我拥有的是一个 View Controller ,里面有一个数组,以及一个包含图表的 UIView。我想要做的是 UIView 中的图形绘制 ViewController 中的数组。所以我想要的是将 View Controller 中的数组 dataMoneyTracker1 中的数据传递到 UIView 中的数组 graphPoints,或者我可以从 uiview 访问 View Controller 中的数组。
感谢您的回答!
这是我的代码:
查看 Controller
import UIKit
class GonDetail2ViewController: UIViewController {
var dataMoneyTracker1 = [Int]()
@IBOutlet var View1: UIView!
}
UI View
import UIKit
class GonGraphUIView: UIView {
var graphPoints = [Int]()
override func drawRect(rect: CGRect) {
let width = rect.width
let height = rect.height
let margin:CGFloat = 20.0
let columnXPoint = { (column:Int) -> CGFloat in
//Calculate gap between points
let spacer = (width - margin*2 - 4) /
CGFloat((self.graphPoints.count - 1))
var x:CGFloat = CGFloat(column) * spacer
x += margin + 2
return x
}
let topBorder:CGFloat = 60
let bottomBorder:CGFloat = 50
let graphHeight = height - topBorder - bottomBorder
let maxValue = graphPoints.maxElement()
let columnYPoint = { (graphPoint:Int) -> CGFloat in
var y:CGFloat = CGFloat(graphPoint) /
CGFloat(maxValue!) * graphHeight
y = graphHeight + topBorder - y // Flip the graph
return y
}
UIColor.whiteColor().setFill()
UIColor.whiteColor().setStroke()
//set up the points line
let graphPath = UIBezierPath()
//go to start of line
graphPath.moveToPoint(CGPoint(x:columnXPoint(0),
y:columnYPoint(graphPoints[0])))
//add points for each item in the graphPoints array
//at the correct (x, y) for the point
for i in 1..<graphPoints.count {
let nextPoint = CGPoint(x:columnXPoint(i),
y:columnYPoint(graphPoints[i]))
graphPath.addLineToPoint(nextPoint)
}
graphPath.stroke()
graphPath.lineWidth = 2.0
graphPath.stroke()
//Draw the circles on top of graph stroke
for i in 0..<graphPoints.count {
var point = CGPoint(x:columnXPoint(i), y:columnYPoint(graphPoints[i]))
point.x -= 5.0/2
point.y -= 5.0/2
let circle = UIBezierPath(ovalInRect:
CGRect(origin: point,
size: CGSize(width: 5.0, height: 5.0)))
circle.fill()
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
// Drawing code
}
*/
}
}
最佳答案
可以使用此变量重新定义 UIViewController:
@IBOutlet var View1: GonGraphUIView!
和GonGraphUIView
var graphPoints:[Int]?
然后在drawRect
if let graphPoints = graphPoints {
// draw the graph
} else { do nothing }
所以 UIViewController 可以说
View1.graphPoints = dataMoneyTracker1
View1.setneedsDisplay()
关于ios - 图表的数据 swift ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35252175/