柱状图表实现（swift）

1.用drawRect的绘制图像功能实现柱状图表。
做的时候没写注释，做完也懒得写了
效果图：

相关代码：
import UIKit

class YGHistogramView: UIView {
var height:CGFloat = 0
var width:CGFloat = 20
var heightArray:NSMutableArray = [10,16,36,24,22,6,10]
var ordinHeightArray:NSMutableArray = [0,0,0,0,0,0,0]
var textArray:NSArray = [“一”,”二”,”三”,”四”,”五”,”六”,”七”]
var numberLblBottom1 = NSLayoutConstraint()
var numberLblBottom2 = NSLayoutConstraint()
var numberLblBottom3 = NSLayoutConstraint()
var numberLblBottom4 = NSLayoutConstraint()
var numberLblBottom5 = NSLayoutConstraint()
var numberLblBottom6 = NSLayoutConstraint()
var numberLblBottom7 = NSLayoutConstraint()
var numberBottomArray = NSMutableArray()

var numberLblArray = NSMutableArray()
override init(frame: CGRect) {
    super.init(frame: frame)
    numberBottomArray.addObject(numberLblBottom1)
    numberBottomArray.addObject(numberLblBottom2)
    numberBottomArray.addObject(numberLblBottom3)
    numberBottomArray.addObject(numberLblBottom4)
    numberBottomArray.addObject(numberLblBottom5)
    numberBottomArray.addObject(numberLblBottom6)
    numberBottomArray.addObject(numberLblBottom7)
    self.backgroundColor = UIColor.clearColor()
    for i in 0 ..< textArray.count {
        let lbl = UILabel(frame: CGRectMake(0, 205, width, width))
        lbl.center = CGPointMake(ViewWidth(self)/CGFloat(textArray.count+1)*CGFloat(i+1), 205+width/2)
        lbl.textAlignment = .Center
        lbl.font = UIFont.systemFontOfSize(12)
        lbl.textColor = UIColor.whiteColor()
        lbl.text = textArray[i] as? String
        self.addSubview(lbl)

        let numberLbl = UILabel()
        numberLbl.translatesAutoresizingMaskIntoConstraints = false
        numberLbl.textAlignment = .Center
        numberLbl.font = UIFont.systemFontOfSize(12)
        numberLbl.textColor = UIColor.whiteColor()
        self.addSubview(numberLbl)
        self.addConstraint(NSLayoutConstraint(item: numberLbl, attribute: .Left, relatedBy: .Equal, toItem: lbl, attribute: .Left, multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: numberLbl, attribute: .Right, relatedBy: .Equal, toItem: lbl, attribute: .Right, multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: numberLbl, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .Height, multiplier: 1, constant: 20))
        numberBottomArray[i] = NSLayoutConstraint(item: numberLbl, attribute: .Bottom, relatedBy: .Equal, toItem: lbl, attribute: .Bottom, multiplier: 1, constant: -25)
        self.addConstraint(numberBottomArray[i] as! NSLayoutConstraint)

        numberLblArray.addObject(numberLbl)
    }


    NSTimer.scheduledTimerWithTimeInterval(0.04, target: self, selector: "setHistogram:", userInfo: nil, repeats: true)
}

func setHistogram(timer:NSTimer) {
    if (self.height > CGFloat((heightArray.valueForKeyPath("@max.floatValue")?.floatValue)!)) {
        timer.fireDate = NSDate.distantFuture()
    } else {
        self.height += 1
        for i in 0 ..< ordinHeightArray.count {
            if (CGFloat(ordinHeightArray[i] as! NSNumber) < CGFloat(heightArray[i] as! NSNumber)) {
                var heee = CGFloat(ordinHeightArray[i] as! NSNumber)
                heee += 1
                ordinHeightArray.removeObjectAtIndex(i)
                ordinHeightArray.insertObject(heee, atIndex: i)
                let ssss:NSLayoutConstraint = numberBottomArray[i] as! NSLayoutConstraint
                ssss.constant = -25-heee*5
                let tttt:UILabel = numberLblArray[i] as! UILabel
                tttt.text = String(ordinHeightArray[i])
            }
        }
        self.setNeedsDisplay()
    }
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func drawRect(rect: CGRect) {
    for i in 0 ..< ordinHeightArray.count {
            let histogram = UIBezierPath(rect: CGRectMake(ViewWidth(self)/8*CGFloat(i+1), 200, 0, -CGFloat(ordinHeightArray[i] as! NSNumber)*5))
            histogram.lineWidth = width;
            RGBACOLOR(255, g: 255, b: 255, a: 0.8).setStroke()
            histogram.stroke()
    }
}

}

如果想要完整代码，请到[我的github地址]下载(https://github.com/w463719052/SwiftStudy)