Swift实现手机九宫格手势密码解锁

override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.
      self.view = NineCellLockView(frame: CGRectZero)
  }

import UIKit
class NineCellLockView: UIView {
     
    var fingerPoint:CGPoint = CGPoint()
    var linePointointCollection:Array<CGPoint> = Array<CGPoint>()
    var ninePointCollection:Array<CGPoint> = Array<CGPoint>()
     
    var selectPointIndexCollection:Array<Int> = Array<Int>()
     
     
    var circleRadius:CGFloat = 28
    var circleCenterDistance:CGFloat = 96
    var firstCirclePointX:CGFloat = 96
    var firstCirclePointY:CGFloat = 200
     
    func FillNinePointCollection()
    {
        for row in 0...2
        {
            for column in 0...2
            {
                let tempX:CGFloat = CGFloat(column)*self.circleCenterDistance + self.firstCirclePointX
                let tempY:CGFloat = CGFloat(row)*self.circleCenterDistance + self.firstCirclePointY
                self.ninePointCollection.append(CGPoint(x: tempX,y:tempY))
            }
        }
    }
     
     
    func drawCicle(centerPoint:CGPoint,index:Int)
    {
        var context = UIGraphicsGetCurrentContext();
        CGContextSetLineWidth(context, 2.0);
        CGContextAddArc(context, centerPoint.x, centerPoint.y, self.circleRadius, 0.0, CGFloat(M_PI * 2.0), 1)
        let currentIsSelected:Bool = contains(self.selectPointIndexCollection, index)
        if(currentIsSelected)
        {
            //96 169 252
            CGContextSetStrokeColorWithColor(context, UIColor(red: 96/255.0, green: 169/255.0, blue: 252/255.0, alpha: 1).CGColor)
        }else
        {
             
            CGContextSetStrokeColorWithColor(context,  UIColor(red: 144/255.0, green: 149/255.0, blue: 173/255.0, alpha: 1).CGColor)
        }
        CGContextStrokePath(context);
        CGContextAddArc(context, centerPoint.x, centerPoint.y, self.circleRadius, 0.0, CGFloat(M_PI * 2.0), 1)
        CGContextSetFillColorWithColor(context,  UIColor(red: 35/255.0, green: 39/255.0, blue: 54/255.0, alpha: 1).CGColor)
        CGContextFillPath(context)
        if(currentIsSelected)
        {
            CGContextAddArc(context, centerPoint.x, centerPoint.y, 10, 0.0, CGFloat(M_PI * 2.0), 1)
            CGContextSetFillColorWithColor(context, UIColor(red: 96/255.0, green: 169/255.0, blue: 252/255.0, alpha: 1).CGColor)
            CGContextFillPath(context)
        }
    }
     
    func drawNineCircle()
    {
        for p in 0...self.ninePointCollection.count-1
        {
            self.drawCicle(self.ninePointCollection[p],index:p);
        }
         
    }
     
    override init(frame:CGRect)
    {
        super.init(frame:frame)
        //26 29 40
        self.backgroundColor = UIColor(red: 35/255.0, green: 39/255.0, blue: 54/255.0, alpha: 1)
        FillNinePointCollection()
    }
     
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
     
    func DrawLine(p1:CGPoint,p2:CGPoint)
    {
        var bp = UIBezierPath()
        bp.lineWidth  = 3
        bp.lineCapStyle = kCGLineCapRound
        UIColor(red: 96/255.0, green: 169/255.0, blue: 252/255.0, alpha: 1).setStroke()
        bp.moveToPoint(p1)
        bp.addLineToPoint(p2)
        bp.stroke()
         
    }
     
    override func drawRect(rect: CGRect) {
         
        if(self.selectPointIndexCollection.count > 0)
        {
            for index in 0...self.selectPointIndexCollection.count-1
            {
                let nextIndex = index+1
                if(nextIndex <= self.selectPointIndexCollection.count-1)
                {
                    let firstPointIndex=self.selectPointIndexCollection[index]
                    let secondPointIndex=self.selectPointIndexCollection[nextIndex]
                    self.DrawLine(self.ninePointCollection[firstPointIndex],p2:self.ninePointCollection[secondPointIndex])
                }
            }
            if self.fingerPoint.x != -100
            {
                let lastPointIndex=self.selectPointIndexCollection[self.selectPointIndexCollection.count-1]
                self.DrawLine(self.ninePointCollection[lastPointIndex],p2:fingerPoint)
            }
             
        }
        self.drawNineCircle()
    }
     
     
    func distanceBetweenTwoPoint(p1:CGPoint,p2:CGPoint)->CGFloat
    {
        return pow(pow((p1.x-p2.x), 2)+pow((p1.y-p2.y), 2), 0.5)
    }
     
    func CircleIsTouchThenPushInSelectPointIndexCollection(fingerPoint:CGPoint)
    {
         
        for index in 0...self.ninePointCollection.count-1
        {
            if(!contains(self.selectPointIndexCollection, index))
            {
                if(self.distanceBetweenTwoPoint(fingerPoint,p2:self.ninePointCollection[index]) <= circleRadius)
                {
                    self.selectPointIndexCollection.append(index);
                }
            }
        }
         
    }
     
    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        var t = touches.anyObject() as UITouch
        self.selectPointIndexCollection.removeAll(keepCapacity: false)
        self.fingerPoint = t.locationInView(self)
        self.CircleIsTouchThenPushInSelectPointIndexCollection(fingerPoint);
        self.setNeedsDisplay()
    }
     
    override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
        var t = touches.anyObject() as UITouch
        self.fingerPoint = t.locationInView(self)
         
        self.CircleIsTouchThenPushInSelectPointIndexCollection(self.fingerPoint);
         
        self.setNeedsDisplay()
    }
     
    override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
        self.fingerPoint.x = -100
        self.setNeedsDisplay()
        if(self.selectPointIndexCollection.count>0)
        {
            var ReStr:String = ""
            for index in 0...self.selectPointIndexCollection.count-1
            {
                ReStr += String(self.selectPointIndexCollection[index]) + ","
            }
             
            let alertV = UIAlertView(title: "您的结果", message: ReStr, delegate: nil, cancelButtonTitle: "我知道了")
            alertV.show()
        }
    }
}