酱油05-绘图

使用UIGraphicsGetCurrentContext绘图

import UIKit

class Draw: UIView {


    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect) {
        // Drawing code
        drawline()
        //设置关联上下文
        let begin = UIGraphicsGetCurrentContext()
        //绘制矩形
        CGContextAddRect(begin, CGRect(x: 100, y: 100, width: 200, height: 100))
        
        CGContextAddRect(begin, CGRect(x: 100, y: 100, width: 100, height: 200))
        //绘制椭圆
        CGContextAddEllipseInRect(begin, CGRect(x: 0, y: 0, width: 100, height: 300))
        //绘制圆弧（中心点，半径，起始角度，终点角度，方向）
        CGContextAddArc(begin, 200, 300, 150, 1, CGFloat(M_PI_4), 0)
        
        //贝兹曲线起始位置
        CGContextMoveToPoint(begin, 0, 300)
        //曲线三点绘制（一个控制点，一个终点）
        CGContextAddQuadCurveToPoint(begin, 50, 0, 400, 300)

        //曲线四点绘制（两个控制点，最后一个为终点）
        CGContextAddCurveToPoint(begin, 50, 100, 250, 200, 300, 300)
       
        
        CGContextSetStrokeColorWithColor(begin, UIColor.redColor().CGColor)
        //设置填充色
        CGContextSetFillColor(begin, [1,0,0,1])
        //设置只填充
        CGContextFillPath(begin)
        //设置绘制开始点
        CGContextMoveToPoint(begin, 100, 0)
        //尝试绘制一个五角星
        CGContextAddLineToPoint(begin, 0, 200)
        CGContextAddLineToPoint(begin, 200, 100)
        CGContextAddLineToPoint(begin, 0, 100)
        CGContextAddLineToPoint(begin, 200, 200)
        CGContextAddLineToPoint(begin, 100, 0)
        CGContextSetLineWidth(begin, 5)
        //设置绘制转折点为圆角
        CGContextSetLineCap(begin, .Round)
        CGContextSetStrokeColorWithColor(begin, UIColor.cyanColor().CGColor)
        CGContextSetLineDash(begin, 2, [2,5], 2)

 //EO为奇偶校验，（单为里，双为外，只填充里）,Fill为整个填充，Stroke为填充边框
        CGContextDrawPath(begin, .EOFillStroke)
        CGContextStrokePath(begin)
        
    }
    
    func drawline(){
    
        let begin = UIGraphicsGetCurrentContext()
        
        var x : CGFloat = 50
        var y : CGFloat = 50
        //循环绘制表格
        while x < self.frame.size.width{
            CGContextMoveToPoint(begin, x, 0)
            CGContextAddLineToPoint(begin, x, self.frame.size.height)
            x += 50
        }
        while y < self.frame.size.height{
            CGContextMoveToPoint(begin, 0, y)
            CGContextAddLineToPoint(begin, self.frame.size.width, y)
            y += 50
        }
        CGContextSetStrokeColorWithColor(begin, UIColor.cyanColor().CGColor)
        //进行当前绘制保存
        CGContextSaveGState(begin)
        //设置绘制线为虚线
        CGContextSetLineDash(begin, 2, [2,5], 2)
        //设置绘制线的宽度
        CGContextSetLineWidth(begin, 3)
        //执行绘制
        CGContextStrokePath(begin)
        //重新回到上次的保存点
        CGContextRestoreGState(begin)
    }
}