Quartz2D

http://donbe.blog.163.com/blog/static/138048021201052093633776/ 详解

代码如下：

DJView 绘制线段 基本图形

 //
 //  DJView.m
 //  基本图形绘制
 //
 //  Created by zjj on 15/6/27.
 //  Copyright (c) 2015年 zjj. All rights reserved.
 //

 #import "DJView.h"

 @implementation DJView

 /**
  *  绘制两个三角形
  */
 - (void)drawRect:(CGRect)rect {
     //1获取上下文
     CGContextRef ctr = UIGraphicsGetCurrentContext();
     //2拼接一个图形
     // 2.0设置A起点
     // 设置颜色
     CGContextSetRGBStrokeColor(ctr, , , , );
     CGContextMoveToPoint(ctr, , );
     // 2.1设置A终点
     CGContextAddLineToPoint(ctr, , );
     CGContextAddLineToPoint(ctr, , );
     // 3渲染到屏幕上(空心)
         CGContextStrokePath(ctr);

     CGContextMoveToPoint(ctr, , );
     // 设置颜色
     CGContextSetRGBStrokeColor(ctr, , , , );
     CGContextAddLineToPoint(ctr, , );
     CGContextAddLineToPoint(ctr, , );
     // 2.2设置B终点
     CGContextAddLineToPoint(ctr, , );
     // 2.3设置C终点
     CGContextAddLineToPoint(ctr, , );
     //链接终点
 //    CGContextClosePath(ctr);
     // 3渲染到屏幕上(实心)
 //    CGContextFillPath(ctr);
     // 3渲染到屏幕上(空心)
     CGContextStrokePath(ctr);
     [self hourglass];
     [self juxing];
 }
 /**
  *  绘空心矩形
  */
 - (void)juxing
 {
     CGContextRef ctr = UIGraphicsGetCurrentContext();
     // 设置线段宽度
     CGContextSetLineWidth(ctr, );
     // 设置颜色
 //    CGContextSetRGBStrokeColor(ctr, 0, 0, 0, 1);
 //    [[UIColor blackColor]setStroke];//(推荐设置颜色方式)
     [[UIColor blackColor]set];//实心空心通用 setStroke设置空心颜色 setFill 设置实心颜色
     // 设置线段头尾部样式
     CGContextSetLineCap(ctr, kCGLineCapRound);
     // 设置线段转折点样式
     CGContextSetLineJoin(ctr, kCGLineJoinRound);
     CGContextAddRect(ctr, CGRectMake(, , , ));
     CGContextStrokePath(ctr);
 }
 - (void)hourglass
 {
     //1获取上下文
     CGContextRef ctr = UIGraphicsGetCurrentContext();
     //2拼接一个图形
     // 2.0设置A起点
     // 设置颜色
 //    CGContextSetRGBStrokeColor(ctr, 0, 1, 1, 1);
 //    [[UIColor blackColor] setFill];
     CGContextMoveToPoint(ctr, , );
     // 2.1设置A终点
     CGContextAddLineToPoint(ctr, , );
     CGContextAddLineToPoint(ctr, , );
     CGContextAddLineToPoint(ctr, , );
     CGContextAddLineToPoint(ctr, , );
     // 2.2设置B终点
     CGContextAddLineToPoint(ctr, , );

     //链接终点
         CGContextClosePath(ctr);
     // 3渲染到屏幕上(空心)
     //    CGContextStrokePath(ctr);
     // 3渲染到屏幕上(实心)
     CGContextFillPath(ctr);
 }
 @end

DJCircle 代码 绘制几何图形

 //
 //  DJCircle.m
 //  基本图形绘制
 //
 //  Created by zjj on 15/6/27.
 //  Copyright (c) 2015年 zjj. All rights reserved.
 //

 #import "DJCircle.h"

 @implementation DJCircle

 // Only override drawRect: if you perform custom drawing.
 // An empty implementation adversely affects performance during animation.
 - (void)drawRect:(CGRect)rect {
     [self drawArc];
     [self drawCircle];
 }
 // 画圆弧
 - (void)drawArc
 {
     CGContextRef crf = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf,, , , , M_PI, );
     [[UIColor redColor] set];//设置颜色
     CGContextFillPath(crf);// 渲染 现实所绘制的东西

     CGContextRef crf1 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf1,, , , , M_PI, );
     CGContextFillPath(crf1);// 渲染 现实所绘制的东西
     //风车
     // 上面圆弧
     CGContextRef crf2 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf2,, , , -M_PI_2, M_PI_2, );
     CGContextFillPath(crf2);// 渲染 现实所绘制的东西
     //右边圆弧
     CGContextRef crf3 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf3,, , , , M_PI, );
     CGContextFillPath(crf3);// 渲染 现实所绘制的东西
     //下边圆弧
     CGContextRef crf4 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf4,, , , -M_PI_2, M_PI_2, );
     CGContextFillPath(crf4);// 渲染 现实所绘制的东西
     //左边圆弧
     CGContextRef crf5 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf5,, , , , M_PI, );
     CGContextFillPath(crf5);// 渲染 现实所绘制的东西
     //3/4圆弧
     CGContextRef crf6 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf6,, , , M_PI_2, M_PI, );
     CGContextFillPath(crf6);// 渲染 现实所绘制的东西
     //1/4左边圆弧
     CGContextRef crf7 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddArc(crf7,, , , M_PI, M_PI_2, );
     CGContextFillPath(crf7);// 渲染 现实所绘制的东西

     //25%圆
     CGContextRef crf8 = UIGraphicsGetCurrentContext();//获得上下文
     CGContextMoveToPoint(crf8, , );
     CGContextAddLineToPoint(crf8, , );
     CGContextAddArc(crf8,, , , M_PI_2, M_PI, );
     CGContextClosePath(crf8);
     CGContextFillPath(crf8);// 渲染 现实所绘制的东西
 }

 - (void)drawCircle
 {
     //画实心圆
     CGContextRef crf = UIGraphicsGetCurrentContext();//获得上下文
     CGContextAddEllipseInRect(crf,CGRectMake(, , , ));//画圆
     [[UIColor blueColor] set];//设置颜色
     CGContextFillPath(crf);// 渲染 现实所绘制的东西
     //画圆圈/圆环
     CGContextRef crf1 = UIGraphicsGetCurrentContext();
     CGContextAddEllipseInRect(crf1,CGRectMake(, , , ));
     CGContextSetLineWidth(crf1, );
     CGContextStrokePath(crf1);
     //画同心圆圈/圆环
     CGContextRef crf2 = UIGraphicsGetCurrentContext();
     CGContextAddEllipseInRect(crf2,CGRectMake(, , , ));
     CGContextSetLineWidth(crf2, );
     CGContextStrokePath(crf2);
 }

 @end

DJTextImageView 绘制图片和文字

 //
 //  DJTextImageView.m
 //  基本图形绘制
 //
 //  Created by zjj on 15/6/28.
 //  Copyright (c) 2015年 zjj. All rights reserved.
 //

 #import "DJTextImageView.h"

 @implementation DJTextImageView
 /**
  *  涂鸦 withAttributes: 字典设置用什么属性 如颜色字体大小
  */
 - (void)drawRect:(CGRect)rect
 {
     [self drawImg];
     [self drawTest];

 }
 - (void)drawImg
 {

     UIImage *img = [UIImage imageNamed:@"格子1.jpg"];
 //    [img drawAtPoint:CGPointZero];
 //    [img drawInRect:CGRectMake(110, 10, 100, 100)];
     [img drawAsPatternInRect:CGRectMake(, , , )];//平铺图片
     NSString *strShuiyin = @"水印http://www.DJweibo.com/168";
     UIImage *pngs = [UIImage imageNamed:@"格子.jpg"];
     NSMutableDictionary   *arrs = [NSMutableDictionary dictionary];
     arrs[NSForegroundColorAttributeName] = [UIColor whiteColor];
     [strShuiyin drawInRect:CGRectMake(, , , ) withAttributes:arrs];
     [pngs drawInRect:CGRectMake(, , , )];

 }

 /**
  *  画文字 withAttributes: 字典设置用什么属性 如颜色字体大小
  */
 - (void)drawTest
 {
     CGRect rects = CGRectMake(, , , );
     // 画一个矩形框
     CGContextRef ctx = UIGraphicsGetCurrentContext();
     CGContextAddRect(ctx, rects);
 //    CGContextFillPath(ctx);
     CGContextStrokePath(ctx);
     //画文字
     NSMutableDictionary   *arrs = [NSMutableDictionary dictionary];
     arrs[NSForegroundColorAttributeName] = [UIColor redColor];
     arrs[NSFontAttributeName] = [UIFont systemFontOfSize:];

     NSString *str = @"土地是以它的肥沃和收获而被估价的；才能也是土地，不过它生产的不是粮食，而是真理。如果只能滋生瞑想和幻想的话，即使再大的才能也只是砂地或盐池，那上面连小草也长不出来的。 —— 别林斯基";
     //[str drawAtPoint:CGPointZero withAttributes:nil];
     [str drawInRect:rects withAttributes:arrs];
 }
 @end