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Jun 07, 2016 pm 03:43 PM

开头

Quartz2D中还有以CGPath开头的API，Path我们称之为路径，我们之前用Quartz2D画出的东西都是沿着一条路径去画的。而这次我们将来学一下如何先将路径定好之后，再将路径放入图层上下文中。 Path的使用步骤: 1.创建路径CGMutablePathRef path = CGPathCreatMut

Quartz2D中还有以CGPath开头的API，Path我们称之为路径，我们之前用Quartz2D画出的东西都是沿着一条路径去画的。
而这次我们将来学一下如何先将路径定好之后，再将路径放入图层上下文中。

Path的使用步骤:
1.创建路径CGMutablePathRef path = CGPathCreatMutable();
2.通过CGPathAddLineToPoint、CGPathAddArc、CGPathAddEllipseInRect定义路径
3.将路径添加到上下文中，CGContextAddPath

主要代码：

<code><span>#import <span>"DrawSomePath.h"</span></span>

<span><span>@implementation</span> <span>DrawSomePath</span></span>

-(<span>void</span>)drawRect:(<span>CGRect</span>)rect{
    <span>//获得图形上下文</span>
    CGContextRef context = UIGraphicsGetCurrentContext();
    <span>//创建一个可变的路径</span>
    CGMutablePathRef path = CGPathCreateMutable();
    <span>//使用CGPath开头的方法创建要绘制的路径</span>


    CGPathAddEllipseInRect(path, <span>NULL</span>, CGRectMake(<span>10</span>, <span>10</span>, <span>100</span>, <span>100</span>));

    CGPathAddEllipseInRect(path, <span>NULL</span>, CGRectMake(<span>20</span>, <span>20</span>, <span>80</span>, <span>80</span>));

    CGPathAddEllipseInRect(path, <span>NULL</span>, CGRectMake(<span>30</span>, <span>30</span>, <span>60</span>, <span>60</span>));

    CGPathAddEllipseInRect(path, <span>NULL</span>, CGRectMake(<span>40</span>, <span>40</span>, <span>40</span>, <span>40</span>));

    CGPathAddEllipseInRect(path, <span>NULL</span>, CGRectMake(<span>50</span>, <span>50</span>, <span>20</span>, <span>20</span>));

    CGContextSetLineWidth(context, <span>5</span>);

    <span>//将路径加入上下文中</span>
    CGContextAddPath(context, path);
    <span>//开始渲染</span>
    CGContextStrokePath(context);
}

<span>@end</span></code>

运行效果：
Quartz2D
博客代码