1 -(void)drawRect:(CGRect)rect{
 2
 3     //设置路径线条颜色
 4     [[UIColor redColor] setStroke];
 5
 6     //绘制直线
 7     UIBezierPath *path1 = [UIBezierPath bezierPath];
 8     [path1 moveToPoint:CGPointMake(30, 100)];
 9     [path1 addLineToPoint:CGPointMake(300, 100)];
10     CGFloat dash[] = {3.0, 3.0};
11     //这里可以设置线条为虚线，前一个数字表示虚线长度，后者表示虚线间隔。
12     //[path1 setLineDash:dash count:2 phase:0];
13     [path1 stroke];
14
15     //绘制折线
16     UIBezierPath *path = [UIBezierPath bezierPath];
17     [path moveToPoint:CGPointMake(30, 120)];
18     [path addLineToPoint:CGPointMake(100, 120)];
19     [path addLineToPoint:CGPointMake(60, 170)];
20     //[path closePath];当端点>=2时，可以闭合路径.
21     [path stroke];
22
23     //二次贝塞尔曲线
24     UIBezierPath *path2 = [UIBezierPath bezierPath];
25     [path2 moveToPoint:CGPointMake(150, 150)];
26     [path2 addQuadCurveToPoint:CGPointMake(300, 150) controlPoint:CGPointMake(200, 80)];
27     [path2 stroke];
28
29     //三次贝塞尔曲线方法
30     UIBezierPath *path3 = [UIBezierPath bezierPath];
31     [path3 moveToPoint:CGPointMake(30, 200)];
32     [path3 addCurveToPoint:CGPointMake(200, 250) controlPoint1:CGPointMake(80, 300) controlPoint2:CGPointMake(150, 150)];
33     [path3 stroke];
34
35     //绘制矩形
36     UIBezierPath *path4 = [UIBezierPath bezierPathWithRect:CGRectMake(250, 200, 100, 100)];
37     [path4 stroke];
38
39     //绘制椭圆，如果长宽相等，则绘制的就是圆形
40     UIBezierPath *path5 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(150, 300, 100, 60)];
41     [path5 stroke];
42
43     //绘制带圆角的矩形
44     UIBezierPath *path6 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(30, 250, 100, 100) cornerRadius:10];
45     [path6 stroke];
46
47     //绘制矩形，并可指定某个角为圆角
48     //    UIRectCornerTopLeft   左上
49     //    UIRectCornerTopRight  右上
50     //    UIRectCornerBottomLeft  左下
51     //    UIRectCornerBottomRight  右下
52     UIBezierPath *path7 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(30, 400, 100, 100) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(40, 40)];
53     [path7 stroke];
54
55     //绘制圆弧
56     //ArcCenter圆点  radius半径  startAngle开始弧度  endAngle结束弧度 clockwise是否顺时针
57     UIBezierPath *path8 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(200, 450) radius:50 startAngle:0 endAngle:M_PI_2*3 clockwise:YES];
58     [path8 stroke];
59
60     //绘制扇形
61     UIBezierPath *path9 = [UIBezierPath bezierPath];
62     [path9 moveToPoint:CGPointMake(100, 520)];
63     [path9 addArcWithCenter:CGPointMake(100, 520) radius:100 startAngle:0 endAngle:M_PI_2 clockwise:YES];
64     [[UIColor redColor] setFill];//设置填充颜色
65     [path9 closePath];//关闭路径
66     [path9 fill];//设置填充
67     [path9 stroke];
68 }

 1 UIBezierPath *path = [UIBezierPath bezierPath];
 2     [path moveToPoint:CGPointMake(30, 100)];
 3     [path addLineToPoint:CGPointMake(100, 100)];
 4
 5     //这里是用了CAShapeLayer,个人习惯在layer里设置线宽、断点样式、连接点样式
 6 //    path.lineWidth = 3;
 7 //    path.lineCapStyle = kCGLineCapSquare;
 8 //    path.lineJoinStyle = kCGLineJoinMiter;
 9
10     CAShapeLayer *layer = [CAShapeLayer layer];
11     layer.path = path.CGPath;
12     layer.lineWidth = 3;
13     layer.lineCap = kCALineCapSquare;
14     layer.lineJoin = kCALineJoinRound;
15     //填充颜色
16     layer.fillColor = [UIColor clearColor].CGColor;
17     //线条填充颜色
18     layer.strokeColor = [UIColor redColor].CGColor;
19     [self.view.layer addSublayer:layer];