//Common properties

    /*

1.CGPath: convert UIBezierPath class to CGPath

2.currentPoint: the location of the current path, which can be understood as the end of the path

3.lineWidth: line width

4.lineCapStyle: end style

5.lineJoinStyle: connection type

6.flatness: the fineness of the drawing line, which is 0.6 by default. The larger the value, the longer the processing time

7.usesEvenOddFillRule: a rule for judging the rules of odd and even array to draw an image, and for filling color when the figure is complex. Similar chessboard

8.miterLimit: the maximum miter length (only valid if kcglyjoinmitter is used, and the maximum limit is 10). The smaller the angle of the corner, the greater the miter length. To avoid the miter length being too long, use the lineLimit attribute limit. If the miter length exceeds the miterLimit, the corner will be displayed as KCALineJoinBevel type

9.- setLineDash:count:phase: draw a dotted line for path. The dash array stores the length of each dotted line. count is the number of array elements, and phase is the starting position

    */

lineCapStyle / / endpoint type

    /*

kCGLineCapButt, / / no endpoint

Kcklinecapround, / / circular end point

Kcglycapsquare / / square endpoint (same style as kcglycapabutt, but a little longer than kcglycapabutt)

     */

lineJoinStyle / / type of intersection

    /*

Kcklinejoinmitter, / / sharp corner connection

kCGLineJoinRound, / / fillet join

Kcklinejoinbevel / / diagonal join

     */

 1 -(void)drawRect:(CGRect)rect{
 2     
 3     //Set path line color
 4     [[UIColor redColor] setStroke];
 5     
 6     //draw a straight line
 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     //Here, you can set the line as dashed line. The previous number represents the length of dashed line, and the latter represents the spacing between dashed lines.
12     //[path1 setLineDash:dash count:2 phase:0];
13     [path1 stroke];
14     
15     //Draw broken line
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];When the end point>=2 When, you can close the path.
21     [path stroke];
22     
23     //quadratic Bezier curve 
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     //Cubic Bezier curve method
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     //draw rectangle
36     UIBezierPath *path4 = [UIBezierPath bezierPathWithRect:CGRectMake(250, 200, 100, 100)];
37     [path4 stroke];
38     
39     //Draw an ellipse. If the length and width are equal, the circle is drawn
40     UIBezierPath *path5 = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(150, 300, 100, 60)];
41     [path5 stroke];
42     
43     //Draw a rectangle with fillets
44     UIBezierPath *path6 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(30, 250, 100, 100) cornerRadius:10];
45     [path6 stroke];
46     
47     //Draw a rectangle and specify a corner as a fillet
48     //    UIRectCornerTopLeft   Left upper
49     //    UIRectCornerTopRight  Right upper
50     //    UIRectCornerBottomLeft  Left lower
51     //    UIRectCornerBottomRight  lower right
52     UIBezierPath *path7 = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(30, 400, 100, 100) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(40, 40)];
53     [path7 stroke];
54     
55     //Draw arc
56     //ArcCenter Dot  radius radius  startAngle Starting radian  endAngle End arc clockwise Clockwise or not
57     UIBezierPath *path8 = [UIBezierPath bezierPathWithArcCenter:CGPointMake(200, 450) radius:50 startAngle:0 endAngle:M_PI_2*3 clockwise:YES];
58     [path8 stroke];
59     
60     //Draw fan shape
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];//Set fill color
65     [path9 closePath];//Closing path
66     [path9 fill];//Set fill
67     [path9 stroke];
68 }

If not

-(void)drawRect:(CGRect)rect uses Bezier curve directly in viewDidLoad, as follows:

The drawing of other figures is similar

 1 UIBezierPath *path = [UIBezierPath bezierPath];
 2     [path moveToPoint:CGPointMake(30, 100)];
 3     [path addLineToPoint:CGPointMake(100, 100)];
 4     
 5     //It's used here CAShapeLayer,Personal habits layer Set line width, breakpoint style and connection point style in
 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     //fill color
16     layer.fillColor = [UIColor clearColor].CGColor;
17     //Line fill color
18     layer.strokeColor = [UIColor redColor].CGColor;
19     [self.view.layer addSublayer:layer];

Design sketch: