1 //
 2 //  ViewController.m
 3 //  twelve
 4 //
 5 //  Created by yuency on 17/4/2.
 6 //  Copyright ? 2017年 yuency. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 
11 #define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)
12 
13 
14 @interface ViewController ()
15 
16 @end
17 
18 @implementation ViewController
19 
20 - (void)viewDidLoad {
21     [super viewDidLoad];
22 
23 
24 //12等分, 每个环的角度是 30°, 在这个30°中再分显示的部分和隐藏的部分
25     
26 #warning 修改等分数
27     NSInteger equalCount = 12;
28 #warning 有色区域占的比例
29     CGFloat visiableProportion = .9f;
30     
31     
32     //计算等分的角度
33     CGFloat equalAngle = 360 / equalCount;
34     //计算可见区域的角度
35     CGFloat visiableAngle = equalAngle * visiableProportion;
36     //连接成为一条曲线
37     UIBezierPath *circlePath = [UIBezierPath bezierPath];
38     for (int i = 0; i < 12; i ++) {
39         CGFloat startAngle = (i * equalAngle);
40         CGFloat endAngle = (visiableAngle + i * equalAngle);
41         UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0) radius:200 / 2.f startAngle:DEGREES_TO_RADIANS(startAngle)  endAngle:DEGREES_TO_RADIANS(endAngle) clockwise:YES];
42         [circlePath appendPath:path];
43     }
44     //创建形状
45     CAShapeLayer *circleLayer = [CAShapeLayer layer];
46     circleLayer.path = circlePath.CGPath;
47     circleLayer.strokeColor   = [UIColor magentaColor].CGColor;
48     circleLayer.fillColor     = [UIColor clearColor].CGColor;
49     circleLayer.lineWidth     = 10.0f;
50     circleLayer.strokeStart   = 0.0f;
51     circleLayer.strokeEnd     = 1.0f;
52     circleLayer.position = self.view.center;
53     [self.view.layer addSublayer:circleLayer];
54     
55     
56     
57     //参考线
58     UIView *vvv = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 400, 1)];
59     vvv.backgroundColor = [UIColor redColor];
60     vvv.center = self.view.center;
61     [self.view addSubview:vvv];
62     UIView *mmm = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 700)];
63     mmm.backgroundColor = [UIColor redColor];
64     mmm.center = self.view.center;
65     [self.view addSubview:mmm];
66 }
67 
68 
69 @end