iOS-把一個圓環12等分(任意等分)

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把一個圓環12等分(任意等分)

 

 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 @end17 18 @implementation ViewController19 20 - (void)viewDidLoad {21     [super viewDidLoad];22 23 24 //12等分, 每個環的角度是 30°, 在這個30°中再分顯示的部分和隱藏的部分25     26 #warning 修改等分數27     NSInteger equalCount = 12;28 #warning 有色地區占的比例29     CGFloat visiableProportion = .9f;30     31     32     //計算等分的角度33     CGFloat equalAngle = 360 / equalCount;34     //計算可見地區的角度35     CGFloat visiableAngle = equalAngle * visiableProportion;36     //串連成為一條曲線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     //建立形狀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     //輔助線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

 

iOS-把一個圓環12等分(任意等分)