功能如下图，中间小红点可自定义是否存在，我在项目中主要用于指定一个时间。比如我指定到10点，我需要让线指向10 ，然后再做其他的事情。所以就研究出了这种时间圆盘，主要运用贝塞尔曲线和画直线来解决这个问题demo地址 http://code.cocoachina.com/view/137396
需要的可以直接复制粘贴到项目的一个VC里即可看到该效果，也可以改成类似于这种效果的自己需要的效果。
//
// YuanHuanVController.m
// SwiftFirstAPP
//
// Created by 嗯，大葱 on 2018/7/11.
// Copyright © 2018年 嗯，大葱. All rights reserved.
//
#import "YuanHuanVController.h"
@interface YuanHuanVController ()
{
float radius; //半径
UIView *baseView;
UIView *bgV;
UIImageView *imageView;
NSString *tempStr;//点击的时间
}
@end
@implementation YuanHuanVController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
bgV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 400, 350)];
bgV.backgroundColor =[UIColor groupTableViewBackgroundColor];
//可改变整个圆盘的大小
baseView = [[UIView alloc] initWithFrame:CGRectMake(100, 70, 200, 200)];
baseView.backgroundColor = [UIColor clearColor];
[bgV addSubview:baseView];
[self.view addSubview:bgV];
//设置圆心，根据需求，可有可无
UIView *centerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
centerView.center = baseView.center;
centerView.backgroundColor = [UIColor redColor];
[self.view addSubview:centerView];
//M_PI的值
//0 *M_PI 在最右边
//0.5 *M_PI最下边
//M_PI 最左边
//1.5M_PI 最上边
//下面注释掉的代码是根绝部分规律排列数字按钮，但是钟表类的12 3 6 9都是在水平直角上的，所以我拉出来单独绘制每个数字按钮，过程比较繁琐，但是基本都相等，就是改一点间距大小。
// CGFloat angle=0;
//
// while (angle <=1.82) {
[self createCircleButtonWithAngle:0*M_PI numS:@"3"];
[self createCircleButtonWithAngle:0.165*M_PI numS:@"4"];
[self createCircleButtonWithAngle:0.325*M_PI numS:@"5"];
[self createCircleButtonWithAngle:0.5*M_PI numS:@"6"];
[self createCircleButtonWithAngle:0.665*M_PI numS:@"7"];
[self createCircleButtonWithAngle:0.825*M_PI numS:@"8"];
[self createCircleButtonWithAngle:1*M_PI numS:@"9"];
[self createCircleButtonWithAngle:1.165*M_PI numS:@"10"];
[self createCircleButtonWithAngle:1.325*M_PI numS:@"11"];
[self createCircleButtonWithAngle:1.5*M_PI numS:@"12"];
[self createCircleButtonWithAngle:1.665*M_PI numS:@"1"];
[self createCircleButtonWithAngle:1.825*M_PI numS:@"2"];
// angle = angle + 0.16;
// }
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//创建圆上指定角度对应的按钮
- (void)createCircleButtonWithAngle:(CGFloat)angle numS:(NSString *)numStr;
{
radius = baseView.frame.size.width/2; //半径
CGFloat x = radius*cos(angle);
CGFloat y = radius*sin(angle);
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 35, 35)];
btn.center = CGPointMake(radius+x, radius+y);
btn.backgroundColor = [UIColor groupTableViewBackgroundColor];
[btn setTitle:numStr forState:(UIControlStateNormal)];
[btn setTitleColor:[UIColor blackColor] forState:(UIControlStateNormal)];
[btn setTitleColor:[UIColor whiteColor] forState:(UIControlStateSelected)];
btn.layer.cornerRadius = btn.frame.size.width/2;
btn.tag = [numStr intValue];
[btn addTarget:self action:@selector(handleChooseTimeAction:) forControlEvents:(UIControlEventTouchUpInside)];
[baseView addSubview:btn];
}
//选择的时间
- (void)handleChooseTimeAction:(UIButton *)sender {
tempStr = sender.titleLabel.text;
[self linkVlong:sender.frame.origin.x wid:sender.frame.origin.y];
for (int i = 1; i < 13; i++) {
UIButton *btn = (UIButton *)[self.view viewWithTag:i];
if (i == sender.tag) {
btn.selected = YES;
[btn setBackgroundColor:[UIColor greenColor]];
}else {
[btn setBackgroundColor:[UIColor groupTableViewBackgroundColor]];
btn.selected = NO;
}
}
}
- (void)linkVlong:(CGFloat)xT wid:(CGFloat)yt {
if (imageView) {
[imageView removeFromSuperview];
}
imageView=[[UIImageView alloc] initWithFrame:baseView.frame];
[bgV addSubview:imageView];
// baseView.backgroundColor = [UIColor blueColor];
UIGraphicsBeginImageContext(imageView.frame.size);
[imageView.image drawInRect:CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 1.0); //线宽
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 2.0, 0.0, 1.0, 1.0); //颜色
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), baseView.frame.size.width/2, baseView.frame.size.height/2); //起点坐标
// xT+17.5, yt+17.5 每个点的正中间
if ([tempStr intValue] == 12) {
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5, 17.5); //终点坐标
}else if ([tempStr intValue] == 1){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5-10, yt+17.5*2-2); //终点坐标
}else if ([tempStr intValue] ==2){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT, yt+17.5*2-10); //终点坐标
}else if ([tempStr intValue] ==3){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT-2, yt+17.5*2-18); //终点坐标
}
else if ([tempStr intValue] ==4){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT, yt+17.5-6); //终点坐标
}
else if ([tempStr intValue] ==5){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+5, yt+3); //终点坐标
}
else if ([tempStr intValue] ==6){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5, yt-1); //终点坐标
}
else if ([tempStr intValue] ==7){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5+9, yt+2); //终点坐标
}
else if ([tempStr intValue] ==8){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5*2-1, yt+17.5-6); //终点坐标
}
else if ([tempStr intValue] ==9){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5*2-1,yt+17.5*2-17); //终点坐标
}
else if ([tempStr intValue] ==10){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5*2-1,yt+17.5*2-10); //终点坐标
}
else if ([tempStr intValue] ==11){
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), xT+17.5*2-6,yt+17.5*2-5); //终点坐标
}
CGContextStrokePath(UIGraphicsGetCurrentContext());
imageView.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
@end