利用CAShapeLayer和贝塞尔曲线来画一个圆环进度条，其实很简单，在此只做记录使用。

效果如下所示:

截屏2021-01-19 下午5.19.43.png

直接上代码.h头文件

@interface SGYProgressView : UIView

/// 初始化方法
/// @param frame 圆形环的绘制区域
/// @param trackWidth 圆形环的宽度
- (instancetype)initWithFrame:(CGRect)frame trackWidth:(CGFloat)trackWidth NS_DESIGNATED_INITIALIZER;

- (instancetype)init NS_UNAVAILABLE;
- (instancetype)initWithFrame:(CGRect)frame NS_UNAVAILABLE;
- (nullable instancetype)initWithCoder:(NSCoder *)coder NS_UNAVAILABLE;

@property (nonatomic, strong) UIColor          *progressColor;  //进度条颜色
@property (nonatomic, strong) UIColor          *progressBgColor;  //进度条背景颜色

@property (nonatomic,assign)CGFloat progress;  // 0.0 .. 1.0, default is

- (void)setProgress:(CGFloat)progress animated:(BOOL)animated;

/// 设置进度条
/// @param progress 进度条百分比
/// @param animated 是否开启动画
/// @param startAngle 起始角度
/// @param clockwise 进度条方向(是否顺时针)
- (void)setProgress:(CGFloat)progress animated:(BOOL)animated startAngle:(CGFloat )startAngle clockwise:(BOOL)clockwise;

@end

.m实现文件

#import "SGYProgressView.h"

@interface SGYProgressView ()
@property (nonatomic, strong) CAShapeLayer *backgroundLayer;      //背景图层
@property (nonatomic, strong) CAShapeLayer *frontFillLayer;       //用来填充的图层

@property (nonatomic, assign) CGFloat      trackWidth;    //导轨宽度
@property (nonatomic, assign) CGFloat      width;        //圆环宽度

@end

@implementation SGYProgressView

#pragma mark -- initialization 初始化
- (instancetype)initWithFrame:(CGRect)frame trackWidth:(CGFloat)trackWidth
{
    if (self = [super initWithFrame:frame])
    {
        _trackWidth = trackWidth;
        _width = frame.size.width;
        
        [self setupSubviews];
    }
    return self;

}

#pragma mark -- setupSubviews 创建子视图
- (void)setupSubviews
{
    //创建背景图层
    _backgroundLayer = [CAShapeLayer layer];
    _backgroundLayer.fillColor = nil;

    //创建填充图层
    _frontFillLayer = [CAShapeLayer layer];
    _frontFillLayer.fillColor = nil;
    _frontFillLayer.lineCap = kCALineCapRound;
    [self.layer addSublayer:_backgroundLayer];
    [self.layer addSublayer:_frontFillLayer];
    
    //设置颜色
    _frontFillLayer.strokeColor  = [UIColor colorWithRed:218/255.0 green:165/255.0 blue:32/255.0 alpha:1.0].CGColor;
    _backgroundLayer.strokeColor = [UIColor lightGrayColor].CGColor;
  
}

-(void)layoutSubviews {

    [super layoutSubviews];
    
    CGFloat width = self.width;
    UIBezierPath *backgroundBezierPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(width/2.0f, width/2.0f) radius:(CGRectGetWidth(self.bounds)- self.trackWidth)/2.f startAngle:0 endAngle:M_PI*2
                                                       clockwise:YES];
    _backgroundLayer.path = backgroundBezierPath.CGPath;
    
    //设置线宽
    _frontFillLayer.lineWidth = self.trackWidth;
    _backgroundLayer.lineWidth = self.trackWidth;
}

#pragma mark -- setter方法
- (void)setProgressColor:(UIColor *)progressColor{
    
    _progressColor              = progressColor;
    _frontFillLayer.strokeColor = progressColor.CGColor;
}

- (void)setProgressBgColor:(UIColor *)progressBgColor{
    
    _progressBgColor             = progressBgColor;
    _backgroundLayer.strokeColor = progressBgColor.CGColor;
}

- (void)setProgress:(CGFloat)progress
{
    [self setProgress:progress animated:NO startAngle:-M_PI_2 clockwise:NO];

}

- (void)setProgress:(CGFloat)progress animated:(BOOL)animated{
    
    [self setProgress:progress animated:animated startAngle:-M_PI_2 clockwise:NO];
}

- (void)setProgress:(CGFloat)progress animated:(BOOL)animated startAngle:(CGFloat )startAngle clockwise:(BOOL)clockwise{
    progress = MAX( MIN(progress, 1.0), 0.0);
     _progress = progress;
    CGFloat width = self.width;

    CGFloat endAngle = startAngle + (clockwise?(2*M_PI)*progress:(-2*M_PI)*progress);
    UIBezierPath *frontFillBezierPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(width/2.0f, width/2.0f) radius:(CGRectGetWidth(self.bounds)-self.trackWidth)/2.f startAngle:startAngle endAngle:endAngle clockwise:clockwise];
    _frontFillLayer.path = frontFillBezierPath.CGPath;
    if (animated) {
        CABasicAnimation *basicAnimation=[CABasicAnimation animationWithKeyPath:@"strokeEnd"];
        basicAnimation.duration = 0.75;//动画时间
        basicAnimation.fromValue=[NSNumber numberWithInteger:0];
        basicAnimation.toValue=[NSNumber numberWithInteger:1];
        [_frontFillLayer addAnimation:basicAnimation forKey:@"strokeKey"];
    }
}

@end

使用方法

     _progressView = [[SGYProgressView alloc]initWithFrame:CGRectMake(120, 150, 150, 100) trackWidth:6];
//    _progressView.progressColor = [UIColor redColor];
    _progressView.progressBgColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.6];
    [_progressView setProgress:0.72 animated:YES startAngle:2 clockwise:YES];
    [self.view addSubview:_progressView];