https://stackoverflow.com/q/67218812/1271826

CircleView.m

//  CircleView.h
//
//  Created by Robert Ryan on 4/24/21.

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

IB_DESIGNABLE
@interface CircleView : UIView

@property (nonatomic) IBInspectable CGFloat startAngle;
@property (nonatomic) IBInspectable CGFloat endAngle;
@property (nonatomic) IBInspectable CGFloat percent;
@property (nonatomic) IBInspectable CGFloat lineWidth;
@property (nonatomic) IBInspectable UIColor *mainColor;
@property (nonatomic) IBInspectable UIColor *progressColor;

@end

NS_ASSUME_NONNULL_END

// and
    
//
//  CircleView.m
//
//  Created by Robert Ryan on 4/24/21.

#import "CircleView.h"

@implementation CircleView

- (instancetype)initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (self) {
        [self configure];
    }
    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self configure];
    }
    return self;
}

- (void)configure {
    _lineWidth = 1;
    _percent = 0;
    _mainColor = [UIColor lightGrayColor];
    _progressColor = [UIColor darkGrayColor];
    _startAngle = -M_PI_2;
    _endAngle = M_PI_2 * 3;
}

- (void)drawRect:(CGRect)rect {
    int radius = (self.bounds.size.width - self.lineWidth) / 2;                                     // inset by line width
    CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidX(self.bounds));           // use `bounds` and `CGRectGetMidX`
    CGFloat progressEndAngle = self.startAngle + (self.endAngle - self.startAngle) * self.percent;  // by convention, percentages are b/w 0 and 1

    UIBezierPath* bezierPathPassive = [UIBezierPath bezierPathWithArcCenter:center
                                                                     radius:radius
                                                                 startAngle:0
                                                                   endAngle:M_PI * 2                // in iOS, use radians
                                                                  clockwise:YES];
    bezierPathPassive.lineWidth = self.lineWidth;
    [self.mainColor setStroke];
    [bezierPathPassive stroke];

    UIBezierPath* bezierPathProgress = [UIBezierPath bezierPathWithArcCenter:center
                                                                      radius:radius
                                                                  startAngle:self.startAngle
                                                                    endAngle:progressEndAngle
                                                                   clockwise:YES];
    bezierPathProgress.lineWidth = self.lineWidth;
    [self.progressColor setStroke];
    [bezierPathProgress stroke];
}

- (void)setStartAngle:(CGFloat)startAngle {
    _startAngle = startAngle;
    [self setNeedsDisplay];
}

- (void)setEndAngle:(CGFloat)endAngle {
    _endAngle = endAngle;
    [self setNeedsDisplay];
}

- (void)setPercent:(CGFloat)percent {
    _percent = percent;
    [self setNeedsDisplay];
}

- (void)setMainColor:(UIColor *)mainColor {
    _mainColor = mainColor;
    [self setNeedsDisplay];
}

- (void)setProgressColor:(UIColor *)progressColor {
    _progressColor = progressColor;
    [self setNeedsDisplay];
}

@end

That yields (with progress set to 0.33):