ios 画圆环进度条

#import <UIKit/UIKit.h>

@interface SNCircleProgressView : UIView
/**
 *  进度值0-1.0之间
 */
@property (nonatomic,assign)CGFloat progressValue;

/**
 *  边宽
 */
@property(nonatomic,assign) CGFloat progressStrokeWidth;

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

/**
 *  进度条轨道颜色
 */
@property(nonatomic,strong)UIColor *progressTrackColor;

@end

#import "SNCircleProgressView.h"

@interface SNCircleProgressView ()
{

    CAShapeLayer *backGroundLayer; //背景图层
    CAShapeLayer *frontFillLayer;      //用来填充的图层
    UIBezierPath *backGroundBezierPath; //背景贝赛尔曲线
    UIBezierPath *frontFillBezierPath;  //用来填充的贝赛尔曲线

}
@end

@implementation SNCircleProgressView
@synthesize progressColor = _progressColor;
@synthesize progressTrackColor = _progressTrackColor;
@synthesize progressValue = _progressValue;
@synthesize progressStrokeWidth = _progressStrokeWidth;
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder]) {
        [self setUp];
    }
    return self;
}
- (instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame])
    {
        [self setUp];

    }
    return self;

}
/**
 *  初始化创建图层
 */
- (void)setUp
{
    //创建背景图层
    backGroundLayer = [CAShapeLayer layer];
    backGroundLayer.fillColor = nil;
    backGroundLayer.frame = self.bounds;

    //创建填充图层
    frontFillLayer = [CAShapeLayer layer];
    frontFillLayer.fillColor = nil;
    frontFillLayer.frame = self.bounds;

    [self.layer addSublayer:backGroundLayer];
    [self.layer addSublayer:frontFillLayer];
}

- (void)setProgressColor:(UIColor *)progressColor
{
    _progressColor = progressColor;
    frontFillLayer.strokeColor = progressColor.CGColor;
}
- (UIColor *)progressColor
{
    return _progressColor;
}
- (void)setProgressTrackColor:(UIColor *)progressTrackColor
{
    _progressTrackColor = progressTrackColor;
    backGroundLayer.strokeColor = progressTrackColor.CGColor;
    backGroundBezierPath = [UIBezierPath bezierPathWithArcCenter:self.center radius:(CGRectGetWidth(self.bounds)-self.progressStrokeWidth)/.f startAngle: endAngle:M_PI*
                                                       clockwise:YES];
    backGroundLayer.path = backGroundBezierPath.CGPath;
}
- (UIColor *)progressTrackColor
{
    return _progressTrackColor;
}
- (void)setProgressValue:(CGFloat)progressValue
{
    _progressValue = progressValue;
    frontFillBezierPath = [UIBezierPath bezierPathWithArcCenter:self.center radius:(CGRectGetWidth(self.bounds)-self.progressStrokeWidth)/.f startAngle:-M_PI_4 endAngle:(*M_PI)*progressValue-M_PI_4 clockwise:YES];
    frontFillLayer.path = frontFillBezierPath.CGPath;
}
- (CGFloat)progressValue
{
    return _progressValue;
}
- (void)setProgressStrokeWidth:(CGFloat)progressStrokeWidth
{
    _progressStrokeWidth = progressStrokeWidth;
    frontFillLayer.lineWidth = progressStrokeWidth;
    backGroundLayer.lineWidth = progressStrokeWidth;
}
- (CGFloat)progressStrokeWidth
{
    return _progressStrokeWidth;
}
@end

#import "ViewController.h"
#import "SNCircleProgressView.h"
@interface ViewController ()
{
  SNCircleProgressView *progressView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    progressView = [[SNCircleProgressView alloc]initWithFrame:CGRectMake(,, , )];

    progressView.progressColor = [UIColor redColor];
    progressView.progressStrokeWidth = .f;
    progressView.progressTrackColor = [UIColor whiteColor];

    [self.view addSubview:progressView];

    [NSTimer scheduledTimerWithTimeInterval:.f target:self selector:@selector(changeProgressValue) userInfo:nil repeats:YES];

}
- (void)changeProgressValue
{
    progressView.progressValue += 0.1;
    if (progressView.progressValue>=.f) {
        progressView.progressValue = 0.1f;
    }
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end