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)/2.f startAngle:0 endAngle:M_PI*2                                                       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)/2.f startAngle:-M_PI_4 endAngle:(2*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(40,80, 100, 100)];       progressView.progressColor = [UIColor redColor];    progressView.progressStrokeWidth = 5.f;    progressView.progressTrackColor = [UIColor whiteColor];        [self.view addSubview:progressView];        [NSTimer scheduledTimerWithTimeInterval:1.f target:self selector:@selector(changeProgressValue) userInfo:nil repeats:YES];    }- (void)changeProgressValue{    progressView.progressValue += 0.1;    if (progressView.progressValue>=1.f) {        progressView.progressValue = 0.1f;    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end