#import 
     
      @interface ProgressView : UIView@property(nonatomic,assign)CGFloat progress;@property(nonatomic,strong)UIColor *layColor;@end#import "ProgressView.h"@interface ProgressView (){    CALayer *progressLayer;        CGFloat currentViewWidth;//当前view的宽度}@end@implementation ProgressView@synthesize progress=_progress;@synthesize layColor=_layColor;- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        progressLayer=[CALayer layer];        progressLayer.frame=CGRectMake(0, 0, 0, frame.size.height);        progressLayer.backgroundColor=[UIColor redColor].CGColor;        [self.layer addSublayer:progressLayer];        currentViewWidth=frame.size.width;    }    return self;}-(void)setProgress:(CGFloat)progress{    _progress=progress;    if (progress<=0) {        progressLayer.frame=CGRectMake(0, 0, 0, self.frame.size.height);    }    else if (progress<=1)    {        progressLayer.frame=CGRectMake(0, 0, progress*currentViewWidth, self.frame.size.height);    }    else    {      progressLayer.frame=CGRectMake(0, 0, currentViewWidth, self.frame.size.height);    }    }-(CGFloat)progress{    return _progress;}-(void)setLayColor:(UIColor *)layColor{    _layColor=layColor;    self.layer.backgroundColor=layColor.CGColor;}-(UIColor *)layColor{    return _layColor;}@end
     

#import "ViewController.h"#import "ProgressView.h"@interface ViewController ()@property(nonatomic,strong)ProgressView *progressView;@property(nonatomic,strong)NSTimer *timer;@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    self.progressView=[[ProgressView alloc]initWithFrame:CGRectMake(20, 20, 290, 3)];    [self.view addSubview:self.progressView];    _timer=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(layerAnimation) userInfo:nil repeats:YES];        }-(void)layerAnimation{    self.progressView.progress=arc4random()%100/100.0f;    self.progressView.layColor=[UIColor greenColor];}@end