一、是这个进度条的进度颜色变化，这里思路还是比较清晰的，直接用layer的mask来做就可以。

二、第二点就是这个各各条条的高度不一致又没有规律可言，在各个方法中我最终选择用随机数来做。

  好了思路清晰了，那就开始撸代码了。

首先创建一个View CYXAudioProgressView

@interface CYXAudioProgressView : UIView//无动画设置 进度@property (assign, nonatomic) CGFloat persentage;//有动画设置 进度 0~1-(void)setAnimationPersentage:(CGFloat)persentage;/** 初始化layer 在完成frame赋值后调用一下 */-(void)initLayers;@end

成员变量及初始化方法

/*条条间隙*/#define kDrawMargin 4#define kDrawLineWidth 8/*差值*/#define differenceValue 51@interface CYXAudioProgressView ()/*条条 灰色路径*/@property (nonatomic,strong) CAShapeLayer *shapeLayer;/*背景黄色*/@property (nonatomic,strong) CAShapeLayer *backColorLayer;@property (nonatomic,strong) CAShapeLayer *maskLayer;@end@implementation CYXAudioProgressView-(instancetype)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor blackColor]; [self.layer addSublayer:self.shapeLayer]; [self.layer addSublayer:self.backColorLayer]; self.persentage = 0.0; } return self;}

画图方法：

/** 初始化layer 在完成frame赋值后调用一下 */-(void)initLayers{ [self initStrokeLayer]; [self setBackColorLayer];}

绘制路径

/*路径*/-(void)initStrokeLayer{ UIBezierPath *path = [UIBezierPath bezierPath]; CGFloat maxWidth = self.frame.size.width; CGFloat drawHeight = self.frame.size.height; CGFloat x = 0.0; while (x+kDrawLineWidth<=maxWidth) { CGFloat random =5+ arc4random()%differenceValue;//差值在1-50 之间取 NSLog(@"%f",random); [path moveToPoint:CGPointMake(x-kDrawLineWidth/2, random)]; [path addLineToPoint:CGPointMake(x-kDrawLineWidth/2, drawHeight-random)]; x+=kDrawLineWidth; x+=kDrawMargin; } self.shapeLayer.path = path.CGPath; self.backColorLayer.path = path.CGPath;}

设置mask来显示黄色路径

/*设置masklayer*/-(void)setBackColorLayer{ UIBezierPath *path = [UIBezierPath bezierPath]; [path moveToPoint:CGPointMake(0, self.frame.size.height/2)]; [path addLineToPoint:CGPointMake(self.frame.size.width, self.frame.size.height/2)]; self.maskLayer.frame = self.bounds; self.maskLayer.lineWidth = self.frame.size.width; self.maskLayer.path= path.CGPath; self.backColorLayer.mask = self.maskLayer;}

手动设置百分比的两个方法

-(void)setAnimationPersentage:(CGFloat)persentage{ CGFloat startPersentage = self.persentage; [self setPersentage:persentage]; CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"]; pathAnimation.duration = 1; pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; pathAnimation.fromValue = [NSNumber numberWithFloat:startPersentage]; pathAnimation.toValue = [NSNumber numberWithFloat:persentage]; pathAnimation.autoreverses = NO; pathAnimation.delegate = self; [self.maskLayer addAnimation:pathAnimation forKey:@"strokeEndAnimation"];}/** * 在修改百分比的时候，修改遮罩的大小 * * @param persentage 百分比 */- (void)setPersentage:(CGFloat)persentage { _persentage = persentage; self.maskLayer.strokeEnd = persentage;}

最终使用

- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.view.backgroundColor = [UIColor whiteColor]; self.loopProgressView.frame =CGRectMake(0, 100, self.view.frame.size.width, 150); [self.loopProgressView initLayers]; [self.view addSubview:self.loopProgressView]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [self.loopProgressView setAnimationPersentage:0.5]; }); self.slider.frame = CGRectMake(30, self.view.frame.size.height-60, self.view.frame.size.width-30*2, 20); [self.view addSubview:self.slider];}