前几天开发群里有一个老兄问了一个开发问题，他们的需求是要做一个类似音频进度条的东西，我感觉设计还不错，于是就写了个小demo供大家参考，在争得了他的同意的情况下写下这篇文章。

话不多说先上效果图

看到这个效果的时候我感觉相对比较难的点有两点：

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

@H_502_19@ @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

@H_502_19@ /*条条间隙*/ #define kDrawMargin 4 #define kDrawLineWidth 8 /*差值*/ #define differenceValue 51 @interface CYXAudioProgressView ()<CAAnimationDelegate> /*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：

@H_502_19@ /** 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

@H_502_19@ /*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

@H_502_19@ /*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

@H_502_19@ -(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

@H_502_19@ - (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]; }

以上就简单的实现了上述效果，有问题欢迎指教。

Demo: https://github.com/SionChen/CYXAudioProgressView

总结

以上所述是小编给大家介绍的iOS实现音频进度条效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！