前幾天開發群里有一個老兄問了一個開發問題，他們的需求是要做一個類似音頻進度條的東西，我感覺設計還不錯，于是就寫了個小demo供大家參考，在爭得了他的同意的情況下寫下這篇文章。
話不多說先上效果圖
看到這個效果的時候我感覺相對比較難的點有兩點：
一、是這個進度條的進度顏色變化，這里思路還是比較清晰的，直接用layer的mask來做就可以。
二、第二點就是這個各各條條的高度不一致又沒有規律可言，在各個方法中我最終選擇用隨機數來做。
好了思路清晰了，那就開始擼代碼了。
首先創建一個View CYXAudioProgressView
@interface CYXAudioProgressView : UIView//無動畫設置 進度@property (assign, nonatomic) CGFloat persentage;//有動畫設置 進度 0~1-(void)setAnimationPersentage:(CGFloat)persentage;/** 初始化layer 在完成frame賦值后調用一下 */-(void)initLayers;@end
成員變量及初始化方法
/*條條間隙*/#define kDrawMargin 4#define kDrawLineWidth 8/*差值*/#define differenceValue 51@interface CYXAudioProgressView ()<CAAnimationDelegate>/*條條 灰色路徑*/@property (nonatomic,strong) CAShapeLayer *shapeLayer;/*背景黃色*/@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;}畫圖方法：
/** 初始化layer 在完成frame賦值后調用一下 */-(void)initLayers{ [self initStrokeLayer]; [self setBackColorLayer];}繪制路徑
/*路徑*/-(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 之間取 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;}設置mask來顯示黃色路徑
/*設置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;}手動設置百分比的兩個方法
-(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"];}/** * 在修改百分比的時候，修改遮罩的大小 * * @param persentage 百分比 */- (void)setPersentage:(CGFloat)persentage { _persentage = persentage; self.maskLayer.strokeEnd = persentage;}最終使用
- (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];}以上就簡單的實現了上述效果，有問題歡迎指教。
Demo: https://github.com/SionChen/CYXAudioProgressView
總結
以上所述是小編給大家介紹的iOS實現音頻進度條效果，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對VEVB武林網網站的支持！
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