//
// SKVoiceWaveView.m
// SKVoiceWave
//
//
#import "SKVoiceWaveView.h"
#import "SKVoiceFilter.h"
#import "SKVoiceProvider.h"
@interface SKVoiceWaveView()
@property(nonatomic,strong)SKVoiceFilter *filter;
@property(nonatomic,strong)UIActivityIndicatorView *loadingView;
@end
@implementation SKVoiceWaveView
-(instancetype)initWithFrame:(CGRect)frame{
if (self = [super initWithFrame:frame]) {
[self setConfig];
}
return self;
}
//加载等待视图
-(void)setConfig{
self.lineWidth = 0;
self.lineDistance = 4;
self.lineColor = [UIColor redColor];
self.filter = [[SKVoiceFilter alloc]init];
self.loadingView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.loadingView.center = CGPointMake(self.bounds.size.width / 2., self.bounds.size.height / 2.);
[self addSubview:self.loadingView];
[self.loadingView startAnimating];
}
-(void)setAsset:(AVAsset *)asset{
if (!asset) {
NSLog(@"路径asset错误");
[self.loadingView stopAnimating];
return;
}
[SKVoiceProvider loadAudioSamplesFormAsset:asset completionBlock:^(NSData *data) {
if (data) {
self.filter.data = data;
}else{
NSLog(@"读取音频文件失败");
}
[self.loadingView stopAnimating];
[self setNeedsDisplay];
}];
}
-(void)setUrl:(NSURL *)url{
if (!url) {
NSLog(@"路径url错误");
[self.loadingView stopAnimating];
return;
}
_url = url;
self.asset = [AVAsset assetWithURL:_url];
}
-(void)setPath:(NSString *)path{
if (!path) {
NSLog(@"路径path错误");
[self.loadingView stopAnimating];
return;
}
_path = path;
self.url = [NSURL fileURLWithPath:path];
}
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
NSArray *filteredSamples = [self.filter filteredSamplesForSize:self.frame.size];
if (_lineWidth == 0) {
CGFloat midY = CGRectGetMidY(rect);//得到中心y的坐标
CGMutablePathRef halfPath = CGPathCreateMutable(); //绘制路径
CGPathMoveToPoint(halfPath, nil, 0.0f, midY);//在路径上移动当前画笔的位置到一个点，这个点由CGPoint 类型的参数指定。
for (NSUInteger i = 0; i < filteredSamples.count; i ++) {
float sample = [filteredSamples[i] floatValue];
CGPathAddLineToPoint(halfPath, NULL, i, midY - sample); //从当前的画笔位置向指定位置（同样由CGPoint类型的值指定）绘制线段
NSLog(@"%f",sample);
}
CGPathAddLineToPoint(halfPath, NULL, filteredSamples.count, midY); //重置起点
//实现波形图反转
CGMutablePathRef fullPath = CGPathCreateMutable();//创建新路径
CGPathAddPath(fullPath, NULL, halfPath); //合并路径
CGAffineTransform transform = CGAffineTransformIdentity; //反转
//反转配置
transform = CGAffineTransformTranslate(transform, 0, CGRectGetHeight(rect));
transform = CGAffineTransformScale(transform, 1.0, -1.0);
CGPathAddPath(fullPath, &transform, halfPath);//将路径添加到上下文中
CGContextAddPath(context, fullPath);
//绘制颜色
CGContextSetFillColorWithColor(context, self.lineColor.CGColor);
//开始绘制
CGContextDrawPath(context, kCGPathFill);//移除
CGPathRelease(halfPath);
CGPathRelease(fullPath);
}else{
int count = self.frame.size.width / (self.lineWidth + self.lineDistance);
NSMutableArray *filterMuArr = @[].mutableCopy;
if (count >= filteredSamples.count) {
filterMuArr = filteredSamples.mutableCopy;
}else{
int index = (int)filteredSamples.count / count;
CGContextSetLineWidth(context, self.lineWidth);//线的宽度
CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor);
for (int i = 0; i < count; i ++) {
[filterMuArr addObject:filteredSamples[i * index]];
NSInteger lineHeight = [filteredSamples[i * index] floatValue];
CGContextMoveToPoint(context, i * (self.lineWidth + self.lineDistance), (self.frame.size.height - lineHeight) / 2.f);
CGContextAddLineToPoint(context, i * (self.lineWidth + self.lineDistance), self.frame.size.height - (self.frame.size.height - lineHeight) / 2.f);
CGContextDrawPath(context, kCGPathStroke);
}
}
}
}
@end
