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GYSpectrumiOS音频频谱，仿QQ录音频谱
先上效果图：
示例用法：
SpectrumView * spectrumView = [[SpectrumView alloc] initWithFrame:CGRectMake(CGRectGetMidX(self.view.frame) - 100,180,200, 40.0)]; spectrumView.text = [NSString stringWithFormat:@'%d',0]; __weak SpectrumView * weakWaver = spectrumView; spectrumView.itemLevelCallback = ^() { [self.audioRecorder updateMeters]; //取得第一个通道的音频，开题报告，音频强度范围是-160到0 float power = [self.audioRecorder averagePowerForChannel:0]; weakWaver.level = power; }; [self.view addSubview:spectrumView];使用前请注意：
SpectrumView.frame.size.width / SpectrumView.numberOfItems >= 5 默认SpectrumView.numberOfItems = 20 (可修改，必须为偶数)，所以SpectrumView.frame.size.width默认要大于100 例如：SpectrumView * spectrumView = [[SpectrumView alloc] initWithFrame:CGRectMake(0,0,100,40)];，论文
