监控iPhone麦克风 [英] Monitor iPhone mic

问题描述

我正在使用 SCListener 获取iPhone的音量，但我想放一个卷上的观察者。所以当它改变时我可以更新屏幕上的音量表。但做类似的事情：

I'm using SCListener to get the iPhone's volume, but I'd like to put an observer on the volume. So when it changes I can update the volume meter on the screen. But doing something like:

SCListener *listener = [SCListener sharedListener];
[listener addObserver:self 
           forKeyPath:@"peakPower" 
              options:NSKeyValueObservingOptionOld 
              context:NULL];

不起作用，因为peakPower不是变量。我如何将观察者放在函数上？或者如何创建一个我可以停止并开始跟踪变量的峰值功率，我可以将观察者放在哪里？

doesn't do the trick because peakPower isn't a variable. How would I put an observer on the function? Or how would a create a listener I could stop and start to keep track of the peak power in a variable I could put an observer on?

在此先感谢您的帮助！

推荐答案

只需设置重复计时器，并在每次计时器触发时读取等级。

Simply set up a repeating timer, and read the levels each time the timer fires.

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