iPhone:如何在独立于音量设置的情况下大声播放本地通知声音? [英] iPhone: How to play local notification sound loud independent of volume setting?

问题描述

FoneHome iPhone 应用程序具有一项功能，您可以在其中播放声音作为本地通知的一部分.无论 iPhone 的音量设置为多少，声音都很大.

The FoneHome iPhone app has a feature where you can play a sound as part of a local notification. That sound is loud regardless of what the iPhone's volume level is set at.

如何获得本地通知(或推送)以播放与当前 iPhone 音量无关的大声音频警报?我尝试将 soundName 设置为 WAV 文件，但它会以任何当前音量播放，而且我看不到其他设置选项.

How is it possible to get a local notification (or push) to play an audio alert that is loud independent of what the current iPhone volume level is? I tried just setting the soundName to a WAV file but it plays at whatever the current volume is, and I see no options to set it otherwise.

推荐答案

尝试使用以下代码

NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/audiofile.mp3", [[NSBundle mainBundle] resourcePath]]];
NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
[audioPlayer setVolume:x];
if (audioPlayer == nil)
    NSLog([error description]);             
else 
    [audioPlayer play];

这里的x"是一个浮点值，通常范围从 0.0 到 1.0.但是，要增加音量级别，请指定 x 值 >10.0.但这样做可能会使声音有点失真.

Here 'x' is a floating point value which normally ranges from 0.0 to 1.0. However to increase the Volume level assign x value >10.0. But doing this may distort the sound a bit.

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