屏幕锁定时如何使用AVAudioPlayer播放音乐 [英] how to play music using AVAudioPlayer when screen os locked

问题描述

锁定屏幕后，我需要使用AVAudioPlayer播放简单的声音.我该怎么办

i need to play a simple sound using AVAudioPlayer when screen is locked .How can I do that please help

推荐答案

首先:在您的项目中添加以下框架

First: Add following frameworks into your project

AudioToolbox， CoreAudio， 媒体播放器 AVFoundation.

AudioToolbox, CoreAudio, MediaPlayer AVFoundation.

第二:将您的info.plist文件添加为新密钥

Second: Add your info.plist file a new key

所需的背景模式=应用播放音频

Required background modes = App plays audio

第三步:创建一个名为keepAwakeForAudio的方法，并在播放音频后立即调用它

Third: Create a method called keepAwakeForAudio and call it just after playing your audio

-(void)keepAwakeForAudio

-(void)keepAwakeForAudio

{ UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback; AudioSessionSetProperty(kAudioSessionProperty_AudioCategory，sizeof(sessionCategory)，& sessionCategory); AudioSessionSetActive(true); }

{ UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback; AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (sessionCategory), &sessionCategory); AudioSessionSetActive(true); }

//////

NSURL * url = [NSURL fileURLWithPath:[NSString stringWithFormat:@％@/rain1_Rain_on_Street.m4a"，[[NSBundle mainBundle] resourcePath]]];

NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/rain1_Rain_on_Street.m4a", [[NSBundle mainBundle] resourcePath]]];

NSError *error;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
audioPlayer.numberOfLoops = -1;

if (audioPlayer == nil)
    NSLog([error description]);


else
    [audioPlayer play];

[self **keepAwakeForAudio**];

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