文章目录
需求分析
1、APP进入后台，防止被杀死；
2、APP在后台时也可以播报TTS；
3、TTS内容是后台通过socket推过来的数据；
实现计划
1、实现类似QQ一样的，APP进入后台，可以在锁屏页面继续播放音乐，而这个时候APP是不会被杀死的；
2、使用socket播放一个静音文件，循环播放；
3、当接收到socket消息时，暂停音乐播放，TTS播报socket消息；
4、TTS播报完毕，继续播放静音文件；
5、禁止掉锁屏页面按钮功能（上一首、下一首、开始、暂停）；
具体实现
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>
@interface ViewController ()<AVSpeechSynthesizerDelegate>
@property (nonatomic, strong)AVPlayer *player;
@property (nonatomic, strong)AVSpeechSynthesizer *synthesizer;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
// 开始播放音乐
[self starPlayMusic];
// 今天播放进度
[self playerPressHandle];
// 开启前后台监听
[self registerAllNotifications];
// 关闭锁屏页面按钮交互
[self createRemoteCommandCenter];
// 模拟socket 接收消息
[self socketReceiveMessage];
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self removeAllNotifications];
MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
[[commandCenter playCommand] removeTarget:self];
[[commandCenter pauseCommand] removeTarget:self];
[[commandCenter nextTrackCommand] removeTarget:self];
[[commandCenter previousTrackCommand] removeTarget:self];
[commandCenter.changePlaybackPositionCommand removeTarget:self];
}
#pragma mark - 模拟socket接收消息
- (void)socketReceiveMessage
{
int number = random() % 180+60;
NSLog(@"%d 秒后 tts播报", number);
dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, (ino64_t)(number * NSEC_PER_SEC));
__weak __typeof__(self) weakSelf = self;
dispatch_after(time, dispatch_get_main_queue(), ^{
[weakSelf pauseMusic];
[weakSelf speekWithString: [NSString stringWithFormat:@"新客户来了 %ld", random() % 100]];
NSLog(@"%f", [[NSDate date] timeIntervalSinceNow]);
[weakSelf socketReceiveMessage];
});
}
#pragma mark - 直接播放音乐
- (void)starPlayMusic
{
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"http://atyk.jzhunk.xyz/v130/upload/1.mp3"]];
[self.player replaceCurrentItemWithPlayerItem:playerItem];
[self playMusic];
}
#pragma mark - 播放进度
- (void)playerPressHandle
{
__weak __typeof__(self) weakSelf = self;
[self.player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(1, NSEC_PER_SEC) queue:NULL usingBlock:^(CMTime time) {
//进度 当前时间/总时间
CGFloat progress = CMTimeGetSeconds(weakSelf.player.currentItem.currentTime) / CMTimeGetSeconds(weakSelf.player.currentItem.duration);
NSLog(@"进度 == %f", progress);
if (progress == 1.0f || progress >= 0.99f) {
NSLog(@"播放完毕");
//播放百分比为1表示已经播放完毕
//循环播放，防止APP被杀死
[weakSelf starPlayMusic];
}
}];
}
#pragma mark - 初始化音乐播放器
- (AVPlayer *)player
{
if (!_player) {
_player = [[AVPlayer alloc] init];
}
return _player;
}
#pragma mark - 初始化tts播放器
-(AVSpeechSynthesizer *)synthesizer
{
if (!_synthesizer) {
_synthesizer = [[AVSpeechSynthesizer alloc]init];
_synthesizer.delegate = self;
}
return _synthesizer;
}
#pragma mark - tts播报
- (void)speekWithString:(NSString *)value
{
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:value];
utterance.pitchMultiplier=0.8;
//中式发音
AVSpeechSynthesisVoice *voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"];
utterance.voice = voice;
[self.synthesizer speakUtterance:utterance];
}
#pragma mark - 处理锁屏页交互
- (void)createRemoteCommandCenter
{
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
// 暂停
MPRemoteCommand *pauseCommand = [commandCenter pauseCommand];
[pauseCommand setEnabled:NO];
[pauseCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
return MPRemoteCommandHandlerStatusSuccess;
}];
// 开始
MPRemoteCommand *playCommand = [commandCenter playCommand];
[playCommand setEnabled:NO];
[playCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
NSLog(@"开始");
return MPRemoteCommandHandlerStatusSuccess;
}];
// 下一首
MPRemoteCommand *nextCommand = [commandCenter nextTrackCommand];
[nextCommand setEnabled:NO];
[nextCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
NSLog(@"下一首");
return MPRemoteCommandHandlerStatusSuccess;
}];
// 上一首
MPRemoteCommand *previousCommand = [commandCenter previousTrackCommand];
[previousCommand setEnabled:NO];
[previousCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
NSLog(@"上一首");
return MPRemoteCommandHandlerStatusSuccess;
}];
// 进度条
MPRemoteCommand *changePlaybackPositionCommand = [commandCenter changePlaybackPositionCommand];
[changePlaybackPositionCommand setEnabled:NO];
[changePlaybackPositionCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
NSLog(@"进度条");
return MPRemoteCommandHandlerStatusSuccess;
}];
}
#pragma mark - 监听APP进入前/后台(处理APP进入后台，音乐播放暂停问题)
- (void)registerAllNotifications
{
// 后台通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(apllicationWillResignActiveNotification:) name:UIApplicationWillResignActiveNotification object:nil];
// 进入前台通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(apllicationWillEnterForegroundNotification:) name:UIApplicationWillEnterForegroundNotification object:nil];
}
#pragma mark - 移除监听
- (void)removeAllNotifications {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillEnterForegroundNotification object:nil];
}
#pragma mark - 进入后台通知
- (void)apllicationWillResignActiveNotification:(NSNotification *)n
{
NSError *error = nil;
// 后台播放代码
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:&error];
if(error) {
NSLog(@"ListenPlayView background error0: %@", error.description);
}
//后台播放
[session setCategory:AVAudioSessionCategoryPlayback error:&error];
if(error) {
NSLog(@"ListenPlayView background error1: %@", error.description);
}
//开启后台处理多媒体事件
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
#pragma mark - 进入前台通知
- (void)apllicationWillEnterForegroundNotification:(NSNotification *)n {
// 进前台 设置不接受远程控制
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}
#pragma mark - 更新锁屏界面信息
- (void)updateLockScreenInfo {
// 1.获取锁屏中心
MPNowPlayingInfoCenter *playingInfoCenter = [MPNowPlayingInfoCenter defaultCenter];
// 初始化一个存放音乐信息的字典
NSMutableDictionary *playingInfoDict = [NSMutableDictionary dictionary];
// 2、设置歌曲名
[playingInfoDict setObject:[NSString stringWithFormat:@"歌曲1111"]
forKey:MPMediaItemPropertyTitle];
[playingInfoDict setObject:[NSString stringWithFormat:@"专辑2222"]
forKey:MPMediaItemPropertyAlbumTitle];
// 3、设置封面的图片
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"image.jpg"]];
if (image) {
MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:image];
[playingInfoDict setObject:artwork forKey:MPMediaItemPropertyArtwork];
}
// 4、设置播放速度
[playingInfoDict setObject:@(_player.rate) forKey:MPNowPlayingInfoPropertyPlaybackRate];
//音乐信息赋值给获取锁屏中心的nowPlayingInfo属性
playingInfoCenter.nowPlayingInfo = playingInfoDict;
}
#pragma mark - 开始播放音乐
- (void)playMusic
{
if (!self.player) {
return;
}
[self.player play];
[self updateLockScreenInfo];
}
#pragma mark - 暂停播放音乐
- (void)pauseMusic
{
if (!self.player) {
return;
}
[self.player pause];
[self updateLockScreenInfo];
}
#pragma mark - AVSpeechSynthesizerDelegate
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance
{
NSLog(@"开始tts播报");
}
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance
{
NSLog(@"结束tts播报");
[self starPlayMusic];
}
@end
遇到的问题
1、APP进入后台，音乐播放被暂停，长时间APP会被杀死
处理：通过监听APP进入前/后台，让音乐可以继续播放
#pragma mark - 监听APP进入前/后台(处理APP进入后台，音乐播放暂停问题)
- (void)registerAllNotifications
{
// 后台通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(apllicationWillResignActiveNotification:) name:UIApplicationWillResignActiveNotification object:nil];
// 进入前台通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(apllicationWillEnterForegroundNotification:) name:UIApplicationWillEnterForegroundNotification object:nil];
}
#pragma mark - 移除监听
- (void)removeAllNotifications {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillEnterForegroundNotification object:nil];
}
#pragma mark - 进入后台通知
- (void)apllicationWillResignActiveNotification:(NSNotification *)n
{
NSError *error = nil;
// 后台播放代码
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:&error];
if(error) {
NSLog(@"ListenPlayView background error0: %@", error.description);
}
//后台播放
[session setCategory:AVAudioSessionCategoryPlayback error:&error];
if(error) {
NSLog(@"ListenPlayView background error1: %@", error.description);
}
//开启后台处理多媒体事件
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}
#pragma mark - 进入前台通知
- (void)apllicationWillEnterForegroundNotification:(NSNotification *)n {
// 进前台 设置不接受锁屏页面控制
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}