小编给大家分享一下iOS如何实现锁屏页面控制音乐播放，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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本文实例为大家分享了iOS锁屏页面控制音乐播放的具体代码，供大家参考，具体内容如下
//1、调整音频会话设置，确保应用进入后台或静音开关已开启时音频仍将继续播放
//2、锁屏状态下显示媒体信息
//3、锁屏上的空间可以控制音频播放
#import "ViewController.h"
#import
#import
@interface ViewController ()
@property (nonatomic, strong) AVAudioPlayer *audioPlayer;
@property (weak, nonatomic) UIButton *playButton;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton * playButton = [UIButton buttonWithType:UIButtonTypeSystem];
playButton.frame = CGRectMake(0, 0, 200, 40);
playButton.center = self.view.center;
[playButton setTitle:@"在后台播放音频" forState:UIControlStateNormal];
[playButton addTarget:self action:@selector(playMusicInBackground:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:playButton];
NSError *playerInitError = nil;
NSString *audioPath =
[[NSBundle mainBundle] pathForResource:@"background_audio"
ofType:@"mp3"];
NSURL *audioURL = [NSURL fileURLWithPath:audioPath];
self.audioPlayer = [[AVAudioPlayer alloc]
initWithContentsOfURL:audioURL
error:&playerInitError];
AVAudioSession *session = [AVAudioSession sharedInstance];
NSError *activeError = nil;
if (![session setActive:YES error:&activeError]) {
NSLog(@"Failed to set active audio session!");
}
//No.1
//开始写代码，调整音频会话设置，确保即便应用进入后台或静音开关已开启，音频仍将继续播放
NSError *categoryError = nil;
[session setCategory:AVAudioSessionCategoryPlayback error:&categoryError];
//end_code
}
- (void)playMusicInBackground:(id)sender {
if ([self.audioPlayer isPlaying]) {
[self.audioPlayer stop];
[self.playButton setTitle:@"正在播放音乐"
forState:UIControlStateNormal];
} else {
UIImage *lockImage = [UIImage imageNamed:@"belongToMe.jpg"];
MPMediaItemArtwork *artwork =
[[MPMediaItemArtwork alloc] initWithImage:lockImage];
NSDictionary *mediaDict =
@{
MPMediaItemPropertyTitle: @"BackgroundTask Audio",
MPMediaItemPropertyMediaType: @(MPMediaTypeAnyAudio),
MPMediaItemPropertyPlaybackDuration:
@(self.audioPlayer.duration),
MPNowPlayingInfoPropertyPlaybackRate: @1.0,
MPNowPlayingInfoPropertyElapsedPlaybackTime:
@(self.audioPlayer.currentTime),
MPMediaItemPropertyAlbumArtist: @"Some User",
MPMediaItemPropertyArtist: @"Some User",
MPMediaItemPropertyArtwork: artwork };
[self.audioPlayer play];
[self.playButton setTitle:@"停止播放后台音乐"
forState:UIControlStateNormal];
//No.2
//开始写代码，将媒体信息显示在锁定屏幕上，并使锁屏上控件可以控制音频播放
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
//end_code
}
}
//No.3
//开始写代码，响应远程控制，使得进入锁屏状态后可以控制音乐“播放”和“暂停”
- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlPlay:
[self.audioPlayer play];
break;
case UIEventSubtypeRemoteControlPause:
[self.audioPlayer pause];
break;
default:
NSLog(@"没有处理过这个事件------receivedEvent.subtype==%ld",(long)receivedEvent.subtype);
break;
}
}
}
//end_code
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
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