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iOS后台保活 - 宋明的博客
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<h1 class="title">
iOS后台保活
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<a href="http://apolla.cc">宋明</a>
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<span class="date"><i class="fa fa-calendar-check-o" aria-hidden="true"></i> 2023/03/18</span>
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<span class="posted-in"><a href='%E7%A2%8E%E7%89%87%E8%8A%9D%E5%A3%AB%E6%94%B6%E8%97%8F.html'><i class="fa fa-folder" aria-hidden="true"></i> 碎片芝士收藏</a></span>
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<p>项目内嵌了H5导出的包 但是APP进入后台会导致未加载页面无法响应，故此想到后台保活策略 参考网上教程<a href="https://blog.csdn.net/WangQingLei0307/article/details/112002904">https://blog.csdn.net/WangQingLei0307/article/details/112002904</a><br />
<img src="media/16791162887780/16791164370243.png" alt="image.png" /></p>
<p>首先我们就要在Background Modes把音乐对应权限打开。</p>
<p>这个权限打开后，我们的工作就已经完成了1/3了</p>
<p>接下来我就就要在app进入后台的时候开始播放无声音的mp3。</p>
<p>我这里对音乐播放器进行了简单的封装，方便使用 SXAudioSessionObject</p>
<p>.h</p>
<pre class="line-numbers"><code class="language-objectivec">#import <Foundation/Foundation.h>
NS_ASSUME_NONNULL_BEGIN
@interface SXAudioSessionObject : NSObject
/// 创建单利
+ (SXAudioSessionObject *)shareManager;
/// 创建音乐播放器
- (void)creatAVAudioSessionObject;
/// 开始播放音乐
- (void)startPlayAudioSession;
/// 停止播放音乐
- (void)stopPlayAudioSession;
@end
NS_ASSUME_NONNULL_END
</code></pre>
<p>.m</p>
<pre class="line-numbers"><code class="language-objectivec">#import "SXAudioSessionObject.h"
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>
@interface SXAudioSessionObject()
@property (strong, nonatomic) AVAudioPlayer *audioPlayer;
@end
@implementation SXAudioSessionObject
/// 创建单利
+ (SXAudioSessionObject *)shareManager{
static SXAudioSessionObject *manager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
manager = [[SXAudioSessionObject alloc]init];
});
return manager;
}
/// 创建音乐播放器
- (void)creatAVAudioSessionObject{
//设置后台模式和锁屏模式下依然能够播放
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
//初始化音频播放器
NSError *playerError;
NSURL *urlSound = [[NSURL alloc]initWithString:[[NSBundle mainBundle]pathForResource:@"pomodoSound" ofType:@"m4a"]];
_audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:urlSound error:&playerError];
_audioPlayer.numberOfLoops = -1;//无限播放
_audioPlayer.volume = 0;
}
/// 开始播放声音
- (void)startPlayAudioSession{
[_audioPlayer play];
}
/// 停止播放声音
- (void)stopPlayAudioSession{
[_audioPlayer stop];
}
@end
</code></pre>
<blockquote>
<p>这里的音频需要放在本地 自己录一个1s无声音频就好了</p>
</blockquote>
<p>对这个封装完，我们就要使用了。后台保活，我们只需要在进入后台的时候播放音乐即可，进入前台我们停止音乐播放</p>
<p>首先我们先要穿件音乐播放器</p>
<pre class="line-numbers"><code class="language-objectivec">[[SXAudioSessionObject shareManager] creatAVAudioSessionObject];
</code></pre>
<p>接下来就是播放和停止</p>
<p>//应用程序已经进入后台运行</p>
<pre class="line-numbers"><code class="language-objectivec">- (void)applicationDidEnterBackground:(UIApplication *)application
{
NSLog(@"如果应用程序支持后台运行，则应用程序已经进入后台运行"); //如果需要退出后台,则在这里加上:exit(0);
[[SXAudioSessionObject shareManager] startPlayAudioSession]; //创建一个背景任务去和系统请求后台运行的时间
}
//应用程序已经进入活动状态
- (void)applicationDidBecomeActive:(UIApplication *)application{
NSLog(@"应用程序已进入前台，处于活动状态");
[[SXAudioSessionObject shareManager] stopPlayAudioSession];
}
</code></pre>
<p>同时我们还要创建一下UIBackgroundTaskIdentifier和NSTimer</p>
<pre class="line-numbers"><code class="language-objectivec">@property (nonatomic, assign) UIBackgroundTaskIdentifier backgrounTask;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.timer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(applyToSystemForMoreTime) userInfo:nil repeats:YES];
[self.timer setFireDate:[NSDate distantPast]];
return YES;
}
#pragma mark - 定时器设置判断后台保活时间，如果将要被后台杀死，重新唤醒
- (void)applyToSystemForMoreTime {
if ([UIApplication sharedApplication].backgroundTimeRemaining < 30.0) {//如果剩余时间小于30秒
[[UIApplication sharedApplication] endBackgroundTask:self.self.backgrounTask];
self.backgrounTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.self.backgrounTask];
self.backgrounTask = UIBackgroundTaskInvalid;
}];
}
}
</code></pre>
<p>上面的代码最好写成，如果进入后台的时候再启用定时器，在前台定时器处于停止状态即可。</p>
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