需求
1、当应用一直保持在前台的情况下，收到推送消息后语音和振动可以正常触发
2、在第一条的基础上，语音和振动被触发后再按Home键进入后台，这时语音和振动都失效
3、当应用进入后台的情况下，收到推送消息后语音和振动都不能被触发
方案
方案1.开启后台持续定位
<1>设置Backgound Modes
<2>在info.plist中设置
Privacy - Location Always Usage Description
<3>在didFinishLaunchingWithOptions中执行下面的initLocationManager方法
-(void)initLocationManager{
//1.创建定位管理对象
_manager = [[CLLocationManager alloc]init];
//2.设置属性 distanceFilter、desiredAccuracy
_manager.distanceFilter = kCLDistanceFilterNone;//实时更新定位位置
_manager.desiredAccuracy = kCLLocationAccuracyBest;//定位精确度
if([_manager respondsToSelector:@selector(requestAlwaysAuthorization)]){
[_manager requestAlwaysAuthorization];
}
//该模式是抵抗程序在后台被杀，申明不能够被暂停
_manager.pausesLocationUpdatesAutomatically = NO;
_manager.allowsBackgroundLocationUpdates = YES;
//3.设置代理
_manager.delegate = self;
//4.开始定位
[_manager startUpdatingLocation];
//5.获取朝向
[_manager startUpdatingHeading];
}
//定位成功调用的的方法
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
// 获取位置信息
CLLocation *newLocation=[locations lastObject];
double lat = newLocation.coordinate.latitude;
double lon = newLocation.coordinate.longitude;
double alt = newLocation.altitude;
NSLog(@"纬度:%f,经度:%f,海拔:%f",lat,lon,alt);
}
- (void)applicationWillResignActive:(UIApplication *)application {
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self.manager startUpdatingLocation];
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
NSLog(@"进入后台");
UIApplication *app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier bgTask;
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid){
bgTask = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid){
bgTask = UIBackgroundTaskInvalid;
}
});
});
[self.manager startUpdatingLocation];
}
方案2.后台连续播放音乐的方法
<1>设置Backgound Modes
<2>在didFinishLaunchingWithOptions中执行下面的initPlayMusic方法
-(void)initPlayMusic{
//先注册响应后台控制
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
//处理中断事件的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleInterreption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];
//设置并激活音频会话类别
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
[session setActive:YES error:nil];
//播放背景音乐
NSString *musicPath = [[NSBundle mainBundle] pathForResource:@"紫藤花" ofType:@"mp3"];
NSURL *url = [[NSURL alloc] initFileURLWithPath:musicPath];
// 创建播放器
_player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[_player prepareToPlay];
_player.volume = 1;
_player.numberOfLoops = -1; //设置音乐播放次数 -1为一直循环
[_player play]; //播放
}
//处理中断事件
-(void)handleInterreption:(NSNotification *)sender{
NSLog(@"--1->%@",sender.userInfo);
if(_isPlayed){
[self.player pause];
_isPlayed = NO;
}else{
[self.player play];
_isPlayed = YES;
}
}
//应用将要进入不活跃的状态
-(void)applicationWillResignActive:(UIApplication *)application{
//开启后台处理多媒体事件
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
AVAudioSession *session=[AVAudioSession sharedInstance];
[session setActive:YES error:nil];
//后台播放//这样做，可以在按home键进入后台后 ，播放一段时间，几分钟吧。但是不能持续播放网络歌曲，
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
//若需要持续播放网络歌曲，还需要申请后台任务id，具体做法是：
//其中的_bgTaskId是后台任务UIBackgroundTaskIdentifier _bgTaskId;
_bgTaskId =[AppDelegate backgroundPlayerID:_bgTaskId];
}
//实现一下backgroundPlayerID:这个方法:
+(UIBackgroundTaskIdentifier)backgroundPlayerID:(UIBackgroundTaskIdentifier)backTaskId{
//允许应用程序接收远程控制
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
//设置后台任务ID
UIBackgroundTaskIdentifier newTaskId = UIBackgroundTaskInvalid;
newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
if(newTaskId!=UIBackgroundTaskInvalid&&backTaskId!=UIBackgroundTaskInvalid){
[[UIApplication sharedApplication] endBackgroundTask:backTaskId];
}
return newTaskId;
}
结语
以上两种方法经测试，可以一直在后台运行不会被kill掉
