iOS有两种后台运行保活方式，第一种叫无声音乐保活（即在后台开启音频播放，只不过不需要播放出音量且不能影响其他音乐播发软件），第二种叫Background Task，但是这种方法在iOS 13以后只能申请短短的30秒钟时间，但是在iOS7-iOS13以前是可以申请到3分钟的保活时间的，当然我们也可以经过处理来申请到更多的保活时间。
无声音乐保活
1.打开应用的Target页面Signing & Cabailities，添加Capability（Background Modes）勾选Audio，AirPlay，and Picture in Picture选项
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2.在info.plist文件的【Required background modes】中，添加对应的key：【App plays audio or streams audio/video using AirPlay】
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3.在AppDelegate.m中添加监听
UIApplicationWillEnterForegroundNotification（应用进入前台通知）UIApplicationDidEnterBackgroundNotification（应用进入后台通知）
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
4.编写音乐播放类
.h文件
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
@interface BackgroundPlayer : NSObject <AVAudioPlayerDelegate>
{
AVAudioPlayer* _player;
}
- (void)startPlayer;
- (void)stopPlayer;
@end
.m文件
#import "BackgroundPlayer.h"
@implementation BackgroundPlayer
- (void)startPlayer
{
if (_player && [_player isPlaying]) {
return;
}
AVAudioSession *session = [AVAudioSession sharedInstance];
[[AVAudioSession sharedInstance] setMode:AVAudioSessionModeDefault error:nil];
NSString* route = [[[[[AVAudioSession sharedInstance] currentRoute] outputs] objectAtIndex:0] portType];
if ([route isEqualToString:AVAudioSessionPortHeadphones] || [route isEqualToString:AVAudioSessionPortBluetoothA2DP] || [route isEqualToString:AVAudioSessionPortBluetoothLE] || [route isEqualToString:AVAudioSessionPortBluetoothHFP]) {
if (@available(iOS 10.0, *)) {
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord
withOptions:(AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionAllowBluetooth | AVAudioSessionCategoryOptionAllowBluetoothA2DP)
error:nil];
} else {
// Fallback on earlier versions
}
}else{
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord
withOptions:(AVAudioSessionCategoryOptionMixWithOthers | AVAudioSessionCategoryOptionDefaultToSpeaker)
error:nil];
}
[session setActive:YES error:nil];
NSString *path = [[NSBundle mainBundle] pathForResource:@"music" ofType:@"wav"];
NSURL *url = [NSURL fileURLWithPath:path isDirectory:NO];
_player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[_player prepareToPlay];
[_player setDelegate:self];
_player.numberOfLoops = -1;
BOOL ret = [_player play];
if (!ret) {
NSLog(@"play failed,please turn on audio background mode");
}
}
- (void)stopPlayer
{
if (_player) {
[_player stop];
_player = nil;
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:NO error:nil];
NSLog(@"stop in play background success");
}
}
@end
将使用到的音乐文件放入项目：
WechatIMG17.jpeg
5.在应用进入后台时开启保活
在AppDelegate.m文件中，编写如下代码：
// 语音播报
#import <MediaPlayer/MediaPlayer.h>
#import <AVFoundation/AVFoundation.h>
@property (nonatomic, strong) BackgroundPlayer* player;
- (void)appWillEnterForeground {
if (self.player) {
[self.player stopPlayBackgroundAlive];
}
}
- (void)appDidEnterBackground {
if (_player == nil) {
_player = [[BackgroundPlayer alloc] init];
}
[self.player startPlayer];
}
Background Task保活
1.在info.plist文件的【Required background modes】中，添加对应的key：【App registers for location updates】
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2.同样我们需要监听
UIApplicationWillEnterForegroundNotification（应用进入前台通知）和UIApplicationDidEnterBackgroundNotification（应用进入后台通知）
在AppDelegate.m文件中编写如下代码：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillEnterForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
- (void)appWillEnterForeground {}
- (void)appDidEnterBackground {}
3.使用Background Task申请保活时间，在应用进入后台时开启保活，在应用进入前台时关闭保活：
在AppDelegate.m文件中编写如下代码：
@property (assign, nonatomic) UIBackgroundTaskIdentifier backgroundId;
- (void)appWillEnterForeground {
[self stopKeepAlive];
}
- (void)appDidEnterBackground {
_backgroundId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
//申请的时间即将到时回调该方法
NSLog(@"BackgroundTask time gone");
[self stopKeepAlive];
}];
}
- (void)stopKeepAlive{
if (_backgroundId) {
[[UIApplication sharedApplication] endBackgroundTask:_backgroundId];
_backgroundId = UIBackgroundTaskInvalid;
}
}
4.使用NSTimer循环申请保活时间，但是建议不要无限申请保活时间，因为系统如果发现该应用一直在后台运行时，是可能会直接crash掉你的应用的 ，错误码0x8badf00d.
将需要在后台一直运行的代码，写在AppDelegate.m中运行：
例如：像后台发送手机定位：
// 高德地图
#import <AMapFoundationKit/AMapFoundationKit.h>
#import <AMapLocationKit/AMapLocationKit.h>
//定位
@property (nonatomic,strong) AMapLocationManager *locationManager;
//注册定位信息
@property (nonatomic,strong) NSMutableDictionary * locationDic;
// 定位
self.locationDic = [@{} mutableCopy];
[self locationPresent];
//开启定时器（后台每五分钟上传一次定位）
[self StartTimer];
// 开启倒计时效果
- (void)StartTimer{
__block NSInteger time = 10; //倒计时时间
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
dispatch_source_set_timer(timer,DISPATCH_TIME_NOW,1.0*NSEC_PER_SEC, 0);//每秒执行
dispatch_source_set_event_handler(timer, ^{
if(time <= 0){ //倒计时结束，关闭
dispatch_source_cancel(timer);
dispatch_async(dispatch_get_main_queue(), ^{
[self StartTimer];
//上传定位信息
[self locationPresent];
});
}else{
dispatch_async(dispatch_get_main_queue(), ^{
});
time--;
}
});
dispatch_resume(timer);
}
//定位
-(void)locationPresent{
self.locationManager = [[AMapLocationManager alloc] init];
[self.locationManager setDelegate:self];
@try {
self.locationManager.allowsBackgroundLocationUpdates = YES;
} @catch (NSException *exception) {
NSLog(@"异常：%@", exception);
} @finally {
}
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = kCLDistanceFilterNone;
// 带逆地理信息的一次定位（返回坐标和地址信息）
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyHundredMeters];
// 设置不允许系统暂停定位
[self.locationManager setPausesLocationUpdatesAutomatically:NO];
// 定位超时时间，最低5s，此处设置为5s
self.locationManager.locationTimeout = 5;
// 逆地理请求超时时间，最低5s，此处设置为5s
self.locationManager.reGeocodeTimeout = 5;
[self.locationManager requestLocationWithReGeocode:YES completionBlock:^(CLLocation *location, AMapLocationReGeocode *regeocode, NSError *error){
if (error){
LLLog(@"%@",error);
NSLog(@"locError:{%ld - %@};", (long)error.code, error.localizedDescription);
if (error.code == AMapLocationErrorLocateFailed){
return;
}
}
NSLog(@"location:%@", location);
if (location) {
[self.locationDic setValue:@(location.coordinate.latitude) forKey:@"latitude"];
[self.locationDic setValue:@(location.coordinate.longitude) forKey:@"longitude"];
// 上传定位信息
[self UpdateLocationPlace];
}
}];
}
//上传当前位置
-(void)UpdateLocationPlace{
NSString *Url = [NSString stringWithFormat:@"%@%@",BaseUrl,UploadForDriver];
LLLog(@"UpdateLocationPlace===%@===%@",Url,self.locationDic);
[SendHttpRequest PostNSMutableDictionary:self.locationDic withNsstring:Url result:^(NSDictionary *result, NSError *error) {
LLLog(@"%@",result);
}];
}
转载自：https。//blog.csdn.net/qq_38520096/article/details/102626210
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