iOS如何实现后台长时间运行
这篇文章主要介绍iOS如何实现后台长时间运行,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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APP申请后台运行的方式有几种:
播放音乐
定位
Newsstand downloads
fetch 等;

这里主要说下后台播放无声音乐(其实是不播放),采用哪种方式,对应勾选上图;我的项目中有音频播放需求,如果没有,那就找一个播放音频的理由,或者用其他方式实现。
实现
这里采用了两个单例:电话监控(XKTelManager)、后台运行(XKBGRunManager),电话监控可以忽略,视情况而用;采用单例是为了方便管理;
XKTelManager.h
#import@interface XKTelManager : NSObject ///是否在后台运行 @property (nonatomic,assign) BOOL inBackgroundRun; + (XKTelManager *)sharedManager; /** 来电监听 */ - (void)startMonitor; @end
XKTelManager.m
#import "XKTelManager.h" #import "XKBGRunManager.h" #import#import static XKTelManager *_sharedManger; @interface XKTelManager() @property (nonatomic, strong) CTCallCenter *callCenter; @end @implementation XKTelManager + (XKTelManager *)sharedManager{ static dispatch_once_t onceTelSingle; dispatch_once(&onceTelSingle, ^{ if (!_sharedManger) { _sharedManger = [[XKTelManager alloc]init]; } }); return _sharedManger; } - (instancetype)init{ self = [super init]; if (self) { _inBackgroundRun = NO; } return self; } #pragma mark -********* 监听电话相关 - (void)startMonitor { __weak typeof(self) weakSelf = self; _callCenter = [[CTCallCenter alloc] init]; _callCenter.callEventHandler = ^(CTCall * call) { ///如果已经进入后台了,不做任何操作 if (weakSelf.inBackgroundRun) { return; } ///APP未进入后台 if ([call.callState isEqualToString:CTCallStateDisconnected]){ NSLog(@"电话 --- 断开连接"); [[XKBGRunManager sharedManager] stopBGRun]; } else if ([call.callState isEqualToString:CTCallStateConnected]){ NSLog(@"电话 --- 接通"); } else if ([call.callState isEqualToString:CTCallStateIncoming]){ NSLog(@"电话 --- 待接通"); [[XKBGRunManager sharedManager] startBGRun]; } else if ([call.callState isEqualToString:CTCallStateDialing]){ NSLog(@"电话 --- 拨号中"); [[XKBGRunManager sharedManager] startBGRun]; } else { NSLog(@"电话 --- 无操作"); } }; } @end
XKBGRunManager.h
#import@interface XKBGRunManager : NSObject + (XKBGRunManager *)sharedManager; /** 开启后台运行 */ - (void)startBGRun; /** 关闭后台运行 */ - (void)stopBGRun; @end
XKBGRunManager.m
#import "XKBGRunManager.h"
///循环时间
static NSInteger _circulaDuration = 60;
static XKBGRunManager *_sharedManger;
@interface XKBGRunManager()
@property (nonatomic,assign) UIBackgroundTaskIdentifier task;
///后台播放
@property (nonatomic,strong) AVAudioPlayer *playerBack;
@property (nonatomic, strong) NSTimer *timerAD;
///用来打印测试
@property (nonatomic, strong) NSTimer *timerLog;
@property (nonatomic,assign) NSInteger count;
@end
@implementation XKBGRunManager{
CFRunLoopRef _runloopRef;
dispatch_queue_t _queue;
}
+ (XKBGRunManager *)sharedManager{
static dispatch_once_t onceRunSingle;
dispatch_once(&onceRunSingle, ^{
if (!_sharedManger) {
_sharedManger = [[XKBGRunManager alloc]init];
}
});
return _sharedManger;
}
/// 重写init方法,初始化音乐文件
- (instancetype)init {
if (self = [super init]) {
[self setupAudioSession];
_queue = dispatch_queue_create("com.audio.inBackground", NULL);
//静音文件
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"****" ofType:@"mp3"];
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
self.playerBack = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
[self.playerBack prepareToPlay];
// 0.0~1.0,默认为1.0
self.playerBack.volume = 0.01;
// 循环播放
self.playerBack.numberOfLoops = -1;
}
return self;
}
- (void)setupAudioSession {
// 新建AudioSession会话
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
// 设置后台播放
NSError *error = nil;
[audioSession setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:&error];
if (error) {
NSLog(@"Error setCategory AVAudioSession: %@", error);
}
NSLog(@"%d", audioSession.isOtherAudioPlaying);
NSError *activeSetError = nil;
// 启动AudioSession,如果一个前台app正在播放音频则可能会启动失败
[audioSession setActive:YES error:&activeSetError];
if (activeSetError) {
NSLog(@"Error activating AVAudioSession: %@", activeSetError);
}
}
/**
启动后台运行
*/
- (void)startBGRun{
[self.playerBack play];
[self applyforBackgroundTask];
///确保两个定时器同时进行
dispatch_async(_queue, ^{
self.timerLog = [[NSTimer alloc] initWithFireDate:[NSDate date] interval:1 target:self selector:@selector(log) userInfo:nil repeats:YES];
self.timerAD = [[NSTimer alloc] initWithFireDate:[NSDate date] interval:_circulaDuration target:self selector:@selector(startAudioPlay) userInfo:nil repeats:YES];
_runloopRef = CFRunLoopGetCurrent();
[[NSRunLoop currentRunLoop] addTimer:self.timerAD forMode:NSDefaultRunLoopMode];
[[NSRunLoop currentRunLoop] addTimer:self.timerLog forMode:NSDefaultRunLoopMode];
CFRunLoopRun();
});
}
/**
申请后台
*/
- (void)applyforBackgroundTask{
_task =[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
[[UIApplication sharedApplication] endBackgroundTask:_task];
_task = UIBackgroundTaskInvalid;
});
}];
}
/**
打印
*/
- (void)log{
_count = _count + 1;
NSLog(@"_count = %ld",_count)
}
/**
检测后台运行时间
*/
- (void)startAudioPlay{
_count = 0;
dispatch_async(dispatch_get_main_queue(), ^{
if ([[UIApplication sharedApplication] backgroundTimeRemaining] < 61.0) {
NSLog(@"后台快被杀死了");
[self.playerBack play];
[self applyforBackgroundTask];
}
else{
NSLog(@"后台继续活跃呢");
}///再次执行播放器停止,后台一直不会播放音乐文件
[self.playerBack stop];
});
}
/**
停止后台运行
*/
- (void)stopBGRun{
if (self.timerAD) {
CFRunLoopStop(_runloopRef);
[self.timerLog invalidate];
self.timerLog = nil;
// 关闭定时器即可
[self.timerAD invalidate];
self.timerAD = nil;
[self.playerBack stop];
}
if (_task) {
[[UIApplication sharedApplication] endBackgroundTask:_task];
_task = UIBackgroundTaskInvalid;
}
}
@end最后在 AppDelegate.m 对应的方法中,实现开启和停止后台运行即可!
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