//
// ViewController.m
// TheBackground
//
// Created by 王木木 on 2018/4/27.
// Copyright © 2018年 wangmumu. All rights reserved.
//
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
/** */
@property (nonatomic,strong) AVAudioPlayer *audioPlayer;
@property (nonatomic, assign) UIBackgroundTaskIdentifier bgTask;
/** */
@property (nonatomic,strong) NSTimer *timer;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
#ifdef HAN
NSLog(@"1111");
#endif
NSError *error;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
if (error) {
NSLog(@"有错误1");
}
NSError *activeError;
[[AVAudioSession sharedInstance] setActive:YES error:&activeError];
if (activeError) {
NSLog(@"有错误2");
}
NSError *audioError;
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[self getUrl] error:&audioError];
[self.audioPlayer prepareToPlay];
[self.audioPlayer setNumberOfLoops:-1];
self.audioPlayer.volume = 1.0;
if (audioError) {
NSLog(@"播放器初始化失败");
self.audioPlayer = nil;
}
[self creatPlayer];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(breakAudioSessionEvent:) name:AVAudioSessionInterruptionNotification object:nil];
self.bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.bgTask];
self.bgTask = UIBackgroundTaskInvalid;
}];
//开启定时器 不断向系统请求后台任务执行的时间
self.timer = [NSTimer scheduledTimerWithTimeInterval:25.0 target:self selector:@selector(applyForMoreTime) userInfo:nil repeats:YES];
[self.timer fire];
}
- (void)applyForMoreTime {
//如果系统给的剩余时间小于60秒 就终止当前的后台任务，再重新初始化一个后台任务，重新让系统分配时间，这样一直循环下去，保持APP在后台一直处于active状态。
if ([UIApplication sharedApplication].backgroundTimeRemaining < 60) {
[[UIApplication sharedApplication] endBackgroundTask:self.bgTask];
self.bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.bgTask];
self.bgTask = UIBackgroundTaskInvalid;
}];
}
}
- (void)breakAudioSessionEvent:(NSNotificationCenter *)sender {
NSLog(@"来电话了");
[self creatPlayer];
}
- (void)creatPlayer {
[self.audioPlayer play];
}
- (NSURL *)getUrl {
NSString *path = [[NSBundle mainBundle] pathForResource:@"群星-昨日重现" ofType:@"mp3"];
NSURL *pathUrl = [NSURL fileURLWithPath:path];
return pathUrl;
}
@end
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