iOS後台運行播放無聲音頻 測試可行

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如果打回來了，就自認倒黴吧

製作無聲音頻。

 

 

 

@interface AppDelegate ()

{

NSInteger count;

}

 

@property(strong, nonatomic)NSTimer *mTimer;

@property(assign, nonatomic)UIBackgroundTaskIdentifier backIden;

 

- (void)applicationDidEnterBackground:(UIApplication *)application {

 

_mTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(countAction) userInfo:nil repeats:YES];

[[NSRunLoop currentRunLoop] addTimer:_mTimer forMode:NSRunLoopCommonModes];

[self beginTask];

 

}

//計時

-(void)countAction{

NSLog(@"%li",count++);

}

//申請後台

-(void)beginTask

{

NSLog(@"begin=============");

_backIden = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{

 

NSLog(@"將要掛起=============");

[self endBack];

}];

}

//登出後台

-(void)endBack

{

NSLog(@"end=============");

[[UIApplication sharedApplication] endBackgroundTask:_backIden];

_backIden = UIBackgroundTaskInvalid;

}

- (void)applicationWillEnterForeground:(UIApplication *)application {

 

[self endBack];

 

}

 

 

 

#import <AVFoundation/AVFoundation.h>

 

 

 

@property(strong, nonatomic)AVAudioPlayer *mPlayer;

 

@property(assign, nonatomic)CGFloat mCount;

 

- (void)viewDidLoad {

[super viewDidLoad];

 

 

_mCount = 0;

 

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(countTime) userInfo:nil repeats:YES];

[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

 

 

}

 

-(void)countTime{

_mCount+=10;

NSLog(@"%f",_mCount);

 

if ([[UIApplication sharedApplication] backgroundTimeRemaining] < 60.) {//當剩餘時間小於60時，開如播放音樂，並用這個假前台狀態再次申請後台

NSLog(@"播放%@",[NSThread currentThread]);

[self playMusic];

//申請後台

[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{

NSLog(@"我要掛起了");

}];

}

}

 

-(void)playMusic{

//1.音頻檔案的url路徑，實際開發中，用無聲音樂

NSURL *url=[[NSBundle mainBundle]URLForResource:@"wusheng.mp3" withExtension:Nil];

 

//2.建立播放器（注意：一個AVAudioPlayer只能播放一個url）

_mPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:url error:Nil];

 

//3.緩衝

[_mPlayer prepareToPlay];

_mPlayer.numberOfLoops = -1;

//4.播放

[_mPlayer play];

}

iOS後台運行播放無聲音頻 測試可行