ios实现长时间后台运行

对于ios7，苹果支持几种后台运行模式，backgroundTask，voip，后台播放音乐等，具体看官方文档就好。
本文介绍依靠音乐播放来实现
#import 
#import 

@interface AllRuning : NSObject

@property (nonatomic, strong) AVAudioPlayer *myBackMusic;

+ (instancetype)sharedInstance;
- (void)creatVideo;
- (void)play;
- (void)pause;

@end

      

#import "AllRuning.h"

@implementation AllRuning
@synthesize myBackMusic;
// 声明一个静态变量
static AllRuning *sharedInstance = nil;

+ (instancetype)sharedInstance
{
    static dispatch_once_t predicate;
    dispatch_once(&predicate, ^{
        sharedInstance = [[self alloc] init];
        
    });
    return sharedInstance;
}

- (void)creatVideo
{
    NSString *musicPath = [[NSBundle mainBundle] pathForResource:@"Imagine" ofType:@"mp3"];
    NSURL *url = [[NSURL alloc] initFileURLWithPath:musicPath];
    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    // 创建播放器
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    self.myBackMusic = player; //赋值给自己定义的类变量
    [myBackMusic setVolume:0];
    myBackMusic.numberOfLoops = -1; //设置音乐播放次数  -1为一直循环
}

- (void)play
{
    [myBackMusic prepareToPlay];
    [myBackMusic play]; //播放
}

- (void)pause
{
    if (myBackMusic.isPlaying) {
        [myBackMusic pause];  //停止
    }
}

@end