项目中常用功能，如：流媒体、健康数据（步数等）等－b

整理iOS开发中使用的各种流媒体和常用的高级功能。由于时间关系，目前只写了一部分功能，全部都采用的是系统方法，没用第三方，截图如下：

screen1.png

screen2.png

个人比较懒，不爱多写文字，直接上代码，哈哈。

视频

系统用AVFoundation与MediaPlayer框架实现播放视频的方案。其中AVFoundation扩展性好，都需自定义功能，而MediaPlayer集成简单，但是样式不可扩展。

1.AVFoundation使用AVPlayer播放视频，它属于view的layer层。其功能都需要自定义，如音量、暂停、播放时长等。代码如下：

- (void)addAVPlayer{    
    self.playerItem = [AVPlayerItem playerItemWithURL:self.movieURL];    self.player = [AVPlayer playerWithPlayerItem:self.playerItem];    AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:self.player];    
    layer.frame = CGRectMake(0, 70, kScreenWidth, 300);    
    layer.videoGravity = AVLayerVideoGravityResizeAspect;    
    layer.backgroundColor = [[UIColor blackColor] CGColor];    
    [self.view.layer addSublayer:layer];    
    [self.player play];
}
#pragma mark - Observer//添加进度观察
- (void)addProgressObserver {    
    //  设置每秒执行一次    
    __weak LXAVPlayVideoController *wSelf = self;    
    [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue: NULL usingBlock:^(CMTime time) {        //        NSLog(@"进度观察 + %f", wSelf.topProgressSlider.value);         //  获取当前时间        
        CMTime currentTime = wSelf.player.currentItem.currentTime;        //  转化成秒数        
        CGFloat currentPlayTime = (CGFloat)currentTime.value/currentTime.timescale;        //  总时间        
        CMTime totalTime = wSelf.playerItem.duration;        //  转化成秒        
        wSelf.totalMovieDuration = (CGFloat)totalTime.value/totalTime.timescale;          
        wSelf.topProgressSlider.value = currentPlayTime/wSelf.totalMovieDuration;        
        wSelf.progressValue = CMTimeGetSeconds(currentTime)/wSelf.totalMovieDuration;        
        wSelf.topPastTimeLabel.text = [LXHelpClass getTimeByProgress:currentPlayTime];        
        wSelf.topRemainderLabel.text = [LXHelpClass getTimeByProgress:wSelf.totalMovieDuration - currentPlayTime];        //        NSLog(@"%f %f %f %f", wSelf.topProgressSlider.value, wSelf.totalMovieDuration, currentPlayTime, currentPlayTime/wSelf.totalMovieDuration);    
   }];
}
//播放结束后的代理回调

- (void)moviePlayDidEnd:(NSNotification *)notify {    
    [self setMovieParse];
}
#pragma mark - Enent response//播放进度
- (void)topSliderValueChangedAction:(UISlider *)sender {    
    NSLog(@"进度条进度 + %f", sender.value);    
    double currentTime = floor(self.totalMovieDuration * sender.value);    //转换成CMTime才能给player来控制播放进度    
    CMTime dragedCMTime = CMTimeMake(currentTime, 1);    
    [self.player seekToTime:dragedCMTime completionHandler:^(BOOL finished) {        
        [self.player play];    
    }];
}
//音量slider

- (void)bottomSoundSliderAction:(UISlider *)sender {    
    [self.player setVolume:sender.value];    
    self.bottomSoundSlider.value = sender.value;    
    if (sender.value == 0) {        
        NSLog(@"静音");    
    }
}
//播放暂停按钮
- (void)playBtnClicked:(UIButton *)sender {    
    if (isPlay) {        
        [self setMovieParse];    
    } else {        
        [self setMoviePlay];    
    }      
    isPlay ^= 1;
}
#pragma mark - Private methods

- (void)addNotificationCenters {    
    //  注册观察者用来观察，是否播放完毕    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayDidEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
}  
- (void)setMovieParse {    
    [self.player pause];
}  
- (void)setMoviePlay {    
    [self.player play];
}

2.MediaPlayer框架提供MPMoviePlayerController与MPMoviePlayerViewController播 放视频，它们区别就是MPMoviePlayerViewController里面包含了一个MPMoviePlayerController，另外 MPMoviePlayerViewController可以看作是一个控制器播放视频的。系统已经为之集成好了音量、播放暂停等功能。

• MPMoviePlayerController的使用

- (void)addMPMoviePlayer{    
    MPMoviePlayerController *mpPlayer = [[MPMoviePlayerController alloc] init];    
    mpPlayer.view.frame = CGRectMake(0, 20, kScreenWidth, kScreenWidth/videoSizeRate);    
    mpPlayer.backgroundView.backgroundColor = [UIColor blackColor];    
    mpPlayer.scalingMode = MPMovieScalingModeAspectFill;    
    [self.view addSubview:mpPlayer.view];    
    self.mpPlayer = mpPlayer;
}
#pragma mark - Observer

- (void)enterFullscreen:(NSNotification *)noti {    
    [self fullScreen:YES];    
    [LXHelpClass setDeviceLandscape:direction];
}
- (void)exitFullscreen:(NSNotification *)noti {    
    [self fullScreen:NO];    
    UIDeviceOrientation orient = [UIDevice currentDevice].orientation;    
    if (orient != UIDeviceOrientationPortrait) {        
        direction = UIDeviceOrientationPortrait;        
        [LXHelpClass setDeviceLandscape:direction];     }    
    direction = UIDeviceOrientationLandscapeLeft;
}
- (void)loadCompletion:(NSNotification *)noti {    
    [self.videoLoading stopAnimating];
}
- (void)orientChange:(NSNotification *)noti {    
    UIDeviceOrientation orient = [UIDevice currentDevice].orientation;    
    switch (orient)     {        
        case UIDeviceOrientationPortrait:            
            self.mpPlayer.fullscreen = NO;            
            break;        
        case UIDeviceOrientationLandscapeLeft:            
            direction = UIDeviceOrientationLandscapeLeft;            
            self.mpPlayer.fullscreen = YES;            
            break;        
        case UIDeviceOrientationPortraitUpsideDown:            
            self.mpPlayer.fullscreen = NO;            
            break;        
        case UIDeviceOrientationLandscapeRight:            
            direction = UIDeviceOrientationLandscapeRight;            
            self.mpPlayer.fullscreen = YES;            
            break;        
            default:  
            break;    
     }
}  - (void)mediaPlayerPlaybackStateChange:(NSNotification *)notification {    
    switch (self.mpPlayer.playbackState) {        
        case MPMoviePlaybackStatePlaying:            
            NSLog(@"正在播放...");            
            break;        
        case MPMoviePlaybackStatePaused:            
            NSLog(@"暂停播放.");//注意播放完成时的状态是暂停            
            break;        
        case MPMoviePlaybackStateStopped:            
            NSLog(@"停止播放.");            
            break;        
        default:            
            NSLog(@"播放状态:%li",self.mpPlayer.playbackState);            
            break;    
      }
}  
- (void)mediaPlayerThumbnailRequestFinished:(NSNotification *)notification {    
    NSLog(@"视频截图完成.");    
    UIImage *image=notification.userInfo[MPMoviePlayerThumbnailImageKey];    //保存图片到相册(首次调用会请求用户获得访问相册权限)    
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

• MPMoviePlayerViewController的使用

- (void)viewDidLoad {    
    [super viewDidLoad];    
    self.view.backgroundColor = bgColor;    
    MPMoviePlayerViewController *player = [[MPMoviePlayerViewController alloc] initWithContentURL:self.mp4URL];    
    player.view.frame = CGRectMake(0, 0, kScreenWidth, 300);    
    [self.view addSubview:player.view];    
    self.player = player;    
    UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    
    button.frame = CGRectMake((kScreenWidth-100)/2.0, kScreenHeight - 64 - 100, 100, 50);    
    [button setTitle:@"全屏播放" forState:UIControlStateNormal];    
    [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];    
    [self.view addSubview:button];
}  
- (void)buttonClick {    
    [self presentMoviePlayerViewControllerAnimated:self.player];
}

音频

系统也提供灵活性很强的AVAudioPlayer和集成快的MPMusicPlayerController播放音乐。
具体功能实现请查看源码，这里不做过多介绍。

健康

这方面的资料比较少，只好查看官方文档。这里我只写了获取步数这个常用功能。HealthKit框架提供了许多获取健康数据的API。

LXHealthKitManager *myHealth = [LXHealthKitManager sharedLXHealthKitManager];
myHealth.startDate = [LXHealthKitManager getTodayAgoWithDays:30];//获取今天之前三十天的步数[myHealth getStepCountWithSuccess:^(NSArray *results) {    
[self.modelArr setArray:results];    
dispatch_async(dispatch_get_main_queue(), ^{        
    [self.tableView reloadData];    
});
} withfailure:^(NSError *error) {    
    NSLog(@"error:%@", error);
}];

LXHealthKitManager的代码如下：

- (instancetype)init {    
    self = [super init];    
    if (self) {        
        [self setup];    
    }    
    return self;
}  
- (void)setup {    
    if ([HKHealthStore isHealthDataAvailable]) {        
        NSLog(@"此设备能使用健康数据");        
        HKHealthStore *healthStore = [[HKHealthStore alloc] init];        
        [healthStore requestAuthorizationToShareTypes:[self shareTypes] readTypes:[self readTypes] completion:^(BOOL success, NSError *error) {            
        if (success == YES)  {                
            NSLog(@"授权成功");            
        } else {                
            NSLog(@"授权失败");            
        }     }];        
    self.healthStore = healthStore;    
    } else {        
        NSLog(@"此设备不能使用健康数据");    
    }
}  
- (void)getStepCountWithSuccess:(void (^)(NSArray *))success withfailure:(void (^)(NSError *))failure {    
    HKQuantityType *quantityType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount];    NSPredicate *predicate = [HKQuery predicateForSamplesWithStartDate:self.startDate endDate:self.endDate options:HKQueryOptionStrictEndDate];    NSDateComponents *dateComponents = [[NSDateComponents alloc] init];    
    dateComponents.day = 1;      
    HKStatisticsCollectionQuery *collectionQuery = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:quantityType quantitySamplePredicate:predicate options:HKStatisticsOptionCumulativeSum | HKStatisticsOptionSeparateBySource anchorDate:self.startDate intervalComponents:dateComponents];      
    collectionQuery.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection * __nullable result, NSError * __nullable error) {        NSMutableArray *returnArr = [NSMutableArray array];        for (NSInteger i = result.statistics.count - 1; i >= 0; i--) {            
        HKStatistics *statistic = result.statistics[i];            for (HKSource *source in statistic.sources) {                if ([source.name isEqualToString:[UIDevice currentDevice].name]) {                    
            LXHealthStepModel *model = [[LXHealthStepModel alloc] init];                    
            model.startDateStr = [self changeToDateStrWithDate:statistic.startDate];                    
            model.endDateStr = [self changeToDateStrWithDate:statistic.endDate];                      
            HKQuantity *quantity = [statistic sumQuantityForSource:source];                    if ([quantity isCompatibleWithUnit:[HKUnit countUnit]]) {                        
            model.stepCount = (NSInteger)[quantity doubleValueForUnit:[HKUnit countUnit]];                     

            }                    
            [returnArr addObject:model];                
            }            
          }        
      }        
      if (!error) {            
            if (success) {                
                  success(returnArr);            
            }        
       } else if (failure) {            
               failure(error);        
       }    
    };    
    [self.healthStore executeQuery:collectionQuery];
}

源码请点击github地址:https://github.com/SoftProgramLX/LXBaseFunction

简书作者:App开发LX

地址:http://www.jianshu.com/p/c62886e0ac3c