調用系統(tǒng)封裝好的播放界面

//視頻播放的url
    NSURL *playerURL = [NSURL fileURLWithPath:self.datasource[indexPath.row]];
    //初始化
    self.playerView = [[AVPlayerViewController alloc]init];
    //AVPlayerItem 視頻的一些信息  創(chuàng)建AVPlayer使用的
    AVPlayerItem *item = [[AVPlayerItem alloc]initWithURL:playerURL];
    //通過AVPlayerItem創(chuàng)建AVPlayer
    self.player = [[AVPlayer alloc]initWithPlayerItem:item];
    //設置AVPlayerViewController內部的AVPlayer為剛創(chuàng)建的AVPlayer
    self.playerView.player = self.player;
    //關閉AVPlayerViewController內部的約束
    self.playerView.view.translatesAutoresizingMaskIntoConstraints = YES;
    [self presentViewController:self.playerView animated:YES completion:nil];

播放一段文本

將文本當做聲音播放（默認播放英文）
AVSpeechSynthesizer *syn = [[AVSpeechSynthesizeralloc]init];
AVSpeechUtterance *utterance = [[AVSpeechUtterancealloc]initWithString:@“hello world"];
[syn speakUtterance:utterance];

AVAduioSession 應用程序與音頻會話交互的接口

session = [AVAudioSession sharedInstance]//獲取session單利
[session setCateGory:AVAudioSessionCategoryPlayback error:&error];//     設置會話模式
[session setActive:YES error:&error];//激活設置的模式
AVAudioPlayer 音頻播放器屬性
self.audioPlayer.numberOfLoops = -1;//循環(huán)
self.audioPlayer.volume = self.volumeValue;//音量
self.audioPlayer.pan = self.panValue;//左右聲道
self.audioPlayer.enableRate = YES;
self.audioPlayer.rate = 1;//播放速率
音頻會話的中斷通知
//添加中斷通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];

權限判斷

• 相機權限判斷

#import <AVFoundation/AVCaptureDevice.h>
#import <AVFoundation/AVMediaFormat.h>
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied)
{
    //無權限
}

• 相冊權限判斷

#import <AssetsLibrary/AssetsLibrary.h>
ALAuthorizationStatus author = [ALAssetsLibraryauthorization Status];
    if (author == kCLAuthorizationStatusRestricted || author ==kCLAuthorizationStatusDenied){
        //無權限
    }
    typedef enum {
        kCLAuthorizationStatusNotDetermined = 0, // 用戶尚未做出選擇這個應用程序的問候
        kCLAuthorizationStatusRestricted,        // 此應用程序沒有被授權訪問的照片數據。可能是家長控制權限
        kCLAuthorizationStatusDenied,            // 用戶已經明確否認了這一照片數據的應用程序訪問
        kCLAuthorizationStatusAuthorized         // 用戶已經授權應用訪問照片數據} CLAuthorizationStatus;
    }

• 打開應用程序權限設置
  [[UIApplication sharedApplication]openURL:[NSURLURLWithString:UIApplicationOpenSettingsURLString]];

開關手電筒

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if ([device hasTorch]) {
        [device lockForConfiguration:nil];
        if (open) {
            [device setTorchMode:AVCaptureTorchModeOn];
        } else {
            [device setTorchMode:AVCaptureTorchModeOff];
        }
        [device unlockForConfiguration];
    }