調(diào)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(guò)AVPlayerItem創(chuàng)建AVPlayer
    self.player = [[AVPlayer alloc]initWithPlayerItem:item];
    //設(shè)置AVPlayerViewController內(nèi)部的AVPlayer為剛創(chuàng)建的AVPlayer
    self.playerView.player = self.player;
    //關(guān)閉AVPlayerViewController內(nèi)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(dāng)做聲音播放（默認(rèn)播放英文）
AVSpeechSynthesizer *syn = [[AVSpeechSynthesizeralloc]init];
AVSpeechUtterance *utterance = [[AVSpeechUtterancealloc]initWithString:@“hello world"];
[syn speakUtterance:utterance];

AVAduioSession 應(yīng)用程序與音頻會(huì)話交互的接口

session = [AVAudioSession sharedInstance]//獲取session單利
[session setCateGory:AVAudioSessionCategoryPlayback error:&error];//     設(shè)置會(huì)話模式
[session setActive:YES error:&error];//激活設(shè)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(huì)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(quán)限判斷

• 相機(jī)權(quán)限判斷

#import <AVFoundation/AVCaptureDevice.h>
#import <AVFoundation/AVMediaFormat.h>
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied)
{
    //無(wú)權(quán)限
}

• 相冊(cè)權(quán)限判斷

#import <AssetsLibrary/AssetsLibrary.h>
ALAuthorizationStatus author = [ALAssetsLibraryauthorization Status];
    if (author == kCLAuthorizationStatusRestricted || author ==kCLAuthorizationStatusDenied){
        //無(wú)權(quán)限
    }
    typedef enum {
        kCLAuthorizationStatusNotDetermined = 0, // 用戶(hù)尚未做出選擇這個(gè)應(yīng)用程序的問(wèn)候
        kCLAuthorizationStatusRestricted,        // 此應(yīng)用程序沒(méi)有被授權(quán)訪問(wèn)的照片數(shù)據(jù)畴蒲∮瓢埃可能是家長(zhǎng)控制權(quán)限
        kCLAuthorizationStatusDenied,            // 用戶(hù)已經(jīng)明確否認(rèn)了這一照片數(shù)據(jù)的應(yīng)用程序訪問(wèn)
        kCLAuthorizationStatusAuthorized         // 用戶(hù)已經(jīng)授權(quán)應(yīng)用訪問(wèn)照片數(shù)據(jù)} CLAuthorizationStatus;
    }

• 打開(kāi)應(yīng)用程序權(quán)限設(shè)置
  [[UIApplication sharedApplication]openURL:[NSURLURLWithString:UIApplicationOpenSettingsURLString]];

開(kāi)關(guān)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];
    }