iOS学习之路09

• UIImagePickerController
  • 属性imagePicker指的是UIImagePickerController所属类型
  • 图片库

    /*

    UIImagePickerControllerSourceTypePhotoLibrary, 图片库

    UIImagePickerControllerSourceTypeCamera, 相机

    UIImagePickerControllerSourceTypeSavedPhotosAlbum 照片

    */

    self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    //模态弹出imagePicker

    [self presentViewController:self.imagePicker animated:YES completion:nil];

  • 摄影

    self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

     

    // 设置媒体模式为movie(电影)

    self.imagePicker.mediaTypes = @[(NSString *)kUTTypeMovie];

     

    /* 相机模式为 video(摄影)

    UIImagePickerControllerCameraCaptureModePhoto 照相

    UIImagePickerControllerCameraCaptureModeVideo 视频

    */

    self.imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;

     

    /* 设置视频的质量

    UIImagePickerControllerQualityTypeHigh = 0, 高质量

    UIImagePickerControllerQualityTypeMedium = 1,

    UIImagePickerControllerQualityTypeLow = 2, 低质量

    UIImagePickerControllerQualityType640x480 640*480

    UIImagePickerControllerQualityTypeIFrame1280x720 1280*720

    UIImagePickerControllerQualityTypeIFrame960x540 960*540

    */

    self.imagePicker.videoQuality = UIImagePickerControllerQualityType640x480;

     

    [self presentViewController:self.imagePicker animated:YES completion:nil];

  • 照相

    self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

     

    /* 媒体模式

    kUTTypeImage、kUTTypeJPEG、kUTTypeJPEG2000、kUTTypeTIFF、kUTTypePICT、kUTTypeGIF、kUTTypePNG、kUTTypeQuickTimeImage、kUTTypeAppleICNS、kUTTypeBMP、

    kUTTypeICO、kUTTypeRawImage、kUTTypeScalableVectorGraphics、kUTTypeLivePhoto

    */

    self.imagePicker.mediaTypes = @[(NSString *)kUTTypeImage];

     

    // 是否可以编辑，只有一个图片选择小框

    self.imagePicker.allowsEditing = YES;

     

    // 让相机呈现的视图进行仿射转换，但照下来的照片没有什么影响

    self.imagePicker.cameraViewTransform = CGAffineTransformMakeRotation(M_PI_2);

     

    /* 摄像头部位

    UIImagePickerControllerCameraDeviceRear, 后置摄像头(默认)

    UIImagePickerControllerCameraDeviceFront 前置摄像头

    */

    self.imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;

     

    /* 设置闪光灯状态

    UIImagePickerControllerCameraFlashModeOff = -1, 照相时，关闭闪光灯

    UIImagePickerControllerCameraFlashModeAuto = 0, 照相时，闪光灯自动调节

    UIImagePickerControllerCameraFlashModeOn = 1 照相时，开启闪光灯

    */

    self.imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;

     

    [self presentViewController:self.imagePicker animated:YES completion:nil];

  • UIImagePickerControllerDelegate委托
    • - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;

      当用户选择图片后会调用此委托方法

      /* info 是一个字典，键分别指示的意思

      UIImagePickerControllerMediaType 文件类型

      UIImagePickerControllerOriginalImage 图片数据(UIImage *类型)

      UIImagePickerControllerReferenceURL 文件地址

      */

    • - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

      当用户点击cancel时调用

      此处可以移除自身模态：[self dismissViewControllerAnimated:YES completion:nil];

• 音频
  • 系统声音（音效）
    • 播放系统声音，无震动

      // 播放系统声音

      AudioServicesPlaySystemSound(1000);

      SystemSounID范围：1000-1351，4095

    • 播放系统声音，可以为系统原有，也可为自己创建的系统声音，有震动

      // 播放声音(有震动)

      AudioServicesPlayAlertSound(soundID);

    • 创建系统声音

      NSString *path = [[NSBundle mainBundle] pathForResource:@"PHONE3" ofType:@"wav"];

      NSURL *url = [NSURL fileURLWithPath:path];

      SystemSoundID soundID;

      AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &soundID);

  • 播放本地音频—AVAudioPlayer
    • 常用属性
      • volume：声音大小
    • 常用方法
      • prepareToPlay：准备播放
      • play：播放音频
      • pause：暂停播放
  • 播放远程音频—AVPlayer、AVPlayerItem
    • AVPlayer
      • 常用属性
        • status：播放的状态

          /*

          AVPlayerStatusUnknown, 未知，还未加载完成

          AVPlayerStatusReadyToPlay, 准备播放

          AVPlayerStatusFailed 加载失败，无网络

          */

        • AvplayerItem *currentItem：当前播放元素
      • 常用方法
        • play
        • pause
        • - (CMTime) currentTime;        获取当前时间

          typedef struct{

              CMTimeValue value;        常用

              CMTimeScale timeScale;    常用

              CMTimeFlags flags;

              CMTimeEpoch epoch;

          }CMTime;

          获取播放元素当前时间：

          float time = [self.avPlayer currentTime].value/[self.avPlayer currentTime]. timeScale;

    • AVPlayerItem
      • 常用属性
        • CMTime duration：播放元素的总时长

          得到总时长：

              float duration = self.playItem.duration.value / self.playerItem.duration.timeScale;

      • 常用方法
        • - (CMTime)currentTime;        播放元素的当前时间
• 视频
  • MPMoviePlayerController        iOS7.0 ~ iOS9.0
  • MPMoviePlayerViewController        iOS7.0 ~ iOS9.0
  • AVPlayerViewController
  • AVPlayerLayer（内含AVPlayer属性）        iOS8.0+