iOS录像和拍照的使用

前言
为什么要把录像和拍照放在一起说呢？因为它们有很多相似的地方，那么我来简单的说一下吧！

1、初始化对象

 UIImagePickerController *pickerController = [[UIImagePickerController alloc]init];

2、区分选择使用摄像头还是相册，默认的是选择相册，所以当选择摄像头设备的时候，需要设置它的sourceType属性：

//摄像头：
     UIImagePickerControllerSourceTypeCamera,
 //相册：
UIImagePickerControllerSourceTypePhotoLibrary,
     UIImagePickerControllerSourceTypeSavedPhotosAlbum

pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

3、首先要导入框架，因为需要的内容不是OC里面的字符串类型，需要强制转换。然后，定义一个BOOL类型的对象来判断拍照摄像的依据。最后，要选择媒体类型，系统默认的媒体类型是kuTTypeImage，所以在拍照的时候不设置媒体类型不会崩溃，但是在录制视频的时候，需要选择kUTTypeMovie，否则就会崩溃。

4、挂上代理，delegate包含两个代理协议UINavigationControllerDelegate和UIImagePickerControllerDelegate。

5、区分是拍照还是录像,系统默认的是拍照，所以在录像是，需要设置它的cameraCaptureMode属性。

//录像 UIImagePickerControllerCameraCaptureModeVideo
// 拍照 UIImagePickerControllerCameraCaptureModePhoto

if (isMovie == YES) {
pickerController.mediaTypes = @[(NSString *)kUTTypeMovie];
pickerController.delegate = self;
 pickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;
    }

另外，还有一些其它的属性：

区分 前后摄像头,用的是 cameraDevice属性
 
 后置摄像头：UIImagePickerControllerCameraDeviceRear,
 
 前置摄像头：UIImagePickerControllerCameraDeviceFront
 

 设置 是否显示  控制控件
  showsCameraControls  默认显示控制控件
 
 设置拍照
 takePicture
 
 录像
 startVideoCapture
 stopVideoCapture
 
 设置视频清晰度videoQuality
 UIImagePickerControllerQualityTypeHigh = 0,       // 高清
 UIImagePickerControllerQualityTypeMedium = 1,     // medium quality,
 UIImagePickerControllerQualityTypeLow = 2,         // lowest quality,
 UIImagePickerControllerQualityType 640x480  // VGA quality
 UIImagePickerControllerQualityTypeIFrame 1280x720
 UIImagePickerControllerQualityTypeIFrame 960x540
 
 设置视频最大录像时间 videoMaximumDuration
 默认10分钟
 
 设置闪光  cameraFlashMode
 UIImagePickerControllerCameraFlashModeOff  = -1,//关闭
 UIImagePickerControllerCameraFlashModeAuto = 0,//自动  默认
 UIImagePickerControllerCameraFlashModeOn   = 1//开启
 
 设置调用摄像头视图页面的 覆盖视图  cameraOverlayView
 
 设置拍照页面的形态  cameraViewTransform

用到的两个代理方法：

// 采集完成之后去调用，不区分拍照 摄像
 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    NSLog(@"完成");
}

// 采集取消的时候调用
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

    NSLog(@"取消");
    [self dismissViewControllerAnimated:YES completion:nil];
}

如何在采集完成代理方法内区分是拍照还是录像？代码如下：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
if ([info[UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie]) {

        NSLog(@"我在录像 录完了");

//        保存视频到相册   
    
UISaveVideoAtPathToSavedPhotosAlbum(info[UIImagePickerControllerMediaType], self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
}
  
  if ([info[UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeImage]) {

        NSLog(@"我在拍照 拍完了");

UIImage *finishImage = info[UIImagePickerControllerOriginalImage];

UIImageWriteToSavedPhotosAlbum(finishImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}

    [self dismissViewControllerAnimated:YES completion:nil];

}