ios - 如何保存通过 AVCaptureSession 拍摄的图像

Question

我已经设置了一个自定义相机 View ，该 View 在 View 上有覆盖按钮。一切正常。相机拍照，图片显示在 UIImageView 中。这张图片在 UIImageView 中后如何保存？

下面的代码:

ViewController.h

@interface ViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate> {
}

@property (strong, nonatomic) IBOutlet UIView *frameForCapture;
@property (strong, nonatomic) IBOutlet UIImageView *imageView;

- (IBAction)takePhoto:(id)sender;

ViewController.m

@implementation ViewController

AVCaptureSession *session;

AVCaptureStillImageOutput *stillImageOutput;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

-(void)viewWillAppear:(BOOL)animated{
    session = [[AVCaptureSession alloc]init];
    [session setSessionPreset:AVCaptureSessionPresetPhoto];

    AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSError *error;
    AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];

    if ([session canAddInput:deviceInput]){
        [session addInput:deviceInput];
    }

    AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:session];
    [previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
    CALayer *rootLayer = [[self view]layer];
    [rootLayer setMasksToBounds:YES];
    CGRect frame = self.frameForCapture.frame;

    [previewLayer setFrame:frame];

    [rootLayer insertSublayer:previewLayer atIndex:0];

    stillImageOutput = [[AVCaptureStillImageOutput alloc]init];
    NSDictionary *outputSettings = [[NSDictionary alloc]initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
    [stillImageOutput setOutputSettings:outputSettings];

    [session addOutput:stillImageOutput];

    [session startRunning];
}


- (IBAction)takePhoto:(id)sender {
    AVCaptureConnection *videoConnection = nil;

    for (AVCaptureConnection *connection in stillImageOutput.connections){
        for (AVCaptureInputPort *port in [connection inputPorts]){
            if([[port mediaType] isEqual:AVMediaTypeVideo]){
                videoConnection = connection;
                break;
            }
        }
        if (videoConnection) {
            break;
        }
    }

    [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
        if (imageDataSampleBuffer != NULL) {
            NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
            UIImage *image = [UIImage imageWithData: imageData];
            self.imageView.image = image;
        }
    }];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end

Answer 1

您可以使用此功能将图像保存在设备中

 UIImageWriteToSavedPhotosAlbum(UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo);

如果要在图像保存完成时收到通知，则只需要 completionTarget、completionSelector 和 contextInfo，否则可以传入 nil。