在ios中一次添加两个摄像头视图

Question

我目前正在实施一个应用程序，其中应该有两个摄像头视图作为两个页面。我使用scrollview来实现分页事件并且它成功了。我现在面临的问题是我无法一次添加两个摄像头视图。我只能放一个。有人可以帮助我。

这是我的屏幕

这是我的代码

#import "CameraViewController.h"
#import "WelcomeViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "PhotoViewController.h"

@interface CameraViewController ()

    @property (strong, nonatomic) UIWindow *window;

@end

@implementation CameraViewController{

    AVCaptureSession *session;

    AVCaptureStillImageOutput *stillImageOutput;

    UIView *view_Photo;

    UIView *view_Document;

    UIScrollView *cameraScroll;
}


int page = 0;

float cameraScrollHeight;

- (void)viewDidLoad {

    [super viewDidLoad];

    cameraScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(X, Y, Width,Height)];

    cameraScroll.pagingEnabled = YES;

    cameraScroll.bounces = NO;

    cameraScroll.showsHorizontalScrollIndicator = NO;

    cameraScroll.showsVerticalScrollIndicator = NO;

    cameraScroll.scrollsToTop = YES;

    NSInteger numberOfViews = 2;

    for (int i = 0; i < numberOfViews; i++) {

        //set the origin of the sub view

        CGFloat myOrigin = i * self.view.frame.size.width;

        //create the sub view and allocate memory

        if (i == 0) {

            view_Photo = [[UIView alloc] initWithFrame:CGRectMake(myOrigin, 0, self.view.frame.size.width, ScrollViewHeight)];

            view_Photo.backgroundColor = [UIColor clearColor];        

        }else{

            view_Document = [[UIView alloc] initWithFrame:CGRectMake(myOrigin, 0, self.view.frame.size.width, ScrollViewHeight)];

            view_Document.backgroundColor = [UIColor clearColor];

        }

        //set the scroll view delegate to self so that we can listen for changes
        cameraScroll.delegate = self;

        //add the subview to the scroll view

        if (i == 0) {

            [cameraScroll addSubview:view_Photo];

        }else{

            [cameraScroll addSubview:view_Document];

        }
    }

    //set the content size of the scroll view, we keep the height same so it will only

    //scroll horizontally

cameraScroll.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews,cameraScrollHeight);

    //we set the origin to the 3rd page

    CGPoint scrollPoint = CGPointMake(0, 0);

    //change the scroll view offset the the 3rd page so it will start from there

    [cameraScroll setContentOffset:scrollPoint animated:YES];

    [self.view addSubview:cameraScroll];

}

//scrolling ends
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    //find the page number you are on
    CGFloat pageWidth = scrollView.frame.size.width;
    page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    NSLog(@"Scrolling - You are now on page %i",page);
}

//dragging ends, please switch off paging to listen for this event
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
                 withVelocity:(CGPoint)velocity
          targetContentOffset:(inout CGPoint *) targetContentOffset
NS_AVAILABLE_IOS(5_0){

    //find the page number you are on
    CGFloat pageWidth = scrollView.frame.size.width;
    page = floor((scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
    NSLog(@"Dragging - You are now on page %i",page);

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

被修改

我忘记将这段代码放在上面的代码中。这个也在我的代码中。

- (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 = [cameraScroll];

     [rootLayer setMasksToBounds:YES];

     CGRect frame = view_Photo;

     [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];


}