在打开的相机上展示相机胶卷 UIImagePickerController

Question

在我的应用程序中，我在打开的相机上有一个cameraOverlayView，带有相机按钮的自定义控件。该应用程序允许用户在关闭相机之前拍摄多张照片，因此快门按钮不会调用dismissViewControllerAnimated，而是在您完成拍照时有一个关闭按钮。

现在，相机叠加层上的按钮之一是图库按钮，允许用户选择保存的图像而不是拍摄新图像。我尝试了两种不同的方法来完成这项工作，但都失败了。

第一种方法

使用当前呈现覆盖的相同UIImagePickerController 实例并将sourceType 切换到库。它确实会显示画廊，但是当点击照片时，我无法在不关闭整个叠加层的情况下关闭厨房。

第二种方法

创建UIImagePickerController 的单独实例，将sourceType 设置为图库并尝试调用presentViewController，然后失败并显示警告：

“警告：尝试在 谁的视野不在窗内 等级制度！”

有没有人可以解决这个问题？这甚至可能吗？

Answer 1

试试这个~~我认为这是你的目标。

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIImagePickerController *imagePicker;

@end

@implementation ViewController

@synthesize imagePicker = _imagePicker;

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

}


- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:YES];

    sleep(2);

    _imagePicker = [[UIImagePickerController alloc] init];
    [_imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
    [_imagePicker setDelegate:self];

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 50, 100, 30)];
    [button setTitle:@"Library" forState:UIControlStateNormal];
    [button setBackgroundColor:[UIColor darkGrayColor]];
    [button addTarget:self action:@selector(gotoLibrary:) forControlEvents:UIControlEventTouchUpInside];

    [_imagePicker.view addSubview:button];

    [self presentViewController:_imagePicker animated:YES completion:nil];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)gotoLibrary:(id)sender
{
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    [imagePicker.view setFrame:CGRectMake(0, 80, 320, 350)];
    [imagePicker setSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
    [imagePicker setDelegate:self];

    [_imagePicker presentViewController:imagePicker animated:YES completion:nil];
}


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
@end

Answer 2

第二种方法是正确的。 我没有看到您的代码，但我认为您的控制器层次结构类似于：

主 VC ---present---> 相机 VC

所以，如果你打电话

[self presentViewController:picker animated:YES completion:^{}];

在您的主 VC 中，您正试图从“隐藏”的 VC（被相机 VC 覆盖）中显示另一个 VC。

关键是引用您的相机 VC（我们称之为 cameraVC）并在 Main VC 中执行类似的操作：

 [cameraVC presentViewController:theOtherPicker animated:YES completion:^{}];

这样做，“当前”动作由相机 VC（可见）完成，没有警告，而不是由隐藏的主 VC。

Answer 3

您可以编写自己的自定义图库视图来选择照片，然后将其添加到 cameraOverlayView 子视图层次结构中。

GitHub 上一定有开源项目，展示了如何在某个地方制作这些视图。或者，如果您不想从头开始，我恰好有 released a control very similar 来满足您的需求。

这确实是一个非常简单的过程 - 一个集合视图，其数据源由 AssetsLibrary 框架支持。

Answer 4

我将按如下方式设置捕获会话：

- (void)setupCaptureSession
{
    NSError* error = nil;

    // Create the session
    _captureSession = [[AVCaptureSession alloc] init];    
    _captureSession.sessionPreset = AVCaptureSessionPresetMedium;
    AVCaptureDevice* device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    AVCaptureDeviceInput* input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

    [_captureSession addInput:input];
    AVCaptureVideoDataOutput* output = [[AVCaptureVideoDataOutput alloc] init];
    [_captureSession addOutput:output];

    // Configure your output.
   dispatch_queue_t queue = dispatch_queue_create("myCameraOutputQueue", NULL);
   //If you want to sebsequently use the data, then implement the delegate.
   [output setSampleBufferDelegate:self queue:queue]; 
}

完成后，您可以按如下方式创建预览层：

_previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_captureSession];
[_captureSession startRunning];

然后将预览层添加到您的视图中：

_myView.layer addSubLayer:_previewLayer];

现在您已经设置好了，我将添加一个自定义图像选择器，例如：https://github.com/arturgrigor/AGImagePickerController

Answer 5

我展示了一个自定义相机视图控制器，我在其上添加了一个“SourceTypeCamera”UIImagePickerController 作为包含的子视图控制器。我的自定义视图控制器有一个按钮，该按钮又添加了另一个 UIImagePickerController 实例，这是一个“SourceTypePhotoLibrary”。

你最终得到一个嵌套的视图控制器层次结构：

• 根/主视图控制器——呈现：
• 我的自定义相机视图控制器– 添加为子视图控制器：
• 任一相机或照片库UIImagePickerController

类似这样的：

- (void)viewDidLoad { (id<UIImagePickerControllerDelegate,UINavigationControllerDelegate>)theDelegate {
    [super viewDidLoad];
    [self startImagePickerWithSourceType:UIImagePickerControllerSourceTypeCamera
                                delegate:self];
    // configure button in camera overlay to call -pickPhotoTapped
}

- (void) pickPhotoTapped {
    [self startImagePickerWithSourceType:UIImagePickerControllerSourceTypePhotoLibrary
                                delegate:self];
}

- (BOOL) startImagePickerWithSourceType:(UIImagePickerControllerSourceType)sourceType
                               delegate:(id<UIImagePickerControllerDelegate,UINavigationControllerDelegate>)theDelegate {
    if (([UIImagePickerController isSourceTypeAvailable:sourceType] == NO)
            || (theDelegate == nil))
        return NO;

    self.cameraUI = [[UIImagePickerController alloc] init];
    self.cameraUI.sourceType = sourceType;
    self.cameraUI.view.frame = self.view.bounds;
    self.cameraUI.delegate = theDelegate;

    if (sourceType == UIImagePickerControllerSourceTypeCamera) {
        self.cameraUI.allowsEditing = NO;
        self.cameraUI.showsCameraControls = NO;
        self.cameraUI.cameraOverlayView = [self overlayView];
    }

    [self addChildViewController:self.cameraUI];
    [self.view addSubview:self.cameraUI.view];
    [self.cameraUI didMoveToParentViewController:self];

    return YES;
}