如何创建cameraOverlayView

Question

我真的很难想清楚该怎么做。我有一个工作良好的UIImagePickerController，但是我想创建自己的CameraOverlayView，这样我就可以定制按钮了。我似乎一开始就想不出如何创建覆盖。我已经尝试了这么多教程，并达成了以下内容，但这是远远不够的。有人能指给我一个简单的指令吗？

• 我已经创建了一个使用标准控件的UIImagePickerController。
• 对于覆盖，我在我的故事板上创建了一个新的UIViewController，并将它链接到一个名为ObViewControllerCameraOverlay的新类。
• 在startCameraControllerFromViewController方法中，我使用以下方法隐藏标准控件 cameraUI.showsCameraControls=NO；
• 然后显示cameraOverlay (它不编译) obViewControllerCameraOverlay *overlay = [obViewControllerCameraOverlay alloc；cameraUI.cameraOverlayView = overlay；

我知道我做错了这件事，但我不知道该怎么做。我也看过苹果的PhotoPicker，但我就是不明白。

更新：

我现在所处的位置--有人能告诉我这是否是正确的过程(我意识到帧大小需要排序，需要添加自定义按钮)：

.m文件，其中的‘采取照片’UIButton的位置。

@property (nonatomic, strong) UIView *overlay;

- (IBAction)takePhoto:(id)sender
{
[self startCameraControllerFromViewController: self usingDelegate: self];
}


- (BOOL) startCameraControllerFromViewController: (UIViewController*) controller usingDelegate: (id <UIImagePickerControllerDelegate, UINavigationControllerDelegate>) delegate
{
if (([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera] == NO) || (delegate == nil) || (controller == nil)) return NO;
UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init];
cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraUI.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerCameraCaptureModePhoto];
cameraUI.showsCameraControls=NO;
overlay = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
cameraUI.cameraOverlayView = overlay;
cameraUI.allowsEditing = NO;
cameraUI.delegate = delegate;
[controller presentViewController:cameraUI animated:YES completion:nil];
return YES;
}

Answer 1

您的overlay只被分配-而不是初始化。它应该被初始化，它应该有适当的设置它的框架。

另外：overlayView应该是UIView *类型的。如果要将UIViewController作为覆盖视图传递，则必须只传递它的view属性。

例如：

obViewControllerCameraOverlay *overlay = [storyboard instantiateViewControllerWithIdentifier: @"obViewControllerCameraOverlay"];

cameraUI.cameraOverlayView = overlay.view;

当然，您应该根据您的项目和配置更改代码。

Answer 2

我已经很晚了，但是下面是我用来创建UIImagePickerController和CameraOverlayView的代码。如果您希望摄像机在视图控制器打开时立即出现，请确保您像我一样在UIImagePickerController中初始化viewDidAppear (viewDidLoad不工作)。

@interface CameraViewController ()
@property UIImagePickerController *PickerController;
@property CGFloat HeightOfButtons;
@end


- (UIView *)createCustomOverlayView
{

    // Main overlay view created
    UIView *main_overlay_view = [[UIView alloc] initWithFrame:self.view.bounds];

    // Clear view (live camera feed) created and added to main overlay view
    // ------------------------------------------------------------------------
    UIView *clear_view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - self.HeightOfButtons)];
    clear_view.opaque = NO;
    clear_view.backgroundColor = [UIColor clearColor];
    [main_overlay_view addSubview:clear_view];
    // ------------------------------------------------------------------------


    // Creates two red buttons on the bottom of the view (on top of the live camera feed)
    // Then adds the buttons to the main overlay view
    // You can, of course, customize these buttons however you want
    // ------------------------------------------------------------------------
    for(int i = 0; i < 2; i++) {
        self.HeightOfButtons = 100;
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        // when a button is touched, UIImagePickerController snaps a picture
        [button addTarget:self action:@selector(testIfButtonResponds) forControlEvents:UIControlEventTouchUpInside];
        button.frame = CGRectMake( i * self.view.frame.size.width / 2, self.view.frame.size.height - self.HeightOfButtons, self.view.frame.size.width / 2, self.HeightOfButtons);
        [button setBackgroundColor:[UIColor redColor]];
        [main_overlay_view addSubview:button];
    }
    // ------------------------------------------------------------------------

    return main_overlay_view;
}

- (void)makeCustomCameraAppear
{
    self.PickerController = [[UIImagePickerController alloc] init];
    self.PickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    self.PickerController.showsCameraControls = NO;
    self.PickerController.delegate = self;

    UIView *overlay_view = [self createCustomOverlayView];
    [self.PickerController setCameraOverlayView:overlay_view];

    [self presentViewController:self.PickerController animated:YES completion:NULL];
}

- (void)viewDidAppear:(BOOL)animated
{
    [self makeCustomCameraAppear];
}