Question

我正在制作改变现实的应用程序。我的主控制器派生自UIImagePickerController。以下是我创建它的方法：

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    if (!self.overlayController) {
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            self.sourceType = UIImagePickerControllerSourceTypeCamera;
            self.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
            self.cameraDevice = UIImagePickerControllerCameraDeviceRear;

            self.showsCameraControls = false;
            self.allowsEditing = false;

            self.overlayController = [[[ControlsViewController alloc] initWithNibName:@"ControlsViewController" bundle:[NSBundle mainBundle] picker:self] autorelease];
            [self.view addSubview:self.overlayController.view]; // need to add as subview otherwise mouse events captured by UIImagePickerController
            self.overlayController.view.frame = CGRectMake(0,0, self.view.frame.size.width, self.view.frame.size.height);
        }
    }
    [cameraControls setCamera:self];
}

基本上控制器存在于应用程序的整个生命周期中。现在，当我在大多数时间下面用代码拍照时它工作正常，但有时候没有调用.FinishPickingMediaWithInfo。通常的行为是我看到相机焦点开始调整模糊输入/输出然后它稳定，但didFinishPickingMediaWithInfo永远不会被调用。看起来如果相机进入某种校准模式，它可能不会触发此事件。谁有解决方案？我希望可能会有某种额外的回调（比如我错过的错误处理）。当相机进入奇怪的校准模式时，我甚至可以听到相机快门模拟声音中断。

//self.cameraPicker points to the instance of my main controller that I created earlier

-(void) setCamera:(UIImagePickerController *)picker {
    self.cameraPicker = picker;
    picker.delegate = self;
}

-(void) takePicture {
    [self.cameraPicker takePicture];
}
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSLog(@"Picture ready");
}

UIImagePickerController didFinishPickingMediaWithInfo有时不被调用

0 个答案: