UIImagePickerController startVideoCapture与自定义叠加

我正在使用带有自定义叠加层的UIImagePickerController在我的应用中录制video。 为了实现UIImagePickerController，我使用了一个很棒的Ray Wenderlich教程中的代码。

我隐藏了相机的控件，并创建了一个简单的自定义叠加视图。 这已经工作并加载很好。 然后我为视图创建了一个工具栏和按钮，以录制video：

- (BOOL) startCameraControllerFromViewController: (UIViewController*) controller usingDelegate: (id ) delegate { if (([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera] == NO) || (delegate == nil) || (controller == nil)) return NO; UIImagePickerController *cameraUI = [[UIImagePickerController alloc] init]; cameraUI.sourceType = UIImagePickerControllerSourceTypeCamera; // Displays a control that allows the user to choose movie capture cameraUI.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil]; // Hides the controls for moving & scaling pictures, or for // trimming movies. To instead show the controls, use YES. cameraUI.allowsEditing = NO; cameraUI.delegate = delegate; //Overlay view and toolbar setup // creating overlayView UIView* overlayView = [[UIView alloc] initWithFrame:cameraUI.view.frame]; // letting png transparency be float width = 320; float AR = (4.0/3.0); float toolbar_height = 480 - (AR*width); UIToolbar *toolBar=[[UIToolbar alloc]initWithFrame:CGRectMake(0, (AR*width), 320, toolbar_height)]; //toolBar.tintColor = [UIColor colorWithRed:(252/255.) green:(0/255.) blue:(48/255.) alpha:1]; toolBar.tintColor = [UIColor colorWithRed:(49/255.) green:(52/255.) blue:(49/255.) alpha:1]; UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; UIBarButtonItem *RecordBarButtonItem = [[UIBarButtonItem alloc ] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(recordPressed:)]; UIBarButtonItem *CancelBarButtonItem = [[UIBarButtonItem alloc ] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(imagePickerControllerDidCancel:)]; NSArray *buttons = [NSArray arrayWithObjects: CancelBarButtonItem, flexibleSpace, RecordBarButtonItem, flexibleSpace, nil]; [toolBar setItems: buttons animated:NO]; [overlayView addSubview:toolBar]; [overlayView.layer setOpaque:NO]; overlayView.opaque = NO; cameraUI.showsCameraControls = NO; cameraUI.cameraOverlayView = overlayView; [controller presentViewController: cameraUI animated: YES completion:nil]; return YES; } 

我的按钮recordBarButtonItem调用recordPressed ，它由下式给出：

 - (void) recordPressed: (UIImagePickerController *) picker { NSLog(@"lets record"); [picker startVideoCapture]; } 

所以’let record’出现在日志中，但是我收到了startVideoCapture的NSInvalidArgumentException错误。 我知道我试图通过按钮按下开始video捕获的方式有明显错误，但我无法弄明白。 如果解决方案很简单，在iOS上还是相当新手，请原谅我！ 干杯，迈克

Answer 1

问题是您附加到initWithBarButtonSystemItem调用的操作不会传递UIImagePickerController实例。

我要做的是将UIImagePickerController设置为您的类的属性并从您的操作中访问该属性，如下所示：

在你的.h：

 @property (nonatomic, strong) UIImagePickerController *cameraUI; 

在你的.m：

 - (BOOL) startCameraControllerFromViewController: (UIViewController*) controller usingDelegate: (id ) delegate { ... self.cameraUI = [[UIImagePickerController alloc] init]; ... UIBarButtonItem *RecordBarButtonItem = [[UIBarButtonItem alloc ] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(recordPressed)]; // Removed the ':' ... } - (void) recordPressed { NSLog(@"lets record"); [self.cameraUI startVideoCapture]; } 

Answer 2

实际上我刚刚用一些我已经打开的代码快速测试了它，按下按钮的动作的sender是UIBarButtonItem * 。 所以你可以做几件事，你可以找到根源

 UIBarButtonItem *senderButton = (UIBarButtonItem *)sender; if(senderButton.image == UIBarButtonSystemItemCamera) { //Handle behaviour } 

或者为每个按钮设置tag变量并跳过图像检查并查看标签，这可能会使逻辑更容易一些。