我想要在相机视图中显示两个叠加图像，具体取决于设备方向 - 一个用于水平，一个用于垂直方向（overlay_v.png和overlay_h.png） . 当设备从纵向旋转到垂直方向时，叠加图像也应该更改 .
使用beginGeneratingDeviceOrientationNotifications，我只能确定设备方向，但无法管理更改叠加图像 . 任何帮助/不同的方法将非常感激 .
- (IBAction) getPhoto:(id) sender {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
if((UIButton *) sender == choosePhotoBtn) {
sourceCamera = false;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
} else {
sourceCamera = true;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
//overlay image (cannot dynamically switch from vertical to horizontal in here)
UIImageView *anImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"overlay_v.png"]];
anImageView.frame = CGRectMake(0, 0, anImageView.image.size.width, anImageView.image.size.height);
picker.cameraOverlayView = anImageView;
//device orientation check
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didOrientation:) name:@"UIDeviceOrientationDidChangeNotification" object:nil];
[anImageView release];
}
[self presentModalViewController:picker animated:YES];
}
- (void) didOrientation: (id)object {
UIInterfaceOrientation interfaceOrientation = [[object object] orientation];
if (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
NSLog(@"portrait");
} else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft ){
NSLog(@"landscape");
}
}
1 回答
显示选择器后，您无法更改
cameraOverlayView属性 . 但是，您可以修改视图本身 . 创建名为overlayView的UIView属性 . 将两个图像作为子视图添加到此视图，并使用每个图像上的标记属性轻松地再次抓取该视图 . 隐藏当前方向不应显示的那个 .