iPad iOS7 - UIPopoverController中的UIImagePickerController具有错误的预览图像 [英] iPad iOS7 - UIImagePickerController in UIPopoverController has wrong preview image
问题描述
我在UIPopoverController中使用UIImagePickerController，它与iOS6完美配合。使用iOS 7时，显示捕获图像的预览图像会旋转，但如果我拍照，则会正确保存。
这是我如何获取选择器：
UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.mediaTypes = [NSArray arrayWithObjects：
（NSString *）kUTTypeImage，
nil];
imagePicker.allowsEditing = NO;
并将其添加到popover控制器：
self.imagePickerPopOver = [[UIPopoverController alloc] initWithContentViewController：imagePicker];
[self.imagePickerPopOver presentPopoverFromRect：CGRectMake（aPosViewA.x，cameraButton_y，100.0,30.0）inView：self.detailViewController.view allowedArrowDirections：UIPopoverArrowDirectionAny animated：YES];
这些是UIScrollView上按钮位置的计算，用于显示正确位置的弹出窗口：
presentPopoverFromRect：CGRectMake（aPosViewA.x，cameraButton_y，100.0,30.0）
我不认为问题就在那里，因为我尝试了几种组合。
我有还尝试以全屏模式捕获图像，但应用程序仅允许使用横向模式。如果以纵向模式拍摄图像并且取消模态视图，则应用程序也将保持纵向模式。如果模态视图被解除，我找不到阻止UIImagePickerController切换到纵向模式或强制应用程序回到横向模式的方法。
UPDATE
我已经从这里并且更进一步。
我转换后的视图在显示弹出窗口之前创建选择器：
switch（[UIApplication sharedApplication] .statusBarOrientation）{
case UIInterfaceOrientationLandscapeLeft：
self.imagePicker.view.transform = CGAffineTransformMakeRotation（M_PI / 2）;
休息;
case UIInterfaceOrientationLandscapeRight：
self.imagePicker.view.transform = CGAffineTransformMakeRotation（-M_PI / 2）;
休息;
默认值：
break;
}
只要我不转身iPad就可以使用。为此，我正在注册方向更改事件：
[[NSNotificationCenter defaultCenter] addObserver：self selector：@selector（orientationChanged： ）name：UIDeviceOrientationDidChangeNotification对象：nil];
并更改选择器视图：
- （void）orientationChanged：（NSNotification *）notification {
if（self.imagePicker）{
switch（[UIApplication sharedApplication] .statusBarOrientation）{
case UIInterfaceOrientationLandscapeLeft：
self.imagePicker.view.transform = CGAffineTransformMakeRotation（M_PI / 2）;
休息;
case UIInterfaceOrientationLandscapeRight：
self.imagePicker.view.transform = CGAffineTransformMakeRotation（-M_PI / 2）;
休息;
默认值：
break;
}
}
}
剩余问题：
正如我在开始时写的那样，当拍摄照片时，它被正确地显示为接受或驳回它。现在也改变了。不知何故，我需要知道何时拍摄图像并将其转换回来。
并且，这真是一个讨厌的黑客，可能无法与下一个iOS更新一起使用。有没有人知道如何以更清洁的方式实现它？
UPDATE 2
这太糟糕了，我找到了一个更清晰的解决方案来解决我的问题，但不是关于弹出式控制器中的图像拾取器的初始问题的答案，这不是Apple推荐的，但是允许的。
<我现在已经将UIImagePickerController子类化为：
@implementation QPImagePickerController
- （BOOL） shouldAutorotateToInterfaceOrientation：（UIInterfaceOrientation）toInterfaceOrientation {
return UIInterfaceOrientationIsLandscape（toInterfaceOrientation）;
}
- （BOOL）shouldAutorotate {
返回YES;
}
- （NSUInteger）supportedInterfaceOrientations {
返回UIInterfaceOrientationMaskLandscape;
}
@end
我正在使用imagepicker全屏而不是弹出窗口。到目前为止在iOS7中测试过。
UIImagePickerController有一个名为cameraViewTransform的属性。对此应用CGAffineTransform将转换预览图像，但不会转换捕获的图像，因此将正确捕获该图像。我有同样的问题，你描述并解决了它（对于iOS7），通过创建我的相机控制器并将其放置在弹出框中，如下所示：
UIImagePickerController * imagePickerController = [[UIImagePickerController alloc] init];
[imagePickerController setDelegate：self];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
CGFloat scaleFactor = 1.3f;
switch（[UIApplication sharedApplication] .statusBarOrientation）{
case UIInterfaceOrientationLandscapeLeft：
imagePickerController.cameraViewTransform = CGAffineTransformScale（CGAffineTransformMakeRotation（M_PI * 90 / 180.0） ），scaleFactor，scaleFactor）;
休息;
case UIInterfaceOrientationLandscapeRight：
imagePickerController.cameraViewTransform = CGAffineTransformScale（CGAffineTransformMakeRotation（M_PI * -90 / 180.0），scaleFactor，scaleFactor）;
休息;
case UIInterfaceOrientationPortraitUpsideDown：
imagePickerController.cameraViewTransform = CGAffineTransformMakeRotation（M_PI * 180 / 180.0）;
休息;
默认值：
break;
}
__popoverController = [[UIPopoverController alloc] initWithContentViewController：imagePickerController];
[__popoverController presentPopoverFromRect：presentationRect inView：self.view allowedArrowDirections：UIPopoverArrowDirectionAny animated：YES];
我还在横向拍摄时缩放图像，使其比其他情况更能填充取景器。在我看来，这一切都很讨厌，但是一旦iOS7.1到货，我希望能够删除它。
I am using an UIImagePickerController within an UIPopoverController which is working perfectly with iOS6. With iOS 7 the "preview" image which is shown to capture the image is rotated, but if I take a picture it is saved correctly.
This is how I get my picker:
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.mediaTypes = [NSArray arrayWithObjects:
(NSString *) kUTTypeImage,
nil];
imagePicker.allowsEditing = NO;
And add it to a popover controller:
self.imagePickerPopOver = [[UIPopoverController alloc] initWithContentViewController:imagePicker];
[self.imagePickerPopOver presentPopoverFromRect:CGRectMake(aPosViewA.x, cameraButton_y, 100.0, 30.0) inView:self.detailViewController.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
Those are calculations for the button position at a UIScrollView to show the popover at the correct position:
presentPopoverFromRect:CGRectMake(aPosViewA.x, cameraButton_y, 100.0, 30.0)
I don't think that the problem lies there as I have tried out several combinations.
I have also tried to capture the image in fullscreen-mode, but the app is only allowed to use landscape mode. If the image is taken in portrait-mode and the modal view is dismissed, the app stays in portrait mode as well. I couldn't find a way to prevent the UIImagePickerController to switch to portrait mode or to force the app back to landscape mode if the modal view was dismissed.
UPDATE
I have taken the answer from here and came a step further.
I transform the view after creating the picker and before showing the popover :
switch ([UIApplication sharedApplication].statusBarOrientation) {
case UIInterfaceOrientationLandscapeLeft:
self.imagePicker.view.transform = CGAffineTransformMakeRotation(M_PI/2);
break;
case UIInterfaceOrientationLandscapeRight:
self.imagePicker.view.transform = CGAffineTransformMakeRotation(-M_PI/2);
break;
default:
break;
}
which works as long as i don't turn around the iPad. For that I am registering for the orientation changed event:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];
and change the picker view:
- (void)orientationChanged:(NSNotification *)notification{
if (self.imagePicker) {
switch ([UIApplication sharedApplication].statusBarOrientation) {
case UIInterfaceOrientationLandscapeLeft:
self.imagePicker.view.transform = CGAffineTransformMakeRotation(M_PI/2);
break;
case UIInterfaceOrientationLandscapeRight:
self.imagePicker.view.transform = CGAffineTransformMakeRotation(-M_PI/2);
break;
default:
break;
}
}
}
REMAINING PROBLEM: As I wrote in the beginning, when the picture was taken, it was shown correctly to accept or dismiss it. This is now transformed as well. Somehow I need to know when the image is taken and transform it back.
AND, this is really a nasty hack and probably won't work with the next iOS Update. Has anybody an idea how to implement that in a cleaner way?
UPDATE 2
This was too nasty, I have found a cleaner solution which solves my problem but is not the answer to the initial question regarding an imagepicker in a popover controller, which is not recommended by Apple, but allowed.
I have subclassed now the UIImagePickerController like this:
@implementation QPImagePickerController
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);
}
- (BOOL)shouldAutorotate {
return YES;
}
- (NSUInteger)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskLandscape;
}
@end
and I am using the imagepicker in fullscreen instead in a popover. Tested so far in iOS7.
The UIImagePickerController has a property called cameraViewTransform. Applying a CGAffineTransform to this will transform the preview image but will not transform the captured image which will therefore be correctly captured. I have the same problem that you describe and I solved it (for iOS7) by creating my camera controller and placing it in a popover as follows:
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
[imagePickerController setDelegate:self];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
CGFloat scaleFactor=1.3f;
switch ([UIApplication sharedApplication].statusBarOrientation) {
case UIInterfaceOrientationLandscapeLeft:
imagePickerController.cameraViewTransform = CGAffineTransformScale(CGAffineTransformMakeRotation(M_PI * 90 / 180.0), scaleFactor, scaleFactor);
break;
case UIInterfaceOrientationLandscapeRight:
imagePickerController.cameraViewTransform = CGAffineTransformScale(CGAffineTransformMakeRotation(M_PI * -90 / 180.0), scaleFactor, scaleFactor);
break;
case UIInterfaceOrientationPortraitUpsideDown:
imagePickerController.cameraViewTransform = CGAffineTransformMakeRotation(M_PI * 180 / 180.0);
break;
default:
break;
}
__popoverController = [[UIPopoverController alloc] initWithContentViewController:imagePickerController];
[__popoverController presentPopoverFromRect:presentationRect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
I also scale the image when in Landscape so that it fills the viewfinder more than it otherwise would. To my mind this is all rather nasty, but I will hopefully be able to remove it once iOS7.1 arrives.
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