I have the following code where I am trying to show a PDF preview. It words perfectly on an iPad however when I am trying to do it on a iPhone it dosnt work.
QLPreviewController* preview = [[QLPreviewController alloc] init];
preview.dataSource = self;
[self dismissViewControllerAnimated:YES completion:^{
[self presentViewController:preview animated:YES completion:nil];
}];
The thread on the iPhone never makes it to this line
[self presentViewController:preview animated:YES completion:nil];
but works fine on ipad.. I am not sure what to even look at. Any help would be appreaciated.
To access the instances/variables (that are declared outside of the block) inside a block, you need to declare those instances/variables like this:
__block type identifier = initial value (optional) e.g, in your case use
__block QLPreviewController* preview = [[QLPreviewController alloc] init];
Try to use
[self.presentingViewController presentViewController:preview animated:YES completion:nil];
instead of
[self presentViewController:preview animated:YES completion:nil];
I used UIImagePickerController to captrue photo from Camera. It used to work, but with iOS8 i am facing crash. Below is the code and crash log.
UIImagePickerController *imagePicker =
[[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
imagePicker.allowsEditing = NO;
[self.navigationController presentViewController:imagePicker animated:YES completion:nil];
- (void)imagePickerControllerDidCancel:(UIImagePickerController *) Picker {
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
}
Logs:
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
-[UIImagePickerController respondsToSelector:]: message sent to deallocated instance
Steps to reproduce the issue is,
1. Click on Camera button in App.
2. Camera opened.
3. Click on Cancel on Camera UI.
4. Click on Camera button again and the App is crashing now.
you should use
[self presentViewController:imagePicker animated:YES completion:nil];
and [self dismissViewControllerAnimated:YES completion:nil];
I was facing the same issue. I resolved it by passing "NO" in animation parameter in both these methods:
[self presentViewController:imagePickerController animated:NO completion:nil];
[self dismissViewControllerAnimated:NO completion:nil];
i'm simply trying to show the camera or photo library so the user can select an image and return to the app. I could finally do it, but the problem that i'm facing, is that when the UIViewController ends (why the user selected an image or why the user pressed cancel) the app works, but events stopped working.
my UIViewController is defined like this:
#interface IOSNativeCb : UIViewController
- (void)imagePickerControllerUIImagePickerController *)picker didFinishPickingMediaWithInfoNSDictionary *)info;
#end
#implementation IOSNativeCb
- (void)imagePickerControllerUIImagePickerController *)picker didFinishPickingMediaWithInfoNSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
[picker release];
//log all the dictionary of the selected image
for (id key in info) {
NSLog(#"key: %#, value: %# \n", key, [info objectForKey:key]);
}
}
//if user canceled
- (void)imagePickerControllerDidCancelUIImagePickerController *)picker {
UIWindow *window = [UIApplication sharedApplication].keyWindow;
[picker dismissViewControllerAnimated:YES completion:^{[self dismissViewControllerAnimated:YES completion:nil];}];
[self removeFromParentViewController];
[window makeKeyAndVisible];
}
#end
and i'm initializing with this from openfl:
const void initAppGallery(){
UIWindow *window = [UIApplication sharedApplication].keyWindow;
IOSNativeCb *wn = [[IOSNativeCb alloc] init];
[window addSubview: wn.view];
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.delegate = wn;
[wn presentModalViewController:picker animated:YES];
[picker release];
}
tried several things in how i remove or dismiss the UIViewController to see if maybe the view still was principal and for that reason the events didn't worked anymore, but nothing so far.
any ideas of what i could try? anyone had any problem like this? is my first time coding in objetive-c + haxe, so i'm a bit lost of what functions or things could be the problem. i'm coding blind in a language i barely know.
Regards.
Some things that could help you find the error:
Use window.rootViewController = wn instead of [window addSubview:wn.view]
Don't release the picker after calling [picker dismissModalViewControllerAnimated:YES]. You already released the picker once on the initAppGallery method, so releasing it again could lead to unknown problems (probably crashes)
Calling [window makeKeyAndVisible] should be done at the end of initAppGallery.
Take also a look to this question, it might help you a bit.
the solution was more simple, i just added after [self removeFromParentViewController];:
[self.view removeFromSuperview];
and worked :D
I am getting this error only in iOS 7 and the application crashed.
In iOS 6, I never get any error, just once of memory warning when opening the camera.
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
Here is what I am doing.
imagePicker = [[UIImagePickerController alloc] init];
[imagePicker setDelegate:self];
[imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
[imagePicker setAllowsEditing:YES];
[self presentModalViewController:imagePicker animated:YES];
I did tried to delay the presentModalViewController, but I am still getting the same message. After few seconds (7-10), the application crashed.
This error is only present in iOS 7.
Anybody has the clue?
The problem in iOS7 has to do with transitions. It seems that if a previous transition didn't complete and you launch a new one, iOS7 messes the views, where iOS6 seems to manage it correctly.
You should initialize your Camera in your UIViewController, only after the view has Loaded and with a timeout:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
//show camera...
if (!hasLoadedCamera)
[self performSelector:#selector(showcamera) withObject:nil afterDelay:0.3];
}
and here is the initialization code
- (void)showcamera {
imagePicker = [[UIImagePickerController alloc] init];
[imagePicker setDelegate:self];
[imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
[imagePicker setAllowsEditing:YES];
[self presentModalViewController:imagePicker animated:YES];
}
This error also showed up for me with Apple's PhotoPicker sample code project.
I was using Xcode Version 5.0 and iOS 7.0.3 on an iPhone 4.
Steps to Reproduce:
Download Apple's PhotoPicker sample project at
https://developer.apple.com/library/ios/samplecode/PhotoPicker/Introduction/Intro.html
In APLViewController.m comment out line 125
//imagePickerController.showsCameraControls = NO;
In APLViewController.m comment out lines 130-133
//[[NSBundle mainBundle] loadNibNamed:#"OverlayView" owner:self options:nil];
// self.overlayView.frame = imagePickerController.cameraOverlayView.frame;
// imagePickerController.cameraOverlayView = self.overlayView;
// self.overlayView = nil;
Build and launch the app.
Once launched, rotate device to Landscape mode.
Click Camera icon to open UIImagePickerController in Camera mode.
View the console output.
Console output
PhotoPicker[240:60b] Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
showsCameraControls property
The problem occurs for me when this has a value of YES (the default).
Setting this to NO eliminated the message.
Bug report
I just filed a bug report with Apple.
I've tried many of the suggestions that have been made in different posts, but have not found a satisfactory workaround.
I got the problem when I tried to present the camera view inside of a popover. Under iOS6 this was no problem but in iOS7 I got the message
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
as well.
However after I changed the presentation of the camera view to fullscreen as described in Taking Pictures and Movies, iOS Developer Library everything went fine again and the message never appeared again. However I had to make sure that depending on in which mode the app is (i.e., presenting camera view or photo roll) I had to either dismiss the popover or the view controller whenever the method - (void) imagePickerControllerDidCancel: (UIImagePickerController *) picker was called.
create a property
#property (nonatomic) UIImagePickerController *imagePickerController;
Then
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.modalPresentationStyle = UIModalPresentationCurrentContext;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
self.imagePickerController = picker;
[self presentViewController:self.imagePickerController animated:YES completion:nil];
This should solve the problem
I used this code to workaround the problem:
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
[imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
[imagePicker setDelegate:self];
if ([self respondsToSelector:#selector(presentViewController:animated:completion:)]){
[imagePicker setShowsCameraControls:NO];
[self presentViewController:imagePicker animated:YES completion:^{
[imagePicker setShowsCameraControls:YES];
}];
} else {
[imagePicker setShowsCameraControls:YES];
[self presentModalViewController:imagePicker animated:YES];
}
I have the same issue and found a solve. I think, that error related with orientation of your application. My application uses only landscape mode, but UIImagePickerController use portrait mode. I add try-catch block to main.m, and get real exception:
Supported orientations has no common orientation with the application, and shouldAutorotate is returning YES
How i solve this problem:
1) Recheck device orientation in Target->General, or .plist file: Supported interface orientations : Landscape left, Landscape right.
2) Add in AppDelegate.m:
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
return UIInterfaceOrientationMaskLandscape | UIInterfaceOrientationMaskPortrait;
}
After this step UIImagePickerController works properly, but my viewcontrollers can be rotated to portrait mode. So, to solve this:
3) Create a category for UINavigationController, (supportedInterfaceOrientations moved from UIViewController to UINavigationController in iOS6):
#implementation UINavigationController (RotationIOS6)
- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskLandscape;
}
#end
This solution works properly on iOS 6.0, 6.1, 7.0. Hope this helps.
I get this error when building app with iOS SDK 6.1, deployment target iOS 6.1 and running app on iOS 7 powered iPhone. App doesn't crash but implementing UIViewController shouldAutorotate method helps me to remove error message.
- (BOOL)shouldAutorotate {
return YES;
}
I had the same issue when I was trying to modify the demo app that come with the Avirary SDK,
in the demo app, it can only edit the photo picked from the camera roll. To try to edit the photo by capturing from camera, I first added the following code in the UIViewcontroller.m file:
#pragma mark - Take Picture from Camera
- (void)showCamera
{
//[self launchPhotoEditorWithImage:sampleImage highResolutionImage:nil];
if ([self hasValidAPIKey]) {
UIImagePickerController * imagePicker = [UIImagePickerController new];
[imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
[imagePicker setDelegate:self];
[imagePicker setAllowsEditing:YES]; //important, must have
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
[self presentViewController:imagePicker animated:YES completion:nil];
}else{
[self presentViewControllerInPopover:imagePicker];
}
}
}
Then when I run the app, the error occurred:
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
To solve the error, modified the UIImagePicker delegate in your UIViewContooler.m file as shown below:
#pragma mark - UIImagePicker Delegate
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSURL * assetURL = [info objectForKey:UIImagePickerControllerReferenceURL];
void(^completion)(void) = ^(void){
[[self assetLibrary] assetForURL:assetURL resultBlock:^(ALAsset *asset) {
if (asset){
[self launchEditorWithAsset:asset];
}
} failureBlock:^(NSError *error) {
[[[UIAlertView alloc] initWithTitle:#"Error" message:#"Please enable access to your device's photos." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil] show];
}];
UIImage * editedImage = [info objectForKey:UIImagePickerControllerEditedImage];
if(editedImage){
[self launchPhotoEditorWithImage:editedImage highResolutionImage:editedImage];
}
};
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
[self dismissViewControllerAnimated:YES completion:completion];
}else{
[self dismissPopoverWithCompletion:completion];
}
}
Then the error disappeared and the app works!
Try this, use
[self performSelector:#selector(presentCameraView) withObject:nil afterDelay:1.0f];
and function
-(void)presentCameraView{
[self presentViewController:imagePicker animated:YES completion:nil];
}
to replace. [self presentModalViewController:imagePicker animated:YES];
and of cause make imagePicker as a global variable.
This is what fixed it for me on my app, ymmv
first off it is a iPhone - iPad app
in appname-Info.plist. in the Supported interface orientations(iPad) showed 4 orientations.
in the Supported interface orientations showed 3 orientations. I added the fourth and ran the app, no debug output.
Hope this helps.
I've just encountered the same issue. In my case the problem was that I had some non-ARC code and I've migrated it to ARC. When I did the migration, I didn't hold a strong reference to the UIImagePickerController and that was the reason for the crash.
Hope it helps :)
I had same issue in iOS 8, But the Camera Access was Disable inside Settings--> Privacy for my App. Just Enabled it, and It was working.
I spent long time try to find the solution, and surprisingly I have found it at the end and it was just very funny once I discovered it.
Here is what you will do to retrieve the image you picked and resume working :)
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
UIImage* pickedImage = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
[composeImageView setImage:pickedImage];
[picker dismissViewControllerAnimated:YES completion:nil];
}
Yes, to solve the issue, you only need to dismiss the picker normally as it seems this message: "Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates." stops the picker from being responsive but you can dismiss it and retrieve the image normally.
In my case it was related with a layout change: the VC presenting the UIImagePickerViewController has the status bar hidden, but the UIImagePickerViewController hasn't.
So, I solved it hiding the status bar in the UIImagePickerViewController as it's shown in this answer.
Not directly answering your question but you mentioned you had a memory warning ,you might be storing the raw image in a property which can lead to a memory warning. This is because the raw image takes up roughly 30MB of memory. I noticed a similar memory warning when testing apps on iOS6 which were on the iPhone 4 series. I still got this warning when the devices were upgraded to iOS7. There is no memory warning when testing on iPhone 5 series on iOS7.
Changing
[self presentViewController:imagePicker animated:YES completion:nil];
to
[self presentViewController:imagePicker animated:YES completion:NULL];
fixed the issue for me.
In iOS5 you could use this snippet to force the orientation:
UIViewController *c = [[UIViewController alloc]init];
[self presentModalViewController:c animated:NO];
[self dismissModalViewControllerAnimated:NO];
[c release];
However this causes an EXC_BAD_ACCESS in iOS6. How can a certain orientation be forced in iOS6?
Just to complete the previous answer, you should do this:
UIViewController *viewController = [[UIViewController alloc] init];
[self presentViewController:viewController animated:NO completion:^{
[viewController dismissModalViewControllerAnimated:NO];
}];
And iOS 6 is no longer under NDA.
In case anyone still cares about this, here's the iOS6 code snippet (I placed it in my viewDidLoad routine):
UIViewController *viewController = [[UIViewController alloc] init];
viewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:viewController animated:NO completion:^{
[self dismissViewControllerAnimated:NO completion:nil];
}];
At first presentModalViewController and dismissModalViewControllerAnimated are deprecated and probably iOS6 will not use these methods correctly. You should use similar methods with complition block instead.
The second thing is that [self dismissModalViewControllerAnimated:NO]; tries to dismiss self firstly. Is this correct in your case?
And last thing iOS6 is under NDA