In iOS 8 I am having problem capturing images from camera till now I am using this code for
UIImagePickerController *controller=[[UIImagePickerController alloc] init];
controller.videoQuality=UIImagePickerControllerQualityTypeMedium;
controller.delegate=(id)self;
controller.sourceType=UIImagePickerControllerSourceTypeCamera;
[self presentViewController:controller animated:YES completion:nil];
But in iOS 8 I am getting this:
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.
I have tried with the solution provided by This Post with
#property (strong,nonatomic)UIImagePickerController *controller;
_controller=[[UIImagePickerController alloc] init];
_controller.videoQuality=UIImagePickerControllerQualityTypeMedium;
_controller.delegate=(id)self;
_controller.sourceType=UIImagePickerControllerSourceTypeCamera;
_[self presentViewController:controller animated:YES completion:nil];
and this
...
controller.modalPresentationStyle=UIModalPresentationFullScreen;
or
controller.modalPresentationStyle=UIModalPresentationCurrentContext;
...
and this
double delayInSeconds = 0.1;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self presentViewController:controller animated:YES completion:nil];
});
and this
[self presentViewController:controller animated:YES completion:NULL];
and this
[self presentViewController:controller animated:YES completion:^{
}];
any idea?
I'm pretty sure this is just a bug in iOS 8.0. It's reproducible with the simplest of POC apps that does nothing more than attempt to present a UIImagePickerController like you're doing above. Furthermore, there's no alternative pattern to displaying the image picker/camera, to my knowledge. You can even download Apple's Using UIImagePickerController sample app, run it, and it will generate the same error out of the box.
That said, the functionality still works for me. Other than the warning/error, do you have issues with the functioning of your app?
I was struggling with this issue for several hours, i have read every relevant topic and found out that the error was caused because under the privacy settings of my device, the camera access to my app was blocked!!! I have never denied access to camera and i don't know how it was blocked but that was the problem!
I don't have enough reputation points to comment on #greg's answer above, so will add my observations here. I have a Swift project for both iPad and iPhone. I have a method inside my main view controller (relevant bit below). When I test this on a phone, everything works properly and no warnings are generated. When I run it on an iPad, everything works properly but I see the warning about snapshotting the view. The interesting bit, however, is that when I run on an iPad without using the popover controller, everything works properly with no warning. Unfortunately, Apple mandates that the image picker must be used within a popover on iPad, if the camera is not being used.
dispatch_async(dispatch_get_main_queue(), {
let imagePicker: UIImagePickerController = UIImagePickerController();
imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum;
imagePicker.mediaTypes = [kUTTypeImage];
imagePicker.allowsEditing = false;
imagePicker.delegate = self;
if(UIDevice.currentDevice().userInterfaceIdiom == .Pad){ // on a tablet, the image picker is supposed to be in a popover
let popRect: CGRect = buttonRect;
let popover: UIPopoverController = UIPopoverController(contentViewController: imagePicker);
popover.presentPopoverFromRect(popRect, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Up, animated: true);
}else{
self.presentViewController(imagePicker, animated: true, completion: nil);
}
});
I ran into this after calling UIImagePickerController presentViewController: from the callback to a UIAlertView delegate. I solved the issue by pushing the presentViewController: call off the current execution trace using dispatch_async.
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
dispatch_async(dispatch_get_main_queue(), ^{
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
if (buttonIndex == 1)
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
else
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController: imagePickerController
animated: YES
completion: nil];
});
}
I had this issue when animating some views and the app would go into background mode and come back. I handled it by setting a flag isActive. I set it to NO in
- (void)applicationWillResignActive:(UIApplication *)application
and YES in
- (void)applicationDidBecomeActive:(UIApplication *)application
and animate or not animate my views accordingly. Took care of the issue.
I had this with an UIAlertControllerStyleActionSheet giving the user the option to take a photo with the camera or use one from library.
I tried a symbolic breakpoint on the error message
That showed me the error is produced by the intern use of a UICollectionView during presentation
[self presentViewController:alert animated:YES completion:nil];
I fixed this by explixitly setting the frame before presenting
[alert setPreferredContentSize: alert.view.frame.size];
Here is the complete methode that is working without the error
-(void)showImageSourceAlertFromSender:(id)sender{
UIButton *senderButton = (UIButton*)sender;
UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *cameraAction = [UIAlertAction actionWithTitle:#"Camera" style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
[self takePhoto];
}];
UIAlertAction *libraryAction = [UIAlertAction actionWithTitle:#"Library" style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
[self selectPhotoFromLibraryFromSender:sender];
}];
[alert addAction:cameraAction];
[alert addAction:libraryAction];
alert.popoverPresentationController.delegate = self;
alert.popoverPresentationController.sourceRect = senderButton.frame;
alert.popoverPresentationController.sourceView = self.view;
[alert setPreferredContentSize: alert.view.frame.size];
[self presentViewController:alert animated:YES completion:^(){
}];}
You can silence the "Snapshotting a view" warning by referencing the view property before presenting the view controller. Doing so causes the view to load and allows iOS render it before taking the snapshot.
UIAlertController *controller = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
controller.modalPresentationStyle = UIModalPresentationPopover;
controller.popoverPresentationController.barButtonItem = (UIBarButtonItem *)sender;
... setup the UIAlertController ...
[controller view]; // <--- Add to silence the warning.
[self presentViewController:controller animated:YES completion:nil];
For anyone that is seeing an issue with a black preview after image capture, hiding the status bar after the UIPickerController is shown seems to fix the issue.
UIImagePickerControllerSourceType source = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera] ? UIImagePickerControllerSourceTypeCamera : UIImagePickerControllerSourceTypeSavedPhotosAlbum;
UIImagePickerController *cameraController = [[UIImagePickerController alloc] init];
cameraController.delegate = self;
cameraController.sourceType = source;
cameraController.allowsEditing = YES;
[self presentViewController:cameraController animated:YES completion:^{
//iOS 8 bug. the status bar will sometimes not be hidden after the camera is displayed, which causes the preview after an image is captured to be black
if (source == UIImagePickerControllerSourceTypeCamera) {
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
}
}];
I found the same issue and tried everything. I have two different apps, one in objective-C and one in swift - both have the same problem. The error message comes in the debugger and the screen goes black after the first photo. This only happens in iOS >= 8.0, obviously it is a bug.
I found a difficult workaround. Shut off the camera controls with imagePicker.showsCameraControls = false and create your own overlayView that has the missing buttons. There are various tutorials around how to do this.
The strange error message stays, but at least the screen doesn't go black and you have a working app.
This might be a bug of built-in ImagePickerController. My code is working, but occasionally crashes on iPhone 6 Plus.
I've tried all solutions suggested by other answers but there were no luck. Problem finally solved after switching to JPSImagePickerController.
I've tried everything, my problem was that the image picker for the camera and photo library disappeared right after they showed. I solved it with the following line (swift)
imagePicker.modalPresentationStyle = UIModalPresentationStyle.OverCurrentContext
I'm pretty sure this is just a bug in iOS 8.0. It's reproducible with the simplest of POC apps that does nothing more than attempt to present a UIImagePickerController like you're doing above. Furthermore, there's no alternative pattern to displaying the image picker/camera, to my knowledge. You can even download Apple's Using UIImagePickerController sample app, run it, and it will generate the same error out of the box.
That said, the functionality still works for me. Other than the warning/error, do you have issues with the functioning of your app?
If we are using the UIImagePickerController as a property, then this warning will disappear. xcode assume that we are not using the result from the UIImagePickerController , if we are instantiating the UIImagePickerController within a function.
Calling this method worked for me. Place it after presenting your view.
[yourViewBeingPresented.view layoutIfNeeded];
I also encounter the same problem and I resolved it by checking if the camera is available:
BOOL cameraAvailableFlag = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
if (cameraAvailableFlag)
[self performSelector:#selector(showcamera) withObject:nil afterDelay:0.3];
I have came across with this issue. When we call the camera and release the views produced this issue. For an example call an camera and set view nil in viewDidDisappear method this error will come since there is not callback for camera event. Make sure about this case too for this error.
I got the same bug,getting bellow message in console while opening 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.'
For me problem was with the Bundle display name in Info.plist file.it was empty some how,i put my app name there and now it working fine.i did't received any camera permission alert because of empty Bundle display name.it blocked the view from rendering.
the problem was't with view but by presenting it without a permission.you can check it on settings-->privacy-->Camera,if your app not listed there problem might be same.
I'm using Phonegap, but this thread keeps coming as the first one when Googling about the error message.
For me this issue went away by defining the imagetype to PNG.
encodingType : Camera.EncodingType.PNG
So the whole line being:
navigator.camera.getPicture(successFunction, failFunction, { encodingType : Camera.EncodingType.PNG, correctOrientation:true, sourceType : Camera.PictureSourceType .PHOTOLIBRARY, quality: 70, allowEdit : false , destinationType: Camera.DestinationType.DATA_URL});
Your mileage may vary, but that did the trick for me.
Alternatively, consider using drawViewHierarchyInRect:
Swift:
extension UIImage{
class func renderUIViewToImage(viewToBeRendered: UIView) -> UIImage
{
UIGraphicsBeginImageContextWithOptions(viewToBeRendered.bounds.size, true, 0.0)
viewToBeRendered.drawViewHierarchyInRect(viewToBeRendered.bounds, afterScreenUpdates: true)
viewToBeRendered.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return finalImage
}
}
Objective-C:
- (UIImage *)snapshot:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0);
[view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
Also see:
https://developer.apple.com/library/ios/qa/qa1817/_index.html
How to capture UIView to UIImage without loss of quality on retina display
In my case ( XCode 7 and iOS 9 ), I use UINavigationController "hidden", so Ihave to add UINavigationControllerDelegate to present camera or roll and it work like it is supposed to! And pickerControllerDelegate.self doesn't display error either!
I have my app set up so that there will be multiple image pickers, each with it's own array of images. The user will press which set they wish to view, select an image, and then the app will pop back to the Root Controller. I want the image they have selected to be added as a SubView to my main ViewController.
I'm having issues getting the main ViewController to detect the image selected though.
Here's how I am trying:
In my Image Picker:
EDIT I'm having an issue again. I have added a new viewController so the users will choose which set of array of images they want to see instead of going straight to the array of images. I changed the way I pop to the viewController since I am not going back to the RootViewController now.
- (IBAction)buttonClicked:(id)sender
{
UIButton *button = (UIButton *)sender;
_selectedImage = [_images objectAtIndex:button.tag];
AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
delegate.viewController.stampedImage = _selectedImage;
NSLog(#"delegate.viewController = %#", delegate.viewController);
NSLog(#"delegate.viewController.stampedImage = %#", delegate.viewController.stampedImage);
NSLog(#"_selectedImage = %#", _selectedImage);
[delegate.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
}
I've ran an NSLog here and the selectedImage is set to an image.
Here is what I am doing in my main ViewController where I want the image to appear. I am running this code in viewWillAppear:
//stampedImage = _imagePicker.selectedImage; --- Not sure if I need this line
_stampedImageView = [[UIImageView alloc] initWithImage:stampedImage];
NSLog(#"ViewController stampedImage = %#", stampedImage);
[_stampedImageView setFrame:CGRectMake(0, 0, 80.0, 80.0)];
[_stampedImageView setMultipleTouchEnabled:YES];
[_stampedImageView setUserInteractionEnabled:YES];
[imageView addSubview:_stampedImageView];
[_stampedImageView release];
I've ran an NSLog here but the stampedImage always returns as null.
The stampedImage is always coming back as null
I have the stampedImage set as a property and is being synthesized.
I have also set done an #class in the .h for my image picker class.
Any ideas? I'm stumped on this one for some reason.
I have a button where when the user presses it, he is navigated to camera to take a pic.
When he takes the pic, he presses done and gets back to the controller. But when that happens the navigation bar gets up in the screen, gets below the battery/signal bar that the telephone has. The weird thing is that this happens on 4/4s but not on 3gs
It is rather tough to answer the question without knowing a bit more details, but here's some code I use to bring up the camera, take the picture, then close the camera successfully. The method can be called by using one line of code: [self takePhoto];
- (void) takePhoto {
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//Clear out the UI first
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
//picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; -> use this if you want them to select from the library
[self presentViewController:picker animated:YES completion:nil];
} else {
//Device does not support a camera, show a message if desired
}
}
Then you need a delegate for it all so the program knows what to do when an image is taken or selected and how to close, that's what this code is:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
self.workingImage = nil;
//I grab the image and store globally, but first I manually scale and rotate it if necessary
self.workingImage = [self scaleAndRotateImage:[info objectForKey:UIImagePickerControllerOriginalImage]];
//I display the image in my UI view, so this chunk of code will size it properly
CGRect bound;
bound.origin = CGPointZero;
bound.size = img.size;
imageView.bounds = bound;
//Set the UI image view and dismiss the controller
[imageView setImage:self.workingImage];
[picker dismissModalViewControllerAnimated:YES];
}
Obviously, make sure your controller .h implements the delegate properly like so:
#interface ViewController : UIViewController<UIImagePickerControllerDelegate> { ... }
Hope this helps?
I'm pretty new to iOS programming so sorry for any "doh" questions ;)
I wanted to use the wonderful MWPhotoBrowser in my App. I'm using a TabBar Application but I can't figure out how to present the photo browser in my view. Any hints/ideas/code snippets?
Any help is very much appreciated. Thanks
This is what I have in my ViewDidLoad in the ViewController of the View of the Tab:
// Browser
NSMutableArray *photos = [[NSMutableArray alloc] init];
self.photos = [NSMutableArray array];
[photos addObject:[MWPhoto photoWithURL:[NSURL URLWithString:#"URL to 1.jpg"]]];
[photos addObject:[MWPhoto photoWithURL:[NSURL URLWithString:#"URL to 2.jpg"]]];
self.photos = photos;
// Create & present browser
MWPhotoBrowser *browser = [[MWPhotoBrowser alloc] initWithDelegate:self];
browser.displayActionButton = YES; // Show action button to save, copy or email photos
[browser setInitialPageIndex:1]; // Example: allows second image to be presented first
// Present
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:browser];
nc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:nc animated:YES];
I copied this from the Demo but now I have a view thats in front of my tab bar view, but all I want is that photo view inside my tab bar. What am I missing/obviously doing wrong?
Check GitHub link they have sample code demo. Use that sample code to modify your application. https://www.github.com/mwaterfall/MWPhotoBrowser
I'd like to know how to open the camera inside of a pre-defined frame (not the entire screen). When the view loads, I have a box, and inside it, I want to display what the camera sees. I don't want to snap a picture, just basically use the camera as a viewfinder. I have searched this site and have not yet found what I'm looking for. Please help.
Thanks!
Thomas
Update 1:
Here is what I have tried so far.
1.) I added UIImageView to my xib.
2.) Connect the following outlet to the UIImageView in IB
IBOutlet UIImageView *cameraWindow;
3.) I put the following code in viewWillAppear
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
NSLog(#"viewWillAppear ran");
}
But this method does not run, as evident by the absence of NSLog statement from my console. Please help!
Thanks,
Thomas
Update 2:
OK I got it to run by putting the code in viewDidLoad but my camera still doesn't show up...any suggestions? Anyone....? I've been reading the UIImagePickerController class reference, but am kinda unsure how to make sense of it. I'm still learning iPhone, so it's a bit of a struggle. Please help!
- (void)viewDidLoad
{
[super viewDidLoad];
// Create a bool variable "camera" and call isSourceTypeAvailable to see if camera exists on device
BOOL camera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
// If there is a camera, then display the world throught the viewfinder
if(camera)
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
// Since I'm not actually taking a picture, is a delegate function necessary?
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
NSLog(#"Camera is available");
}
// Otherwise, do nothing.
else
NSLog(#"No camera available");
}
Thanks!
Thomas
Update 3:
A-HA! Found this on the Apple Class Reference.
Discussion
The delegate receives notifications
when the user picks an image or movie,
or exits the picker interface. The
delegate also decides when to dismiss
the picker interface, so you must
provide a delegate to use a picker. If
this property is nil, the picker is
dismissed immediately if you try to
show it.
Gonna play around with the delegate now. Then I'm going to read on wtf a delegate is. Backwards? Whatever :-p
Update 4:
The two delegate functions for the class are
– imagePickerController:didFinishPickingMediaWithInfo:
– imagePickerControllerDidCancel:
and since I don't actually want to pick an image or give the user the option to cancel, I am just defining the methods. They should never run though....I think.
add
[picker
dismissModelViewControllerAnimated:YES];
to delegate method bodies.
It will dismiss the view.