Camera freezes if didFinishPickingMediaWithInfo is defined - iphone

I'm trying to do a basic picture taking with iPhone. I used the following code to show the camera:
- (BOOL) startCameraControllerFromViewController: (UIViewController*) controller
usingDelegate: (id <UIImagePickerControllerDelegate,
UINavigationControllerDelegate>) 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 picture or
// movie capture, if both are available:
cameraUI.mediaTypes =
[UIImagePickerController availableMediaTypesForSourceType:
UIImagePickerControllerSourceTypeCamera];
// Hides the controls for moving & scaling pictures, or for
// trimming movies. To instead show the controls, use YES.
cameraUI.allowsEditing = NO;
cameraUI.delegate = delegate;
[controller presentModalViewController: cameraUI animated: YES];
return YES;
}
This works fine, but then if I define the handling function:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
}
The imagePicker control freezes after pressing the Use button. It doesn't crash, doesn't throw any exception, the code is doing something, but on the screen I just see the frozen imagePicker control. Even if the handler is empty the control freezes. If I remove the handler, the camera disappears normally and shows the view from where the camera was activated...
Did I miss something essential here?
UPDATE:
I tried assigning the image to an UIImageView, the code executes, exits the function and that's it, the camera remains on the screen:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[[picker parentViewController] dismissModalViewControllerAnimated:YES];
UIImage* original =[info objectForKey:#"UIImagePickerControllerOriginalImage"];
[[self imgWLItemImage] setImage:[UIImage imageWithCGImage:original.CGImage scale:0.25 orientation:original.imageOrientation]];
}

Try this & check:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissModalViewControllerAnimated:YES];
UIImage* original =[info objectForKey:#"UIImagePickerControllerOriginalImage"];
[[self imgWLItemImage] setImage:[UIImage imageWithCGImage:original.CGImage scale:0.25 orientation:original.imageOrientation]];
}

Related

UIImagePickerController pixelated image from choosing too quickly, before image fully loaded

I am using UIImagePickerController in an iOS app to save an image in context using UIGraphicsBeginImageContext/UIGraphicsBeginImageContextWithOptions.
I recently noticed that I picture I had saved and then displayed at a later date was highly pixelated; when I went back with the same code and imported the photo again, I got a great image. After playing with this for a while on my device, I figured out that the quality of the image saved depends on WHEN I pressed the 'Choose' button on the 'Move and Scale' screen.
If the image is a larger image and still loading when I press the button, the image is pixelated... if I wait until the image loads, it is fine. My question is, is there any way I can control when the user presses the 'Choose' button - is there any way to force them to wait until after the image is fully loaded? Or is there another way that would be better to approach this issue?
- (void)choosePhoto {
//NSLog(#"%s", __FUNCTION__);
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.allowsEditing = YES;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:imagePicker animated:YES];
[imagePicker release];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
//NSLog(#"%s", __FUNCTION__);
[self dismissModalViewControllerAnimated:YES];
UIImage *pickedImage = (UIImage*)[info objectForKey:#"UIImagePickerControllerEditedImage"];
[self setPersonImage:pickedImage];
}
- (void) setPersonImage:(UIImage *)pickedImage {
//NSLog(#"%s", __FUNCTION__);
NSManagedObjectContext *context = [[UIApplication sharedDelegate] managedObjectContext];
PersonImage *oldImage = person.image;
if (oldImage != nil) {
[context deleteObject:(NSManagedObject*)oldImage];
}
if (pickedImage != nil) {
// Create an image object for the new image.
PersonImage *newImageObject = [NSEntityDescription insertNewObjectForEntityForName:#"PersonImage" inManagedObjectContext:context];
[newImageObject setImage:pickedImage];
[person setImage:newImageObject];
}
else {
[person setImage:nil];
}
NSError *error;
if (![context save:&error]) {
exit(-1); // Fail
}
}
I suggest you implement your own Crop&Resize view controller.
set imagePicker.allowsEditing = NO.
create your view controller in - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info and pass selected image to your view controller.
push your view controller to image picker: [picker pushViewController:yourVC animated:YES]
The image captured by the iPhone 4 camera is ~5 MB in size and it takes a while to display/render it. One option is to compress the image using UIImageJPEGRepresentation().
If you do not want to compress the image, you can use UIWebView to display the images. The UIWebViewDelegate has a method - (void)webViewDidFinishLoad:(UIWebView *)webView, that hits after the rendering has been completed. You can enable the choose button in this method (which is disabled initially).

Passing UIImage to second view controller lags transition

I'm using a UIImagePickerController to select an image from my photo album. Once I've selected the image, I'm passing the image through to a second view controller and displaying it in a UIImageView. See code below:
First view controller:
- (IBAction)selectPhoto
{
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentModalViewController:self.imagePicker animated:YES];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UploadViewController *uploadViewController = [[UploadViewController alloc] initWithNibName:#"UploadViewController" bundle:nil];
[uploadViewController setImage:[info objectForKey:#"UIImagePickerControllerOriginalImage"]];
[picker pushViewController:uploadViewController animated:YES];
}
Second view controller:
- (void)viewDidLoad
{
[super viewDidLoad];
// Set the image view image
imageView.image = self.image;
}
The code does the job, however, when I push from the image picker to my second view controller, it lags as it's transitioning.
Ideally I would like a smooth transition but I would be happy if it just waited half a second or something and then moves smoothly.
Can any explain why this could be happening and how/if I can get around it?
Thanks.
The delay is probably from rendering the image, you could try having your UploadViewController's initial view contain an activity spinner then actually set the image in the viewDidAppear method, this method should be called after the animation is completed.
Try with this , here timer is introduced in order to provide delay(0.5sec) ,
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[NSTimerscheduledTimerWithTimeInterval:0.5 target:self selector:#selector(timerAction:) userInfo:info repeats:NO];
}
-(void)timerAction:(NSTimer *)timer
{
UploadViewController *uploadViewController = [[UploadViewController alloc] initWithNibName:#"UploadViewController" bundle:nil];
[uploadViewController setImage:[[timer userInfo]objectForKey:#"UIImagePickerControllerOriginalImage"]];
[picker pushViewController:uploadViewController animated:YES];
[uploadViewController release];
}

using UIImagepickerController cameraoverlayview to take picture?

i am using UIImagepickerController to take pictures from camera..i am using my own view over the camera view by using the cameraoverlayview property...i want to take a picture from camera when user clicks on a button in my custom view...i am using the following code
- (void)viewDidLoad {
imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:imagePickerController animated:YES];
imagePickerController.showsCameraControls=NO;
imagePickerController.cameraOverlayView = self.customView;
}
- (IBAction) takePicture
{
[imagePickerController takePicture];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
imageView.image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
[picker dismissModalViewControllerAnimated:YES];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissModalViewControllerAnimated:YES];
}
but when i run this code it gives me error
ERROR: FigCreateCGImageFromJPEG returned -12905. Input (null) was 773625 bytes.
and i also get warnings for memory use level 2 and then level 1
and no image is displayed in the imageView.. can anyone help me what i might be doing wrong??
btw i am using iPhone 3G with iOS4.1 installed on it
UIImagePickerControllerOriginalImage is a symbol (an NSString * constant) and you can't assume its value. Use as is, without quotes. Other than that, if you properly retain and create both the picker and the image view, it should work.

Record Video/Take Picture switch in iPhone app?

So i got a iphone app that is a button and when you pressed it i want the camera view to pop up and i want to give the user a choice to take a picture or a video like in the default camera app the one switch thing.
Thanks!
What you are looking for is something called 'UIImagePickerController'
-(void) getPhoto:(id) sender {
UIImagePickerController * picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
if((UIButton *) sender == choosePhotoBtn) {
picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
} else {
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
}
[self presentModalViewController:picker animated:YES];
}
This method is the what would be called when you press your button(s), what i am doing here is I have two buttons, choosePhotoBtn, and takePhotoBtn, the both link to the same method.
If the button that was pressed (the sender) is choosePhotoBtn, then UIImagePickerControllerSourceTypeSavedPhotosAlbum is set as the UIImagePickerController's source type.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
bannerImage.image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissModalViewControllerAnimated:YES];
}
These two methods are delegate methods. They get called when the modelViewController holding the UIImagePickerController is dismissed.
I would recommend this site, as it has a brilliant tutorial on how to use these functions.
http://icodeblog.com/2009/07/28/getting-images-from-the-iphone-photo-library-or-camera-using-uiimagepickercontroller/
This is where i learnt how to use these classes, it seems like the site has had a wordpress comment attack on it at the moment, and firefox is blocking it for me, but if u can get to the page. Its a great resource.

UIImagePicker doesn't showing selected image

I'm new to iPhone and I'm using this code to select an image from the iPhone library and show it in imageView. The library is showing images, but when I'm selecting the image, it doesn't appear in the image view..
- (void)viewDidLoad {
[super viewDidLoad];
UIImagePickerController * picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
imageView.image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
}
Please can you tell me what's the problem with the code?
Try with:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
imageView.image = pickedImage;
[self dismissModalViewControllerAnimated:YES];
}
UIImagePickerControllerOriginalImage is a string constant that could be different from #"UIImagePickerControllerOriginalImage" string.
Then, it's safe and more clear to former set the image view, and latter to dismiss the modal view controller.
Pay attention that you should invoke dismissModalViewControllerAnimated: on self because you are dismissing the modal view controller "owned" by self.
Bye!
I fixed my issue of "grey box appearing instead of an image in UIImageView".
I forgot to make the Background color of the UIIMageView to be CLEAR COLOR. THe problem was solved by setting background color to clearColor.
Was using XIB and you should also check if anything is laid out wrong in Interface builder in case you are using interface builder to create UI.