I have an application that allows a user to add a picture to a log.
If the user chooses to add from library, everything is fine, but if a user chooses to take
a picture with the camera there's an issue:
When the camera modal view is animated in and I either take a picture and tap on "Use" or i click on the "Cancel" button, the view I'm in when calling dismissModalViewAnimated is removed from its superview.
Anyone got an explanation for this?
Here's the code I use for presenting the modal viewcontroller
pickerCont = [[UIImagePickerController alloc] init];
pickerCont.delegate = self;
pickerCont.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:pickerCont animated:YES];
And this is what i use to dismiss it:
[self dismissModalViewControllerAnimated:YES]
Actually you are dissmissing parentview. here self represents parentView
Use UIImagePickerController's delegate to dissmiss UIImagePickerController
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//get picked image here
[pickerCont dismissModalViewControllerAnimated:YES]
}
Related
I can't figure out the most effective and "elegant" method for doing some task. The problem definition is:
I want to display several views, one of them is the ImagePicker with camera roll source.
The hierarchy looks similar to this:
MAIN VIEW ---> PICKER ---> IMAGE PROCESSING VIEW
When the user tap "back button" UI has to allow backward displaying.
I have tried several options:
1.
a) MAIN VIEW presents picker view modally.
b) In didFinishPickingMediaWithInfo delegate method dismiss picker modal view and after that invoke presentModalViewController with IMAGE PROCESSING VIEW.
Sample code:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage* pickedImage = [info valueForKey:UIImagePickerControllerEditedImage];
LastViewController* vc = [[LastViewController alloc] init];
vc.mainImage = pickedImage;
[self dismissModalViewControllerAnimated:NO];
[self presentModalViewController:vc animated:NO];
}
Problem is that, it doesn't works, cause controller can't display next modal after dismissing another (previouse won't disappear immediately, MAIN isn't active immediately, and can't present the new one).
2.
MAIN VIEW presents IMAGE PROCESSING VIEW modally, but immediately after that IMAGE PROCESSING VIEW is presenting picker view modally, waiting for done, dismissing picker and user can see IMAGE PROCESSING VIEW with image from library.
Sample code:
in some action of main view controller:
ImageProcessViewController *vc = [[ImageProcessViewController alloc] initWithNibName:#"ImageProcessViewController" bundle:nil];
vc.delegate = self;
vc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:vc animated:NO];
[vc release];
in ImageProcessViewController:
- (void)viewDidLoad {
[super viewDidLoad];
//some UI init here
if(self.sourceType == UIImagePickerControllerSourceTypePhotoLibrary) {
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
ipc.delegate = self;
ipc.allowsEditing = YES;
[self presentModalViewController:ipc animated:NO];
[ipc release];
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage* pickedImage = [info valueForKey:UIImagePickerControllerEditedImage];
self.mainImage = pickedImage;
[self dismissModalViewControllerAnimated:NO];
}
Problem is that, i can't call presentModalViewController in viewDidLoad method because it won't work (it is too early in view controller live cycle I guess). I tried also in viewDidAppear, but in that case I have to set some ivar flag, to display picker view only once and empty IMAGE PROCESSING VIEW is displayed for short time before image picker view and i don't want this.
3.
I tried to figure out how to use Navigation Controller to do this, beacause UIImagePickerController is using his nav controller, but this is private structure and documentation says programmers can't do that.
Please give me some suggestions because I really lost my way at the moment
In your main view controller, use viewDidAppear:animated: - this will be called when the modal transition has finished. You can safely start another modal transition from there.
I am new to Iphone development. I am working on an application which involves two views. I have a camera button in view one which opens up the default Iphone camera. This is achieved by having this code in the IBAction for camera button in ViewOneController:
UIImagePickerController *picker =
[[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = NO;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
[picker release];
The view controller for the first view is also the UIImagePickerControllerDelegate for the camera. When the picture is clicked and the camera view returns to the function imagePickerController:didFinishPickingWithMediaInfo where I do this:
(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
[self presentModalViewController:ViewTwoViewController animated:YES];
}
So basically all I am trying to achieve is from viewone click "take picture" ---> Open camera --> after camera is done jump to view two. Quite simmilar to what it is in the flickr app. However after I take the picture from camera my app returns to view one and view two is not shown. What am I missing here?
Also from a conceptual perspective I guess IOS keeps a stack of views for any app. When presentModalViewController is called the view is shown and it is added to the stack and when dismissModalViewController is called the view is removed from the stack and the parent view is show. Is that right?
Thanks.
You probably need to put the call to [self presentModalViewController:ViewTwoViewController animated:YES] in viewWillAppear which will be called after the picker view has been removed.
You probably also need to surround the call with some check to only present viewTwo when applicable.
I've got an imagePickerController which allows the user to take or select an image.
In - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info; I would like to trigger opening another modal view to capture the caption. I have a call for that purpose...
-(void) getcaption:(id) obj {
textInput * ti = [[textInput alloc] initWithContent:#"" header:#"Caption for photo" source:2];
ti.delegate = self;
[self presentModalViewController:ti animated:YES];
[ti release];
}
The question is how to call getcaption without triggering a spiral of
#6663 0x324abb18 in -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] ()
At the moment I do
[self performSelector:#selector(getcaption:) withObject:nil afterDelay:(NSTimeInterval)1];
in didFinishPickingMediaWithInfo
which is nasty, and only 95% reliable
I assume the problem is that you are attempting to show your new view before your old view has closed? I assume you are in a parent view controller that is displaying both modal views with it being the parent. If that is the case, the point at which you should display the new modal view is when the parent view has completely finished hiding the previous modal view. Specifically, this happens at
- (void) viewDidAppear:(BOOL)animated
You'll want to make sure that you only show the second modal view after the previous one has finished, of course (that is, don't show it when the parent view is appearing for any other reason)
I create the picker:
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
imagePicker.allowsEditing = NO;
[self presentModalViewController:imagePicker animated:YES];
and I handle the didFinishPickingMediaWithInfo:
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[picker dismissModalViewControllerAnimated:YES];
[picker release];}
but this calls the viewDidLoad on self. This is not normal is it? Whats wrong?
Your app probably received a memory warning, which caused all view controllers who are not displayed on screen to unload their views. This is quite normal while you are in the image picker because the camera needs a lot of memory. The moment you dismiss the image picker your view controller reloads its view.
As this is perfectly normal behavior, your app must deal with this situation correctly.
I had a similar issue with this, I was displaying a popup during a long press gesture. It appeared as though the modal was not dismissed after the image was selected. However, the long press gesture event gets called several times, so a new popup was being displayed for every event. In my gesture handler I do something like this as to fix:
if (![imagePickerPopoverController isPopoverVisible]){
//show pop-up etc
}
I had some kind of that issue and I'd tried to set presentation "Over full screen" and it worked without reloading
How can I create an application that would initiate a camera and update the image view with the image picked by the camera?
Try this out.
In the viewDidLoad method, initialize the UIImagePickerController, assign its property sourceType as UIImagePickerControllerSourceTypeCamera and delegate as self.
Define a button in your view controller where on its click event get the modal view of the imagepicker, like:
[self presentModalViewController:self.picker animated:YES];
here picker is the object of UIImagePickerController.
Next,implement the didFinishPickingMediaWithInfo delegate of UIImagePickerController. In this delegate, you can assign a UIImage to the Dictionary object info, then save the image to your local instance of UIImageView(its ImageToSave below)
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
[[picker parentViewController] dismissModalViewControllerAnimated:YES];
UIImage *img = [info objectForKey:#"UIImagePickerControllerImage"];
ImageToSave.image = img;
}
Do not forget to include the UIImagePickerControllerDelegate into your main view controller's .h file.
See if this works or not.
If you think about it, self.view = picker.cameraOverlayView just copies an empty transparent view over you own!! It doesn't even add it to the screen, not that it would work...
Instead, you need to present the picker controller:
[self.navigationController presentModalViewController:picker animated:YES];
Then make sure to implement the delegate calls (which it looks like you may have since you already set the delegate)