My problem;
Hide the default camera controls and overlay it with my my own. This is made with the property cameraOverlayView. I also was having problem triggering the takePicture method.
(Question solved in the comments and in the edits. See Question with no answers, but issue solved in the comments (or extended in chat) )
The OP wrote:
Here is what came to be the solution:
I have two UIViewController. The main ViewController and the CustomOverlay (for the camera controls).
I the ViewController I declare the source type and the overlay for may camera control like this:
- (void)viewDidLoad
{
// notification from the CustomOverlay Controller that triggers the eTakePicture method
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(eTakePicture:) name:#"eTakePicture" object:nil];
daysBtn.delegate = self;
daysBtn.hidden = YES;
picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
picker.showsCameraControls = NO;
picker.navigationBarHidden = YES;
picker.wantsFullScreenLayout = YES;
picker.delegate = self;
overlay = [[CustomOverlay alloc] initWithNibName:#"CustomOverlay" bundle:nil];
// Overlay for the camera controls, note the "= overlay.view", the ".view" was important
// because the overlay is a new UIViewcontroller (with xib) so you have to call the
// view. Most tutorials that I saw were based on UIView so only "= overlay" worked.
picker.cameraOverlayView = overlay.view;
[self presentModalViewController:picker animated:NO];
[super viewDidLoad];
}
Now on the CustomOverlay, which is a UIViewController I have the take picture button and want this button to trigger a method in the main ViewController:
- (IBAction)shoot:(id)control {
[[NSNotificationCenter defaultCenter] postNotificationName:#"eTakePicture" object:self];
}
And back to the main ViewController:
-(void)eTakePicture:(NSNotification *)notification
{
[picker takePicture];
}
All the code above will change a little more once I review it, specially the first block where I have to have a condition to check if cameraSourceType is available.
Hope that helps somebody out there. Any question, just ask.
Related
I'm developing an Augmented Reality application, everything worked properly till now that I need two different kind of visualization (AR and Map) depending on the device orientation. In particular the application should use the landscapeViewController when the device is in landscape mode while it should use another controller (named faceUpViewController ) when the device's orientation is "face up". I tried doing it with two simple view controllers and it works fine. The problem happens when the landscapeViewController uses the AR controller. The view is completely white and I don't understand why. Both the two controllers are "contained" by a Root View Controller. I'm doing everything by coding so without nib files. Here is the code:
RootViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(deviceOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}
- (void)deviceOrientationDidChange:(NSNotification *)notification{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationLandscapeLeft) {
if (self.landscapeViewController.view.superview == nil) {
if (self.landscapeViewController == nil) {
LandscapeViewController *lvc = [[LandscapeViewController alloc] init];
self.landscapeViewController = lvc;
[lvc release];
}
[self.faceUpViewController.view removeFromSuperview];
[self.view addSubview:self.landscapeViewController.view];
}
}
if (orientation == UIDeviceOrientationFaceUp) {
if (self.faceUpViewController.view.superview == nil) {
if (self.faceUpViewController == nil) {
FaceUpViewController *fvc = [[FaceUpViewController alloc] init];
self.faceUpViewController = fvc;
[fvc release];
}
[self.landscapeViewController.view removeFromSuperview];
[self.view addSubview:self.faceUpViewController.view];
}
}
}
#end
LandscapeViewController.m
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
UIView *landscapeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
landscapeView.backgroundColor = [UIColor yellowColor];
self.view = landscapeView;
[landscapeView release];
ARController *arC = [[ARController alloc] initWithViewController:self];
arC.landscapeViewController = self;
self.arController = arC;
[arC release];
}
//When the view appear present the camera feed
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[_arController presentModalARControllerAnimated:NO];
}
FaceUpViewController.m
- (void)loadView
{
UIView *faceUpView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
faceUpView.backgroundColor = [UIColor blueColor];
self.view = faceUpView;
[faceUpView release];
}
ARController.m Very simple version
- (id) initWithViewController:(UIViewController *)theView{
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
self.rootController = theView;
//Retrieve screen bounds
CGRect screenBounds = [[UIScreen mainScreen] bounds];
UIView *overlaidView = [[UIView alloc] initWithFrame: screenBounds];
self.overlayView = overlaidView;
[overlaidView release];
self.rootController.view = overlayView;
// Initialise the UIImagePickerController
UIImagePickerController *picker= [[UIImagePickerController alloc] init];
self.pickerController = picker;
[picker release];
self.pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
self.pickerController.cameraViewTransform = CGAffineTransformScale(
self.pickerController.cameraViewTransform, 1.0f, 1.12412f);
self.pickerController.showsCameraControls = NO;
self.pickerController.navigationBarHidden = YES;
self.pickerController.cameraOverlayView = _overlayView;
}
return self;
}
- (void)presentModalARControllerAnimated:(BOOL)animated{
[self.rootController presentModalViewController:[self pickerController] animated:animated];
self.overlayView.frame = self.pickerController.view.bounds;
}
#end
I say again that I'm doing everything by coding thereby without nib files.
I really appreciate any advice!
Thanks
The primary problem with adding and removing your "child" view controllers' views as you've done here is that the view controller life cycle methods (viewWillAppear:, viewDidAppear:, etc.) won't ever get called on your child view controllers. Containers like UINavigationController and UITabBarController have always known how to delegate methods like these appropriately to their children, but UIViewController didn't officially support the ability to nest view controllers under your own custom container before iOS 5. It was possible, but it took a lot more work to do it right.
If you want to stick with the approach of adding and removing subviews, you have two options:
Require iOS 5+, and call addChildViewController:, removeFromParentViewController,
transitionFromViewController:toViewController:duration:options:animations:completion:,
willMoveToParentViewController:, and
didMoveToParentViewController: as described in the Implementing a Container View Controller section of the UIViewController Class Reference.
To support older iOS versions, you'll have to override many of the methods of the UIViewController class and delegate those calls manually to your child view controllers to make them behave as expected. I'd pay particular attention to the sections titled, "Responding to View Events", and "Responding to View Rotation Events" in the UIViewController Class Reference.
A different approach for pre-iOS 5 support is to present your child view controllers using presentModalViewController:animated: rather than adding their views as subviews to a container. Apple describes this approach in the View Controller Programming Guide for iOS under the section, Creating an Alternate Landscape Interface. The advantage of this approach is that your child view controllers are officially supported as first-class members of the view controller hierarchy, so UIKit will automatically manage their life cycles appropriately. You won't have to override and delegate all those methods manually.
You might want to try getting your acceptance rate up a little bit - more people would be willing to help you.
Anyway, wild guess: in your root controller, try putting the contents of
deviceOrientationDidChange
into
deviceOrientationWillChange.
I am trying to create a sort of 'settings' page, and I am having a hard time switching the background image of my original view. The code, so far, is:
-(IBAction)switchBackground:(id)sender {
ViewController *mainView = [[ViewController alloc] initWithNibName:nil bundle:nil];
mainView.displayedImage.image = [UIImage imageNamed:#"image.png"];;
}
Perhaps I can get some pointers?
Thanks, all.
You are creating a new mainView object each time you call switchBackground method. You must change the background of an existing object to see the change happen.
From your code it is hard to say where switchBackground method is located. ViewController?
If it is located in the view controller then all you have to do is:
self.displayedImage.image = [UIImage imageNamed:#"image.png"];
EDIT
As per your comment.
When you want to change the image of an object of class A from class B you can do it in two different ways:
1. Through reference to an object
this is the settings initializer which on creation gets the pointer to your existing mainView
#property(nonatomic,assign)ViewController *mainView;
- (id)initWithMainViewController:(ViewController*)vc {
self = [super init];
if (self) {
self.mainView = vc;
}
return self;
}
-(IBAction)switchBackground:(id)sender {
mainView.displayedImage.image = [UIImage imageNamed:#"image.png"];
}
2. By posting local notification through NSNotificationCenter.
-(IBAction)switchBackground:(id)sender {
[[NSNotificationCenter defaultCenter] postNotificationName: #"changeImage" object: [UIImage imageNamed:#"image.png"]];
}
Now in your ViewController listen to the notification and react
in the init method in ViewController
- (id)initWithMainViewController:(ViewController*)vc {
self = [super init];
if (self) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(changeImage:) name:#"changeImage" object:nil];
}
return self;
}
-(void)changeImage:(NSNotification*)notification{
self.displayedImage.image = (UIImage*) notification.object;
}
I know there have been a couple questions asked similar to this, but I think my issues is a little different, so bear with me.
I have a tabbed view app with table views set in 2 of the 3 tabs. I want to be able to refresh just the table view of the selected tab when the app wakes back up. I have tried using the notification center to tell my tab to refresh, but it makes the other tab crash because it is stealing the view from my progress hud. I will put some code here, so hopefully I can find a solution that will work for me.
Tab 1 ViewController
- (void)viewDidLoad {
// becomeActive just calls viewDidAppear:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(becomeActive:)
name:UIApplicationDidBecomeActiveNotification
object:nil];
[super viewDidLoad];
}
-(void)viewDidAppear:(BOOL)animated {
HUD = [[MBProgressHUD alloc] initWithView:self.view];
[self.view addSubview:HUD];
HUD.delegate = self;
HUD.labelText = #"Updating";
HUD.detailsLabelText = #"Please Wait";
[HUD showWhileExecuting:#selector(refreshData) onTarget:self withObject:nil animated:YES];
}
Tab 2 ViewController
- (void)viewDidLoad
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
self.navigationItem.title = [defaults valueForKey:#"companyName"];
self.view.backgroundColor = background;
tableView.backgroundColor = [UIColor clearColor];
tableView.opaque = YES;
tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
// becomeActive just calls viewDidAppear
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(becomeActive:)
name:UIApplicationDidBecomeActiveNotification
object:nil];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
if (_refreshHeaderView == nil) {
EGORefreshTableHeaderView *view = [[EGORefreshTableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f - self.tableView.bounds.size.height, self.view.frame.size.width, self.tableView.bounds.size.height)];
view.delegate = self;
[self.tableView addSubview:view];
_refreshHeaderView = view;
[view release];
}
// update the last update date
[_refreshHeaderView refreshLastUpdatedDate];
}
-(void)viewDidAppear:(BOOL)animated {
HUD = [[MBProgressHUD alloc] initWithView:self.view];
[self.view addSubview:HUD];
HUD.delegate = self;
HUD.labelText = #"Updating";
HUD.detailsLabelText = #"Please Wait";
[HUD showWhileExecuting:#selector(updateBoard) onTarget:self withObject:nil animated:YES];
// update the last update date
[_refreshHeaderView refreshLastUpdatedDate];
}
With this setup, my application will refresh tab 2 just fine, assuming that tab 2 was the last tab open before you closed the application. If I switch to tab 1 when I close, upon restarting the app, the notification calls tab 2 first and steals the view out from under my progress hud, so when I try to call the viewDidAppear method, the view is null and the app crashes. I either need to figure out how to implement the notification center better so it doesn't crash the other tab, or a better way overall to just refresh when the app becomes active. Looking forward to a good answer. Thanks in advance.
EDIT
When I run with this setup, it aborts inside the MBProgressHUD
- (id)initWithView:(UIView *)view {
// Let's check if the view is nil (this is a common error when using the windw initializer above)
if (!view) {
[NSException raise:#"MBProgressHUDViewIsNillException"
format:#"The view used in the MBProgressHUD initializer is nil."]; // <-- Aborts on this line, so they know it can happen
}
id me = [self initWithFrame:view.bounds];
// We need to take care of rotation ourselfs if we're adding the HUD to a window
if ([view isKindOfClass:[UIWindow class]]) {
[self setTransformForCurrentOrientation:NO];
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(deviceOrientationDidChange:)
name:UIDeviceOrientationDidChangeNotification object:nil];
return me;
}
Main problem here that notifications are received by all views, whether they will appear or not. Good practice would be to notify only those views which will appear in screen
you can use application delegate's (void)applicationWillEnterForeground:(UIApplication *)application method to handle change in application instead of notification.
if problem is all about refreshing tab that is on screen then keeping track of change in tab in AppDelegate and using that when application enters foreground would be better idea over notification.
Other option is to use viewWillAppear method in tabbarcontroller. When this method gets called, you can refresh current tab.
There really isn't much out there to help answer this question. #Learner gave me an idea that ultimately led to how I resolved this issue.
Since all of the logic I have works, the issue was to prevent the HUD from stealing the view from the other one since they both get called when they respond to the notification event. So in my -becomeActive event for both tabs, I added a check if the selectedIndex was a match for the current tab, if not, no refresh. Worked like a charm.
-(void)becomeActive:(NSNotification *)notification {
// only respond if the selected tab is our current tab
if (self.tabBarController.selectedIndex == 1) { // just set the number to your tab index
[self viewDidAppear:YES];
}
}
I just trying to get to QLPreviewController.view. Indeed, I want to catch a tap event on its view to show/hide toolbar etc. I am trying:
QLPreviewController* qlpc = [QLPreviewController new];
qlpc.delegate = self;
qlpc.dataSource = self;
qlpc.currentPreviewItemIndex=qlIndex;
[navigator pushViewController:qlpc animated:YES];
qlpc.title = [path lastPathComponent];
[qlpc setToolbarItems:[NSArray arrayWithObjects:self.dirBrowserButton,self.space, self.editButton, self.btnSend, nil] animated:YES];
UITapGestureRecognizer* gestTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(showControls:)];
gestTap.cancelsTouchesInView=NO;
[qlpc.view addGestureRecognizer:[gestTap autorelease]];
[qlpc release];
And nothing happens
If I attach UITapRecognizer onto navigationController.view, it fires only if I touch toolbar/navbar. UISwipeGestureRecognizer works fine in that case.
I tried to attach a transparent overlay view and add gesture recognizers on it, but no luck.
Well, I saw some apps that implements such a feature so obviously it is possible, but how?
Sorry, I googled all day long and didn't find any solution. Please, help me.
With your solution, does the QLPreviewController's view still recieve touches? I've tried to do something similar (I'm stealing the view from QLPreviewController to use it) and it looks like my overlay view doesn't let anything pass trough to the view lying behind it.
I have been working on this problem today and the suggestion to override -(void)contentWasTappedInPreviewContentController:(id)item {} is close but when you do you mess with the preview controllers handling.
So I stopped overriding that method and instead created a RAC signal that fires whenever the method is called. This does not mess with the default behavior of QL. I am doing it in a subclass of the QLPreviewController but that shouldn't be necessary.
I have a property on my class:
#property RACSignal *contentTapped;
Then in my init method of my subclass of QLPreviewController:
_contentTapped = [self rac_signalForSelector:#selector(contentWasTappedInPreviewContentController:)];
Now in another class or even internally you can use the signal like this:
previewController.contentTapped subscribeNext:^(id x) {
// Put your handler here!
}];
Here is my solution (to use KVO), where I'm monitoring navigation bar status - and showing toolbar when needed (it seems that it hides toolbar by itself when tapped)
#define kNavigationBarKeyPath #"navigationBar.hidden"
static void * const NavigationBarKVOContext = (void*)&NavigationBarKVOContext;
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setToolbarHidden:NO];
[self.navigationController addObserver:self forKeyPath:kNavigationBarKeyPath options:NSKeyValueObservingOptionPrior context:NavigationBarKVOContext];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController removeObserver:self forKeyPath:kNavigationBarKeyPath];
}
And
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ( context == NavigationBarKVOContext ) {
BOOL prior = [change[NSKeyValueChangeNotificationIsPriorKey] boolValue];
if ( prior && self.navigationController.toolbarHidden ) {
dispatch_async(dispatch_get_main_queue(), ^{
[self.navigationController setToolbarHidden:NO animated:YES];
});
}
}
}
I found none of the answers here to work, but the one that did for me was to subclass QLPreviewController and override viewDidAppear as so:
- (void)viewDidAppear:(BOOL)animated
{
UITapGestureRecognizer *gestTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(showControls:)];
gestTap.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:[gestTap autorelease]];
}
Ok, solution is very simple.
just added an overlay view onto keyWindow. Attached gesture recognizers onto overlay and it works.
QLPreviewController* qlpc = [QLPreviewController new];
qlpc.delegate = self;
qlpc.dataSource = self;
qlpc.currentPreviewItemIndex=qlIndex;
[navigator pushViewController:qlpc animated:YES];
qlpc.title = [path lastPathComponent];
UIView* overlay = [[[UIView alloc] initWithFrame:navigator.view.bounds] autorelease];
[[[UIApplication sharedApplication] keyWindow] addSubview:overlay];
[overlay setNeedsDisplay];
[qlpc setToolbarItems:[NSArray arrayWithObjects:self.dirBrowserButton,self.space, self.editButton, self.btnSend, nil] animated:YES];
UITapGestureRecognizer* gestTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(showControls:)];
gestTap.cancelsTouchesInView=NO;
[overlay addGestureRecognizer:[gestTap autorelease]];
[qlpc release];
Subclass QLPreviewController and then override
-(void)contentWasTappedInPreviewContentController:(id)item
{}
Thats its !
I want to make a game, where the user can touch a picture of a TV and then choose a picture from their photo library.
I had success working with UITextFields, adding them to my EAGLView as subviews But I haven't been able to do the same thing with an UIImagePickerController , which seems the only way to do what I want to do.
Any help is appreciated !
UPDATE
With the suggestion of zpasternack I managed to make the menu appear by adding the UIImagePickerControllerDelegate, UINavigationControllerDelegate and using this method:
- (void) chooseImageFromLibrary {
if( ![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] ) return;
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePickerController.allowsEditing = YES;
[self addSubview:imagePickerController.view];
[imagePickerController viewWillAppear:YES];
[imagePickerController viewDidAppear:YES];
}
I call the chooseImageFromLibrary method at the start. It shows the interface, but as soon as i hit cancel or choose the app stops.
Can anyone suggest me:
1) How to make the cancel and choose buttons work.
2) How to call the UIImagePickerController whenever I want ( by calling chooseImageFromLibrary again ??).
3) When the user hits choose..Where do i find the UIImage the user just picked to ?, how do i pick it ?
Thanks.
I've never used one over an EAGLView, but UIImagePickerControllers are typically invoked with presentModalViewController, like:
- (void) chooseImageFromLibrary {
if( ![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] ) return;
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePickerController.allowsEditing = YES;
[self presentModalViewController:imagePickerController animated:YES];
}
Nervermind, problem solved. i just needed to overwrite some functions to make use of the UIImagePickerController.