I have a map annotation view that contains a rightcallout button which loads an accessory view which is a UIViewController class. I am using resuable annotations, but am wondering how I can pass updated information to my UIViewController class. Let's say I have 2 string values which map to 2 UILabels on my view. How can I update those values after the initial accessory view has already been loaded into memory as a resusable view?
Any help would be appreciated.
You'll need to maintain a reference to the UILabels in the object that gets the update, and then use setTitle: (I think) to update the labels.
In your annotation subclass you need to override the setTitle method to send the changes to the instance of your UIViewController class that your subclass is holding. Or, you could setup your annotation subclass to receive notifications (from NSNotificationCenter), and upon receiving a notification, update the title and the instance of your UIViewController class.
If you are unfamiliar with NSNotifications, then here is a quick reference. I used these to keep my annotations updated.
NSNotification Example
Try using the MKMapViewDelegate method:
-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;
This method is called when a user tapped one of the annotation view’s accessory buttons. Assuming that your MKMapViewDelegate is also the UIViewController that can access your accessory view.
Related
In my storyboard I have a UICollectionView, with cells, sections, etc. I set as delegate and datasource a custom class (so, not the classic myCollectionView.delegate = self) but a custom class that cares about the retrieving of datas.
In this UICollectionView I have a label that I need to update with a certain value that I handle in the delegate class. (It's a property of the selected cell).
How can this be done? I read about KVO and Notification, but i'm not sure what I have to do.
More Detail
MatchCollectionViewController
In this one:
viewDidLoad
A gameView that act as a container for the following collectionView
CollectionView declaration (once created the collectionView i add it to the gameView)
The delegate of the CollectionView is the following class CollectionViewUiGrid
CollectionViewUiGrid
In this class i implement all the delegate and dataSource methods for the collectionView
initWithFrame (and initWithFrame with my own parameters)
in the method cellForItemAtIndexPath i return an istance of a class (UiGameCell) that extends UiCollectionViewCell
In the method didSelectItemAtIndexPath i have this logic.
If a cell is selected, assign retrieve his property, called CellDescription).
This is the property that i would like to be as my UiLabel value in MatchCollectionViewController.
I found a solution.
As mentioned in
Pass object with NSNotificationCenter to other view
Probably one of the simplest way is to use a NsNotificationCenter.
Is it possible to embed (add as subview) a UITableViewController into another View Controller programmatically? I found a few answers here on StackOverflow but none worked for me with ARC and iOS6 SDK.
I know you can do this easily with Navigation and TabBar controllers but I am more curious about adding tableviews to a regular View controller. I need my tableview to occupy the lower part of the available screen space (I need the rest for other purposes, for which neither tab nor navigation types are suitable).
When I tried to do it, however, it did not work. I instantiated a subclassed UITableViewController, but when I added it to my self.view as a subview, the compiler said I tried to use "incompatible pointer types." Not only that, my instantiated UITableViewController does not have a .frame property, so I cannot set it dimensions, which would be the whole point of this exercise.
Building upon ogres answer, you should add the tableViewController's view as a subview, but it is not everything. The tableViewController is a viewController and it needs to know its parent and its children, to do its viewController-job correctly. I do not know any details here, but there is an entire talk about this from WWDC 2011 called "Implementing UIViewController Containment".
One problem I have experienced when only adding the view as a subview is that target actions don't seem to work. Tapping a UIButton or similar causes either a EXC_BAD_ACCESS or a unrecognized selector sent to instance.
So I recommend that you do something like this:
UIViewController *vc = //Your tableViewController
[self addChildViewController:vc]; //Important
[self.view addSubview:vc.view];
//If you want to set the frame, set the frame of the tableViewController's view
vc.view.frame = ...
yes , you can use tableview in another view without any problems
UITableViewController, but when I added it to my self.view as a subview
are you trying to add viewcontroller as subview or its view ? ( viewcontroller.view )
UITableViewController does not have a .frame property,
of course it does not have .frame property , it is a view CONTROLLER , you should see .view.frame
I have a app out for testing right now that's almost completely done - just a few bug fixes left. Unfortunately, the customer decided that they'd like the entire main page of the app to be inside of a scroll view (so that there's more room for the table at the bottom). I already have everything set up and I don't really want to move everything and change references. Is there an easy way to change the class of the main view to a scroll view? I've already tried changing the class in IB and setting the class type in the init method. If there isn't I'll probably just throw the top section of the view into a nib file and load it as a custom cell.
-EDIT- I ended up changing the class type in IB and then doing
[(UIScrollView *) self.view setScrollEnabled:YES];
[(UIScrollView *) self.view setContentSize:CGSizeMake(0,2000)];
in viewDidLoad. Thanks for the help, wish I could accept all your answers.
When you are referring to [self view], I am going to assume you mean in a view controller. The view of a view controller can be any view that derives from UIView. Thus a scrollview is completely acceptable.
I don't really want to move everything and change references.
what would you have to move? why would you have to change references? Only thing you should need to do is add a scroll view to your view controller, set the view controllers view to it, and add the current view as a subview to the new scroll view. No references need to be changed, nothing has to be moved.
Refer to loadView method in documentation of view controller.
Here is a simple (untested!) example
- (void)loadView {
UIScrollView *scrollView = [[UIScrollView alloc] init] autorelease];
//Set the properties of scrollview appropriately....
self.view = scrollView;
}
Now the root view of your view controller will be a scroll view.
Note
- As the documentation states, do not do this if you are using interface builder to initialize your views/view controller. I could not tell from your description if this was the case or not. If it is, you should be able to change the view type in interface builder.
You need to set the contentSize property of your scrollview.
Since you are using IB, the easiest way to do this is to put all your UI elements into a view and add this single view to your scroll view. In the viewDidLoad method, set the content size of the scrollview to be the same size as the view that contains all your UI.
As an aside, there are much easier ways to reference views than walking down the view hierarchy, as you seem to be doing. viewcontroller.view.something.tableview. Add a connection to the tableview from your view controller in IB and it doesn't matter where that tableview is in the view hierarchy. You'll always be able to reach it from viewcontroller.tableview, no matter how you rearrange your nibs.
I think you have to use a pointer with proper type. Example for Google Maps: let's say you changed you base view's class to GMSMapView.
MapViewController.h
#property GMSMapView *mapView;
MapViewController.m
-(void)awakeFromNib{
[super awakeFromNib];
self.mapView = (GMSMapView*)self.view;
// ... etc.
}
I'm new to iPhone development. I've been reading several questions on how to make a google maps annotation callout window accept line breaks. Every tutorial I've read requires me to fire the mapView:didSelectAnnotationView method. But I have no idea how to trigger this. things I've tried include
putting the method in my MapViewController.m file which extends UIViewController
putting the method in a MapView.m file which extends MKMapView, then have my Mapview element in my storyboard reference it as the class to use
There's so much about xcode, objective c, and iphone development that I don't understand, so i can't tell where my problem lies.
At the moment, my map does plot my desired marker on the desired location. I just need to understand how to fire the mapView:didSelectAnnotationView and mapView:viewForAnnotation functions before I can start customizing the call out box.
Does anyone have step by step instructions on how to trigger these functions?
A bit of background
A few things to note:
You don't call mapView:didSelectAnnotationView. The MKMapView calls that function on it's delegate. In other words, when you set up an MKMapView, you tell it: "hey, listen, anytimme you need to tell me what's happening on the map, go tell this guy, he'll handle them for you". That "guy" is the delegate object, and it needs to implement mapView:didSelectAnnotationView (that's also why its name "did select", ie, it already happened, as opposed to "select"). For a simple case, the delegate is often the UIViewController that owns the MKMapView, which is what I'll describe below.
That method will then get triggered when the user taps on one of your annotations. So that's a great spot to start customizing what should happen when they tap on an annotation view (updating a selection, for instance).
It's not, however, what you want if you want to customize what annotation to show, which is what it sounds like you're actually after. For that, there's a different method just a few paragraphs earlier on the same man page: mapView:viewForAnnotation. So substitute this method if you find that mapView:didSelectAnnotationView isn't what you were looking for.
What you can do
If you got as far as a map with a marker, I'm guessing you have at least:
* a view controller (extendeding from UIViewController, and
* an MKMapView that you've added to the view for that view controller, say named mapView
The method you want to fire is defined as part of the MKMapViewDelegate protocol.
The easiest way to get this wired is to:
make your UIViewController the delegate for you MKMapView
in code, say in your viewDidLoad, of your MapViewController.m you could do mapview.delegate = self, OR
in Interface Builder, you could drag the connection from the the MKMapView delegate property to the file's owner
then, define a method on your UIViewController called mapView:didSelectAnnotationView, declaring it just like the protocol does, in your MapViewController.m file:
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
// whatever you need to do to your annotation and/or map
}
Good luck!
mapView:didSelectAnnotationView is a delegate method of the map view, you can read about it here:
MKMapViewDelegate Protocol Reference
You don't need to call it, the map view will call it "by it self" and send it to every view/view controller that registered as it's delegate.
What do you need to do
Basically you need to add the MKMapViewDelegate on your .h file, what will look something like this:
#interface someViewController : UIViewController <MKMapViewDelegate>
Then in the .m file, after you instantiate the map view you should add:
mapView.delegate = self;//were self refers to your controller
From this point and on your controller will be able to "receive messages" from the map view which are the methods that you can see on the MKMapViewDelegate reference I linked to.
So to implement the mapView:didSelectAnnotationView you need to add in your .m file
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
//if you did all the steps this methosd will be called when a user taps the annotation on the map.
}
What is happening
What happens in the background is:
The map view has a method (Apple codded) that handles the AnnotationView touch events.
When a touch event take place it sends a "message" to all of it's delegates saying "Hey a user did Select Annotation View on this map, Do with it what ever you need".
usually it looks like that:
[self.delegate mapView:someMapView didSelectAnnotationView:someAnnotationView];
Then every view/controller that assigned itself as a delegate and implemented the method will cal this method.
Good luck
Place *place = [[Place alloc] init];
PlaceMark *placeMark = [[PlaceMark alloc] initWithPlace:place];
[self.mapView selectAnnotation:placeMark animated:YES];
How do I go about drawing my own custom selection style for a view based NSTableView? I tried putting a BOOL var in my NSTableCellView subclass and set that to YES if it is clicked and then I can successfully draw my custom selection. But how do I change that BOOL var to NO when another view is clicked? Thanks for any help.
EDIT: After reading through the NSTableView docs, it looks like I need to subclass NSTableRowView to override the selection drawing, but what do I do with my NSTableRowView subclass? How do I get the table to use it?
Alright, I figured it out. You just have to subclass NSTableRowView. It has methods for drawing the background for selected and deselected rows. To get the table view to use your subclass just implement the table view delegate method tableView:rowViewForRow: and return an instance of your subclass.
To make things clear, I think we should give the code of the delegate method :
- (NSTableRowView *)tableView:(NSTableView *)tableView rowViewForRow:(NSInteger)row
{
MyNSTableRowView *rowView = [[MyNSTableRowView alloc]init];
return rowView;
}