I have a UIViewController class MyClass that initially had no XIB, and was initialized programmatically. Now, I don't want to load it from an XIB, but I do want to make a small 50x50 UIView (settings overlay view), and I want to add it MyClass, so instead of programatically declaring the new settings overlay view, I thought I would create an XIB file, set the file's owner to MyClass, declare in MyClass.h an IBOutlet UIView *settingsOverlay, and link it in the XIB.
Then in the viewDidLoad method, I do [self.view addSubview:settingsOverlay], but for some annoying reason it doesn't work. It just doesn't appear. I tried creating a simple UIImageView programmatically and adding it to the subView, and it works just fine, but when done through the XIB, it doesn't work. Can anyone point out what could possible be wrong? Please let me know what other details I might need to include.
If you are trying to add a view using xib then you need to use loadNibNamed method.
[[NSBundle mainBundle] loadNibNamed:#"settingsOverlay" owner:self options:nil];
You can refer developer link for more info - http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/NSBundle_UIKitAdditions/Introduction/Introduction.html
Creating an XIB for the settings overlay view and setting it's owner to MyClass does not implicitly cause that XIB to be loaded as a result of manually instantiating MyClass. You would have to manually load the settings overlay view XIB in MyClass viewDidLoad and add it as a subview. Loading it and passing owner as self will cause it to be bound to the IBOutlet you created, but you still have to add it as a subview.
The code in viewDidLoad would look like this:
[[NSBundle mainBundle] loadNibNamed:#"OverlayView" owner:self];
[self.view addSubview:self.overlayView];
You need to load the MyClass xib before settingsOverlay will be set. Try adding this line before your addSubview call.
[[NSBundle mainBundle] loadNibNamed:#"MyClass" owner:self options:nil];
Related
So I have a XIB file, which contains a view. In that view, I want to add custom objects and then being able to get those objects, and use them in a view controller I have where I crate other things programmatically.
My XIB file is called "MyXibLibrary.xib"
My view controller where I want the objects to be added to is called "ContactDetailsViewController"
My view controller is being pushed from a UITableViewController like this:
ContactDetailsViewController *detailViewController = [[ContactDetailsViewController alloc] init];
And inside my ContactDetailsViewController viewWillAppear I have this code to get the XIB objects:
UIView *xibView = [[[NSBundle mainBundle] loadNibNamed:#"MyLib" owner:self options:nil] objectAtIndex:0];
[self.view addSubview:xibView];
Now, a for instance, the loadNibNamed property should be? Name of the XIB file? Name of the view in that XIB file? Or what?
All this is bringing me errors and the app trows exeption.
I have no clue what so ever on how to work with XIB files since I super new to Objective-c coding.
Any help would be really appreciated!!!
Thanks!
The XIB, which is referred to as a NIB (as a matter of history), defines at least one view that is to be "controlled" by a view controller. This view can represent the whole user interface or simply a subview of another view (e.g. your XIB could represent a reusable table row). Thus, you should not be using a XIB as a sort of container for pre-built interface elements in the manner you describe.
However, it is simple to work with the components of the XIB provided your controller knows about them. That is, the elements of your XIB should connect to properties of your view controller class.
For example, let's say you have the following view controller interface:
#import <UIKit/UIKit.h>
interface MyViewController : UIViewController {
}
#property (strong, nonatomic) IBOutlet UITextView *textEntry;
#property (strong, nonatomic) IBOutlet UIButton *enterButton;
A corresponding NIB would be named MyView.xib. In the interface builder, you would set the "File's Owner" for the NIB to be "MyViewController". You would then link the interface elements, a UITextView and a UIButton, to MyViewController's properties (in whatever method you prefer - usually an option+click & drag from the interface element to the File's Owner object).
Having done this, you can then instantiate the view controller anywhere you please and work with the properties of that object. For example, let's pretend this code is in a file named "SomeOtherController.m":
- (void)aMethodOfSomeOtherController
{
MyViewController *myView = [[MyViewController alloc]
initWithNibName:#"MyViewController"
bundle:nibBundleOrNil];
NSString *buttonLabelText = [[[myView] enterButton] titleLabel] text];
NSLog(#"Button label text = %#", buttonLabelText);
[myView release];
}
When this method is invoked, an instance of MyViewController will be created which will automatically load the stored objects from the NIB and bind them to the view controller object's properties. It will then retrieve the text of the button's label and write it to the log console.
If you want to load an UIView from NIB, this code would be more correct (since you don't know the index of a needed object in the xib file).
- (id)loadViewFromNIB:(NSString *)nibName owner:(id)owner class:(Class)_class
{
NSArray *objects = [[NSBundle mainBundle] loadNibNamed:nibName owner:owner options:nil];
for (id object in objects) {
if ([object isKindOfClass:_class]) {
return object;
}
}
}
If you look at the documentation for UIViewController, there's a method called initWithNibName:bundle:. It lists five different sample code projects that Apple provides to demonstrate how to use xib files and view controllers. You should read a few of those to get a basic understanding.
Open MyLib.xib in interface builder and check that you actually have a UIView component in that file.
What error message do you get from the exception?
I have been working on this for 2 days now, cant seem to get a grasp. I'm missing something very basic I guess.
Here's what I have:
A UIViewController as the Apps root controller.
There's a ContainerView, a subclass of UIView which I add to my root controller view.
Within that I want a UITableView.
Since there are several different Containers, I have different Nibs for each.
Heres how its wired: Nib with content, has the container as its file's owner. There's an outlet to the UITableView, it has the container as source and delegate.
The container implements the protocol methods.
Now I can't call reloaddata on the UITableView since it's nil. I type po in the consolo and it says 0x0 but I don't know why.
I have been trying different approaches, but all ended up in losing the reference to the tableView.
It's not like it's my first tableview I create but I have no clue on what I'm doing wrong here.
Any HELP please!!!!
Code:
This is my Outlet:
IBOutlet UITableView *contactsTV;
File's owner has a connection to it, the tableview vice versa.
I create the nib by doing:
Contentview *v = [[Contentview alloc] initWithFrame:[[contentViewArray objectAtIndex:i] CGRectValue]];
while contentViewArray is some array storing Framevalues as strings.
Then I do:
[v prepareView];
and it looks like this:
- (void) prepareView {
NSArray *mediaPlayerViews = [[NSBundle mainBundle] loadNibNamed:#"MyView"
owner:self
options:nil];
UIView *v = (UIView *)[mediaPlayerViews objectAtIndex:0];
[self addSubview:v];
}
Just experienced a similar issue -- everything appeared wired up correctly (Xcode 4) but the outlet reference was nil.
When I created the file, I used the "New File" -> subclass of UITableViewController. with NIB (automatic) process to set up the file. This resulted in the controller being declared as a UITableViewController and the NIB had a UITableView as it's root.
Although the TableDataSource and TableDelegate methods got called as expected, the outlet for the TableView was never being set when the nib was loaded.
To fix this, I basically had to change the controller from being a subclass of UITableViewController to just UIViewController and set the NIB accordingly: I cleared the NIB, added a UIView with a UITableView as a child, reconnected the outlets (View, TableView, TableDataSource, and TableDelegate), and it all worked as planned.
I think this may be a bug with XCode, when creating a subclass of UITableView with NIB.
Set it as a UITableViewController it should work.
Do you have property set in header file along with
IBOutlet UITableView *contactsTV
?
If you don't have setter method for your contactsTV, then your contactsTV isn't retained by your object.
Try to replace your code with
//header file
UITableView *contactsTV;
#property(nonatomic, retain) IBOutlet UITableView *contactsTV;
//implementation file
#synthesize contactsTV;
I have a UIViewController. The UIViewController has a NIB with one outlet - a UIView, containing several buttons and labels. Imagine, it is something like a UIDatePicker.
In order to not be forced to copy and paste all the controlling code into a new environment, I was trying to encapsulate the UIView into a separate UIView subclass with an own NIB, sort of a C# CustomControl approach.
From a controlling (other) UIViewController I'm instantiating the view from the NIB
NSArray *nibObjects = [[NSBundle mainBundle] loadNibNamed:#"MyView" owner:self options:nil];
selectorView = (DateTimeSelectorView*)[nibObjects objectAtIndex:0];
selectorView is a property in the using UIViewController class. The problem: "initWithFrame" of my UIView is never called. My UIView is covering the whole space (320x480), whereas it should have a smaller size. How can I achive this? Furthermore the UIView seems to hide all other controls, instantiated from the UIViewController class.
Regards
When a view is instantiated by the nib loader, initWithFrame: isn't called. The nib loader calls initWithCoder:. You should implement initWithCoder to perform any initialization, including setting the frame.
So here is a "HowTo" for the question: How to embed a self-contained UIView into my UIViewController with NIB?
1) Say you have a UIView with a button and a textfield, making some login. You have the UI in a separate NIB called Login.xib. The functionality is in Login.m and Login.h, a subclass of UIView. The class name is "Login". Take care, that the class is set properly in Login.xib. Everything is fine.
2) Now you want to use this "out of the box" in a new app.
3) Drag the three files (Login.m, Login.h and Login.xib") into your new UIView based project
4) Add a property in your UIViewController class, pointing to your Login class (of course, include the Login.h first)
5) Open IB with Login.xib and set the file's owner to your current UIViewController class
6) Connect the main view of your Login.xib with the property defined in UIViewController (!! this is important !!)
7) Add the following to your viewDidLoad in UIViewController (supposed, the name of your property is "myLogin")
[[NSBundle mainBundle] loadNibNamed:#"Login" owner:self options:nil];
myLogin.frame = CGRectMake(0 ,100, 320, 200); // Optional, you may also use the initial bounds
[self.view addSubview:myLogin];
The view will appear where you let it appear. Other controls from your superview will be available too.
It took me several hours to find that out. There is here and there some scattered info, but I didn't find a complete "how to" for that simple task up to now.
Regards
I have a View Controller inside my MainWindow.xib file that loads the nib "Cover" when loaded. Cover (and the rest of my pages) is simply a nib file containing it's Owner, First Responder and a View. There is also an associated class declaration.
In MainViewController.m I have:
- (void)viewDidLoad {
[[NSBundle mainBundle] loadNibNamed:#"Cover" owner:self options:nil];
[super viewDidLoad];
}
This successfully loads the Cover of my app. On a button press I'd like to have a function switch Cover with Page1. I tried:
-(IBAction)funcGoToPage:(id)sender{
[[NSBundle mainBundle] loadNibNamed:#"Page1" owner:self options:nil];
}
This function is also in MainViewController. I know the function is being called but It doesn't seem to do anything. Is the new nib showing up underneath the current nib? Do I have to release the current nib?
Depending on how you want users to navigate, you either need to add the view of the nib as a subview to your current view, or push a new viewController on to the stack using a navigationController. Here is a tutorial on using a navigationController. Or, if you just want to exchange them, here is a link to a SO answer for just that.
I have a nib call "Hello.xib", and I have a HelloView that is inherit from the UIView, and I want to do the layout in the Hello.xib, and I want to allocate them to the HelloView.m / HelloView.h, how can I do so? Thank you.
You normally do so on the outside. In HelloView you should have a UIViewController derived class. Then when initializing it on the outside you would call:
hello = [[HelloViewController alloc] initWithNibName:#"Hello" bundle:nil];
The bundle:nil make Cocoa use the default bundle.
In the interface builder's inspector for your Hello.xib's view, set the class of the view (in identity tab) to HelloView. I hope thats what you are looking for.
Just today I wrote a demonstration code, that also uses instantiation of custom view by loading a nib
the controller has a member DetailContactHeaderView *headerView
in the nib, I have a DetailContactHeaderView and the Files' owner type is my Controller
the files' owner property headerView and the View get Connected
in this controller I have this code
[[NSBundle mainBundle] loadNibNamed:#"DetailContactHeader" owner:self options:nil];
See my MyContacts for an implementation.
FYI:
DetailContactHeaderView
DetailContactHeader.xib
DetailContactViewController
especially -tableView:viewForHeaderInSection: