i would just want to ask why i cannot create an iboutlet (e.g. UITableView). I copied a nib file, the .h and .m file from my different project(since I need them). After that, I renamed the .h, .m and the nib file. Then when I am going to add or connect IBOutlets to it, I can't. Why? Does someone know how to fix it? thanks a lot.
This is because you need to provide a new class name which the xib refers to (as you said you renamed it)
Maybe You forgot change class name in .xib file.
Try following steps for renaming .h,.m and xib files. This will be Helpful for you.
1) Go to the header file eg. MyViewController.h.
2) Right click on your class name eg. Right click on MyViewController.
3) Select Refactor -> Rename.
4) Write New Name eg. MyViewController1.
5) Preview and Save.
This will rename your Old class name with New Class name from everywhere.
And Also check File Owner's Custom class property under Identity Inspector Section is the same as New Class name
Related
I have created a class 'abc' which a subclass of UIViewController. At the time of creating it i clicked the option for creating an xib for it automaticaly. Now the xcode creates 3 files for me
1. abc.h
2. abc.m
3. abc.xib.
Now whenever i create an object of abc class like
abc *a=[abc alloc];
Even when i am not initialising the object with initiwithNibName and using it, it is loading the xib file. So how this xib file got associated with the abc object. And even if i deleted the abc.xib, then also it loads that xib file. I couldnt understand from where it is loading the xib file, if it it not present in the project space. And where the association of xib and controller is stored?
Thanks in advance.
What's going on is that the default implementation of initWithNibName:bundle: searches the Main Bundle for a Nib file that has the same name as your View Controller class. This happens whether you select the option for creating the Nib automatically or not. See UIViewController documentation (the discussion portion of initWithNibName:bundle:).
Now the initWithNibName:bundle: method is UIViewController's default initializer, which means that even if you don't use it directly (say that you use init instead) it will get called under the hood anyway.
Finally, even if you delete the Nib file from XCode, for some reason (not sure why) it doesn't get deleted from the Main Bundle (at least in the simulator). Even if you clean & build the project it stays there. The solution I use to get completely rid of the Nib file is to delete the App from the simulator, then clean & build again.
Hope this helps!
The xib is probably still in your compiled area, so you need to perform a clean to get rid of it fully. (Product >> Clean). The default init method of UIViewControllers will automatically look for a xib of the same name, which is why it's still allocating that xib. Once you clean it will stop.
Reference:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/initWithNibName:bundle:
Note this part: If you specify nil for the nibName parameter, you must either override the loadView method and create your views there or you must provide a nib file in your bundle whose name (without the .nib extension) matches the name of your view controller class. (In this latter case, the class name becomes the name stored in the nibName property.) If you do none of these, the view controller will be unable to load its view.
I am learning iPhone Obj C slowly. I have a XIB with several views and all works well. I need to have a 2nd XIB to control another set of views but haven't been able to make it work.
So I created the 2nd class and a 2nd XIB, all called one.h one.m one.xib and the same for the new one is all two.*
As it didnt work I was going try and change the app to start on the TWO class rather than the ONE class. In the plist I changed the Main Nib base file but that didnt seem to do anything.
Where do you specify what the start up class is? That way I can make sure I did everything correctly first, and then go back to the code that is supposed to call the two class and xib.
Also if anyone has any sample code to go from one class and xib to another, please let me know.
thanks!
In your AppDelegate class make sure the ViewController being allocated and set to the window is the one desired.
Your project's [ProjectName]-Info.plist file decides which Nib file is used when the application starts, in the key NSMainNibFile. (By default, this is set to MainWindow.)
A standard MainWindow.nib file will define the "root" class, which is usually [ProjectName]AppDelegate. You can, however, change this by editing the nib.
I had to set the CLASS IDENTITY to the proper class for the app delegate on the XIB for both XIB.
Then I changed the plist to point to the XIB I wanted to start as root.
Both of the answers above helped me find this.
THANK YOU
I'm following a tutorial from the book "Beginning iPhone Development", chapter 12.
I have a class called QuartzFunView with .h and .m files.
If I double click on my blaViewController.xib file, then click on "View" and in the Identity Inspector try to change the Class (Class identity) from UIView to QuartzFunView, my computer just beeps and stays as UIView. I can change the class to all the UI.. classes and any other random letter combination I choose, just not QuartzFunView. What am I doing wrong?
I am writing this as answer because people do not need to read comment for answer
That existing class QuartzFunView must be a sub class of UIView class to be able to set as identifier of any UIView in xib file.
I've renamed a UITableViewController class in Xcode, which was used as a parent class in a XIB. The Interface Builder still uses the old name for that class and it compiles and works fine. Interface Builder doesn't see the new name of the class and when I try to type in manually, it compiles and gives me an exception at the runtime: "Unknown class ... in Interface Builder file."
Is there a way to update the class name in the Interface Builder?
Thanks
Have you tried to select "File -> Reload All Class Files" in Interface Builder? Maybe that should work!
you can try...
Clean and rebuild project
delete XIB from project and create new one with new class
delete class and XIB both from project (reference), copy them somewhere else and Add new file with XIB user interface in your project and copy everything from old class file to new class file...
One out of these three should work...
Close your Interface Builder completely.
And Open that XIB from XCode.
Then it will display your renamed class.
I sometimes have problems with IB not noticing changes in class files.
What I do then is I drag the .h file from XCode to the window with .xib file inside of Interface Builder. That updates the class definition.
You can always reopen Interface Builder, but the above solution is quicker.
I am new to iPhone development so I have been working through some tutorials. What I don't understand is how xib fit into the work flow.
In a tutorial, one of the instruction is to create a new UIViewController subclass with "XIB for User Interface" selected. On my first try, I neglected to check that option and I thought may be I can just create the xib in Interface Builder but that didn't work. ( I created the xib using Cocoa Touch View Template, with the same name as the UIViewController and saved it the into project directory so it was added to the project.) I even changed the Class Identify for the File's Owner and hooked up the view outlet (the two differences I noticed when I inspected the xib generated from Xcode.)
So what are the differences between Xcode generated .xib (from UIViewController Template) and the IB .xib template?
XIB files created as part of the New File flow in Xcode have their File's Owner class pre-set, as well as certain outlets (view) already connected. Otherwise, there's not much difference.
The XIB File is basicly an uncompile NIB File, XIBs can always be edited in Xcode (unless they are outdated or corrupt) but most NIBs are compressed (flat) and are unopenable. However the older NIBs are bundles containing some source/archived including designable.nib which is often just the renamed XIB File and a keyedobjects.nib which is an other compiled NIB
NIB = Nxt Interface Builder
XIB = Xml Interface Builder
Although the new archived NIB files are unopenable to most applications including Xcode, they can still potentially be unarchived. I found this freeware application called NibUnlocker On The CharlesSoft Website which can potentially disassemble a compressed Nib file and exports it as an XIB document. This application is still fairly buggy but it is sometimes very accurate based on the Nibs contents.
(NibUnlocker is a very inaccurate name, Nibs are not locked they are archived)
Click to Download Nib Unlocker
If You wish to know a bit more you can read some additional information I have provided below in regards to the NIB and XIB Formats:
Nxt Interface Builder Anatomy:
Archived NIBs
A Compressed NIB file is complicated file to analyse but this is not impossible. The structure of these files are based off of a compacted property list (begins with "bplist00") and some of its contents are archived through NSKeyedArchiver. Since a NIB is formatted as a property list, This allows a small hack: if you actually change the extension of a Nib to .plist, eg. ArchivedNib.nib to ArchivedNib.plist You will actually be able to open it in Xcode viewing it as a Property List. When you view a Nib as a property list you will probably get a few base properties such as $version, $objects, $archiver and $top.
Useful Notes
A CFKeyedArchiverUID object is actually a redirector, in the {value = xx}, the value is an offset for a item in the $objects array from the start of the array. eg. <CFKeyedArchiverUID 0x60800002bc20 [0x7fffef6b8c30]>{value = 29}, value = 29, the result would be the 29th item in the $object's array. In Objective C you can retrieve this value from an NSArray with this method :
+ (NSUInteger)valueForKeyedArchiverUID:(id)keyedArchiverUID {
void *uid = (__bridge void*)keyedArchiverUID;
NSUInteger *valuePtr = uid+16;
return *valuePtr;}
like if this helped ;-)
I'm not sure I'm following your question. When you created a xib file in Xcode, attempting to edit the xib file will bring up IB. So effectively you are using IB to edit the xib file in Xcode. I never tried creating a "stand-alone" xib file in IB and then hook it up to a project in xcode.
The only reason such an approach may not work is that when you create the xib file within the context of a project, there are associations created (such as "mainnib file base name" attribute in the plist) which will not be automatically generated when you attempt to use a standalone xib file with the xcode project.
It sounds like you configured the view xib properly, by setting the View outlet and configuring the custom class for File's Owner, but perhaps the problem was with the UIViewController subclass.
If your view controller subclass had implemented the -[UIViewController loadView] method directly, it'd prevent the NIB from loading. In the default implementation, the UIViewController will load the NIB file with the same name as the view controller. If you override this method to initialize the view a different way (e.g. completely programmatically), the default implementation that loads the NIB won't run.
Deleting an override of the -[UIViewController loadView] method in your subclass, or ensuring the names match, might resolve any discrepancies.
XIBs are XML. Diff them and find out for yourself.