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
Related
Im playing with this project SquareCropViewController It is a helper for crop images to square. Inside project there are two versions, one made with auto-layout and one that works purely programmatically. I want to use programmatic version and integrate in my project, which works with storyboards.
In programmatic version there are several files
ProgrammaticController.swift
ProgrammaticController.xib
What is the sequence of actions to make it run in my project ? Do I have to create new viewcontroller and import xib inside it? If yes what is syntax ? I have never worked with xibs before and help will be much appreciated.
Thanks in advance
You should be able to just instantiate the class if it's hooked up correctly in the xib.
var controller = ProgrammaticController()
navigationController.push(controller, animated:true)
The file's owner's class needs to be set to the actual class in the xib for that to work.
First off, I will say i've spent 6 hours on this topic and have read everything the internet has to provide, which is why i came here.
I have converted to Universal, Xcode created the MainWindow-iPad.xib and everything seems fine.
Here are my questions:
1) What are the naming conventions for new iPad-specific xibs? Xcode created "-iPad" but i believe im supposed to be making them "~ipad". Why the difference?
2) (MOST IMPORTANT) After creating several "~ipad" xibs, Xcode seems to know to load these. So I'll copy the content in say, "RootViewController.xib"
and paste it in "RootViewController~ipad.xib". THIS IS THE PROBLEM: this new ~ipad xib has no outlets or referencing outlets!
I can't link the buttons on my page to anything. How do i do this without having a separate ~ipad .m and .h for everything?
Thank you guys for your help! I'm going to write a tutorial on this once I get this all working.
Just set the class of that ~iPad nib to be the same classname as the cooresponding iPhone nib. This is done in the inspector in Interface Builder. You may have to connect the outlets back up depending on the order you do things. I would think that if you copy the objects from the iPhone nib to the iPad nib AFTER you set the class, then the outlets would stay wired up.
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 had a class called OptionsTableViewController which inherited UITableViewController. I changed the superclass to UIViewController implementing the UITableViewDelegate and UITableViewDataSource protocols, because I needed the tableView to be in a specific position.
Now some table cells have a UISwitch as accessoryView. The switch is an instance variable, initialized With CGRectZero.
When changing the superclass to UIViewController the switches are not shown. But when I also rename the class (to OptionsViewController f. e.) it works.
Does anybody know where this strange behavior comes from?
I also tried to clean the project and I even deleted the build folder - but it seems, that the only solution is to rename the class.
I had a similar problem before, where the whole table view would not be shown unless the class was renamed.
Did you check to see if the names OptionsTableViewController and OptionsViewController are used anywhere else in your entire project, including in Interface builder nib files? Did you change all the names, as appropriate?
I found the reason for this problem. Although searching through the project XCode wouldn't find any files named OptionsTableViewController, but I found it included under Targets -> AppName. The file wouldn't disappear after Clean All Targets, so it is good to know that there still remain parts in there.
I've choosen the "view-based" application template in Xcode. The myProjectViewController.m has the following code:
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
That sounds good. But: The template generated a myProjectViewController.xib file. What I dont get is: How does Xcode connect the ViewController with that nib? Where's the part in the template code that says: "Hey, load that myProjectViewController.xib now!"? I mean... can I just delete that not-wanted nib file without setting anything else up appropriately?
You may wish to refer to my answer to this question, where I describe the specific files that need to be altered to do completely programmatic generation of your view hierarchy.
Also, some of the references linked to in the answers to this question may be of use to you.
yep you can just delete the nib and implement that method
IB connects using the name of the class in the NIb, in IB you actually set a view as the file owner of the view. so when you call initwithnib:"nibfilename" it knows what you are talking about.
The elements are wired up using IBOutlets and IBActions