On the whole, a view controller is created exactly like any other object. A view controller instance comes into existence because you instantiate a view controller class, either in code or by loading a nib / xib / storyboard. Beginners are taught to make Apps with Storyboard and that is great. Storyboards and Segues are an amazing addition to Interface Builder now all rolled into Xcode.
When working on a client with another developer there were times when we would have merge conflicts due to just even peeking at the Storyboard (which serves as a good reference and documentation for the project). Almost every check-in we had to double check and redo some small change and we were checking in often. There were only two of us so as the team grows these merge conflicts I can only imagine would grow. For the reason of multi-developer environments there are firms who do away with not just Storyboards but Nibs / Xibs in their entirety. I thought I’d create an App with a TableViewController that has no NIB as a reference for those who have never seen how this is done. This code is in Github.
This code is at: https://github.com/duliodenis/TableViewNoIB
I use tags to demonstrate the stages of development I went through. Once you git clone you get the whole repository and you can do:
Then start by doing a
git checkout v1.0
This baseline version was created using the Xcode Empty Application Template. I added to the empty app a New Objective-C Class File for the View Controller which I simply called ViewController and subclassed NSObject in order to do everything manually.
Starting in the AppDelegate implementation I added the import of the new ViewController class and I declared the private myViewController property:
#import "ViewController.h" @interface AppDelegate() @property (nonatomic, strong) ViewController* myViewController; @end
Then in the didFinishLaunchingWithOptions method I added the following two lines to hook the rootViewController to this new ViewController:
self.myViewController = [[ViewController alloc] initWithStyle:UITableViewStyleGrouped]; self.window.rootViewController = self.myViewController;
The only other change I made was in the ViewController.h I had changed the subclass of NSObject to the following:
@interface ViewController : UITableViewController <UITableViewDataSource, UITableViewDelegate> @end
This makes myViewController a subclass of UITableViewController that follows the UITableViewDataSource and UITableViewDelegate protocols.
In the next v2.0 tag we’ll explore how to implement the TableView.