iOS: Methods of ViewController subclass not visible in other classes - objective-c

Question

I'm currently trying to develop an iPhone application.
Most things are working as I would expect and prefer.
Right now the issue I'm having is that when adding methods to one of my ViewControllers the methods are not visible from other parts of my applications.
When I add the same methods, with the same signature to my other view controllers they will be visible.
I've googled, browsed stackoverflow, reread, copy/pasted, and prayed to the spaghetti monster for divine insight, but to no avail.
There must be some minor detail, that I in my folly am overlooking. I hope you will be able to help me!
InfoPageViewController.h
#import <UIKit/UIKit.h>
#import "DB.h"
#interface InfoPageViewController : UIViewController
{
IBOutlet UIWebView* wv;
DB* db;
}
#property (retain, nonatomic) IBOutlet UIWebView* wv;
-(void) reloadInfoPage;
#end
InfoPageViewController.m
#import "InfoPageViewController.h"
#interface InfoPageViewController ()
#end
#implementation InfoPageViewController
#synthesize wv;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = NSLocalizedString(#"Information", #"Information");
self.tabBarItem.image = [UIImage imageNamed:#"TabIcon-Settings"];
db = [[DB alloc] init];
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
DBInfoPage* dbip = [db getInfopage];
[wv loadHTMLString:dbip.html baseURL:nil];
//NSLog(#"word%#", dbip.html);
[self reloadInfoPage];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
-(void)reloadInfoPage
{
DBInfoPage* dbip = [db getInfopage];
[wv loadHTMLString:dbip.html baseURL:nil];
NSLog(#"reloading infopage%#", #"");
}
#end
infoviewtest.h
#import <UIKit/UIKit.h>
#import "InfoPageViewController.h"
#interface infoviewtest : NSObject
#end
infoviewtest.m
#import "infoviewtest.h"
#implementation infoviewtest
-(void)test
{
InfoPageViewController* ivc = [[InfoPageViewController alloc] init];
[ivc reloadInfoPage];
}
#end
This yields an error of "No visible #interface for 'InfoPageViewController' declares the selector 'reloadInfoPage'.
I have also tried to use autocomplete to show me the available methods of the 'InfoPageViewController', this yields a list not containing 'reloadInfoPage', similarly the instance variable 'wv' is not visible from outside of the scope of the class.
I have tried closing and reopening xcode, as well as restart the computer.
I have also tried to 'clean' the project.
Any help will be greatly appreciated by the parts of my hair, not yet pulled in frustration.
If I have been lacking in providing information, please request and I'll do my best to respond.
Johan Abildskov

Answer 1

Actually your code look correct - all you have to do is probably clean the project and possibly restart XCode.
But you could optimize the linking/compiling by making some modifications like:
infoviewtest.h
#import <UIKit/UIKit.h>
//#class InfoPageViewController; //add this if you'll be adding ivar or property of this type
#interface infoviewtest : NSObject
#end
infoviewtest.m
#import "infoviewtest.h"
#import "InfoPageViewController.h" //here's the place to import other headers
#implementation infoviewtest
-(void)test
{
InfoPageViewController* ivc = [[InfoPageViewController alloc] init];
[ivc reloadInfoPage];
}
#end
EDIT: Make sure that your implementation of DB class is correct. XCode error might lead you to wrong assumptions. Again: the code you've posted seems correct, just not optimized for compilation.

Answer 2

I've noticed an odd issue with test targets, when you don't include a class in the test target it still compiles, this could could be whats happening here so:
Have you included InfoPageViewController in your test target?

Answer 3

Your code is perfect it seems. Even DB.h having the same method name, it will not affect the declaration of the same method in your controller class. Its quite strange error. Probably your XCode might get corrupted. Try to update Xcode and try the same code. If you are updating Xcode, update the iTunes too. This may fix your problem I think.

Answer 4

Just in case anyone else is suffering from this weird problem as I just did - the cause in my case was due to my ending up with 2 copies of the same class .m & .h files in different directories of my project after my Xcode newbie fumbling attempt to move them from one disk directory to another while keeping them in the same Xcode group. Xcode ended up allowing me to edit one set of files but used the other for compilation so the method that I added really didn't exist as far as the compiler was concerned, hence the above error message.