Class not being read ... Unknown type name

Question

I'm unsure what is going on or what I changed, but all of a sudden a class I'm trying to reference "that is in the project tree" and in the folder (when I "show in finder") isn't being read at all ... I get multiple errors on the same line of code [see attached].

enter image description here

Please Help!!!

The issue occurs when I try to import HomeViewController.h into my MainContainerViewController

Works:

#import <UIKit/UIKit.h>
#import "ViewController.h"

@interface MainContainerViewController : UIViewController {

ViewController *parent;

NSString *FACING;
IBOutlet UIView *container;

IBOutlet UIView *topNav;

IBOutlet UIButton *homeBTN;
IBOutlet UIImageView *homeImg;
IBOutlet UILabel *homeLabel;
IBOutlet UIImageView *seperator1;
IBOutlet UIButton *bookmarksBTN;
IBOutlet UIImageView *bookmarksImg;
IBOutlet UILabel *bookmarksLabel;
IBOutlet UIImageView *seperator2;
IBOutlet UIButton *favouritesBTN;
IBOutlet UIImageView *favouritesImg;
IBOutlet UILabel *favouritesLabel;
IBOutlet UIImageView *seperator3;
IBOutlet UIButton *notesBTN;
IBOutlet UIImageView *notesImg;
IBOutlet UILabel *notesLabel;
IBOutlet UIImageView *seperator4;
IBOutlet UIButton *fontBTN;
IBOutlet UIImageView *fontImg;
IBOutlet UILabel *fontLabel;
IBOutlet UIImageView *seperator5;
IBOutlet UIButton *settingsBTN;
IBOutlet UIImageView *settingsImg;
IBOutlet UILabel *settingsLabel;

NSString *drawerIsAnimating;

//SETTINGS (LOCAL)
NSString *fontSize;

etc.

Broken:

#import <UIKit/UIKit.h>
#import "ViewController.h"
#import "HomeViewController.h"

@interface MainContainerViewController : UIViewController {

ViewController *parent;

NSString *FACING;
IBOutlet UIView *container;

IBOutlet UIView *topNav;

IBOutlet UIButton *homeBTN;
IBOutlet UIImageView *homeImg;
IBOutlet UILabel *homeLabel;
IBOutlet UIImageView *seperator1;
IBOutlet UIButton *bookmarksBTN;
IBOutlet UIImageView *bookmarksImg;
IBOutlet UILabel *bookmarksLabel;
IBOutlet UIImageView *seperator2;
IBOutlet UIButton *favouritesBTN;
IBOutlet UIImageView *favouritesImg;
IBOutlet UILabel *favouritesLabel;
IBOutlet UIImageView *seperator3;
IBOutlet UIButton *notesBTN;
IBOutlet UIImageView *notesImg;
IBOutlet UILabel *notesLabel;
IBOutlet UIImageView *seperator4;
IBOutlet UIButton *fontBTN;
IBOutlet UIImageView *fontImg;
IBOutlet UILabel *fontLabel;
IBOutlet UIImageView *seperator5;
IBOutlet UIButton *settingsBTN;
IBOutlet UIImageView *settingsImg;
IBOutlet UILabel *settingsLabel;

NSString *drawerIsAnimating;

//SETTINGS (LOCAL)
NSString *fontSize;

etc.

Please, avoid writing full sentences in caps. It's not only unpleasant to read, like EULA per example, it also means you're shouting at us. You can use styles if you need to hilite some parts of your question. — fabrice truillot de chambrier, Jun 22 '12 at 20:30
Note that there is no error on the import statement, suggesting that the .h file was found OK. There's something preventing the class from being fully declared -- a misplaced semicolon, missing @end statement, etc. — Hot Licks, Jun 22 '12 at 20:34

fabrice truillot de chambrier · Accepted Answer · 2012-06-22T21:18:54.760

8

You may have a header import cycle.

Add

@class MainContainerViewController2;

just before

@interface HomeViewController2

It should solve that particular issue.

As a rule of thumb, you shouldn't #import headers in headers if you do not have an absolute need to do so, ie. a superclass header. If you need to use a class, declare it with @class instead of importing the class header. Do that and you should be safe 99% of the time.

edited Jun 22 '12 at 21:18

answered Jun 22 '12 at 20:28

fabrice truillot de chambrier

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If there's a cycle it's more likely to be in the .h file itself. – Hot Licks Jun 22 '12 at 20:31
Absolutely. MainContainerViewController2.h most certainly imports HomeViewController2.h, or whatever the files are called. – fabrice truillot de chambrier Jun 22 '12 at 20:31
Something's fishy in MainContainerViewController2.h then. Could you provide some details? – fabrice truillot de chambrier Jun 22 '12 at 20:41
Yes, it seems that I was importing MainContainerViewController into HomeViewController, and then was importing HomeViewController into MainContainerViewController ... thanks. – Chris Allinson Jun 22 '12 at 21:15
1

Cool. Glad I could help. I edited my answer about the use of #import in headers, and @class. This may help for the future. :) – fabrice truillot de chambrier Jun 22 '12 at 21:20

score 0 · Answer 2 · answered Jun 22 '12 at 20:26

0

The file may not be included in the target you are building.

answered Jun 22 '12 at 20:26

GBegen

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score 0 · Answer 3 · answered Jun 22 '12 at 20:28

0

Try to check MainContainerViewController2 target.

Click on MainContainerViewController2 .m and .xib and check in the Utilities panel (View > Utilities > Show File Inspector) if the checkbox is ticked into Target Membership section.

answered Jun 22 '12 at 20:28

Phillip

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The .h should not have the membership box checked. – Hot Licks Jun 22 '12 at 20:29
Both the .m and .xib files have that checkbox checked – Chris Allinson Jun 22 '12 at 20:29
Hot Licks correct observation. Chris, try `@class MainContainerViewController2`before `@interface` – Phillip Jun 22 '12 at 20:31

score 0 · Answer 4 · answered Jun 22 '12 at 20:28

0

First check VERY CAREFULLY your MainContainerViewController2.h file to see if there are any wayward characters anywhere in the file.

answered Jun 22 '12 at 20:28

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Class not being read ... Unknown type name

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