Chris Allinson Chris Allinson - 15 days ago 6
iOS Question

Class not being read ... Unknown type name

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.

Answer

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.

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