Class not being read … Unknown type name

问题:

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].

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.

回答1:

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.

回答2:

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

回答3:

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.

回答4:

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