Objective-c 子类找不到超类接口时出错

Question

我一直在开发一个使用集合视图的应用程序，我正在创建一个自定义视图单元格（类别视图单元格），它是 UICollectionViewCell 的一个子类。我还想创建自定义视图单元 (LinkCell) 的子类。我已经搜索了一段时间，但找不到我收到错误 "Cannot find interface declaration of 'CategoryViewCell', superclass of 'LinkCell'"

的原因

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

@class ViewController;

@interface CategoryViewCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UIImageView *image;

@property (nonatomic) ViewController *parentView;
@property (nonatomic) NSString *cellName;

@end
//CategoryViewCell.m
#import "CategoryViewCell.h"

@implementation CategoryViewCell

@end

//LinkCell.h
#import <UIKit/UIKit.h>
#import "CategoryViewCell.h"
#import "PJP Webview.h"

@interface LinkCell : CategoryViewCell //Error here

@property (nonatomic) NSString *username;
@property (nonatomic) NSString *password;
@property (nonatomic) NSString *urlToLink;
@property (nonatomic) NSString *urlToLinkS;
@property (nonatomic) NSString *urlToLinkP;
@property (nonatomic) NSString *urlToLinkT;
@property (nonatomic) NSString *body;

-(IBAction)celltapped:(id)sender;

@end
//LinkCell.m
#import "LinkCell.h"

@implementation LinkCell

@synthesize urlToLink, username, password, image, cellName, parentView;

-(IBAction)celltapped:(id)sender {

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSString *launchString = [NSString stringWithFormat:@"hasLaunched%@Before", self.cellName];
    BOOL hasLaunchedCellBefore = [userDefaults boolForKey:launchString];
    if (!hasLaunchedCellBefore) {
        // first time launch code

        hasLaunchedCellBefore = TRUE;
        [userDefaults setBool:hasLaunchedCellBefore forKey:launchString];
        [userDefaults synchronize];

        PJP_Webview *vc = [parentView.storyboard instantiateViewControllerWithIdentifier:@"vc"];
        vc.currentCell = self;
        [parentView presentViewController:vc animated:YES completion:nil];
    }
    else {

    }
}

@end

谁能告诉我我的错误在哪里？

Answer 1

选择文件 CategoryViewCell.m 并检查它是否已添加到目标。

Answer 2

我刚刚解决了； ViewController.h 使用 CategoryViewCell，我导入了 .h 并将 @class 用于 CategoryViewCell.h 上的 ViewController 属性。只有 @class 是必需的；我想创建了某种循环依赖。奇怪的是 CategoryViewCell.h 没有错误，它的 subclass 有错误。感谢所有回答的人！

Objective-c 子类找不到超类接口时出错

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