Question

我收到的错误似乎无法解决：

    *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
 reason: '-[UICollectionViewController setSearchString:]: unrecognized 
selector sent to instance 0x7fcd4b655930'

当我调用prepareForSegue方法时出现错误：

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    NSString *searchStringToPass = [[NSString alloc]initWithFormat:_inputField.text];
    UINavigationController *navController = [segue destinationViewController];
    ResultsCollectionViewController *rvc = (ResultsCollectionViewController *)([navController viewControllers][0]);
    NSLog(@"Search String to Pass is: %@", searchStringToPass);
    //[rvc setSearchString:searchStringToPass];
    rvc.searchString = searchStringToPass;
        //userViewController.user = [self.users objectInListAtIndex:[self.tableView indexPathForSelectedRow].row];

}

我想要的ViewController嵌入在导航控制器中。它的代码是：

#import "ResultsCollectionViewController.h"

@interface ResultsCollectionViewController ()
//@property(nonatomic, weak) IBOutlet UICollectionView *collectionView;
@property(strong, nonatomic) NSArray *flickrPhotos;


@end

@implementation ResultsCollectionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSLog(@"search string is %@",_searchString);
}

-(void)getFlickrPhotosWithSearchString:(NSString*)searchString{


}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

.h文件是：

#import "BaseViewController.h"

@interface ResultsCollectionViewController : BaseViewController <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@property (strong, nonatomic) NSString *searchString;



@end

任何人都知道问题是什么？提前谢谢了。

Answer 1

您报告以下错误消息：

- [UICollectionViewController setSearchString：]：无法识别的选择器发送到实例0x7fcd4b655930

请注意＆＃34;无法识别的选择器＆＃34;在错误消息中是您的searchString属性的setter访问器方法，但引用的类是标准UICollectionVieController，而不是您的自定义类。

这表明您忽略了在Interface Builder中为目标场景指定基类。故事板因此实例化了标准UICollectionViewController而不是您的自定义类，因此找不到您的searchString访问者方法。

通过prepareForSegue方法传递变量的问题

1 个答案: