ios - IBOutlet Label 获取不到数据

Question

您好，我是 StackOverFlow 和 iOS 6 的新手。

对于有经验的开发人员来说，这将是如此简单..

在.h文件中..

@interface NotKnownDetailView : UITableViewController
@property (weak, nonatomic) IBOutlet UILabel *wordLabel;
@end

在 .m 文件中..

@interface NotKnownDetailView ()
    - (void)configureView;
@end

@implementation NotKnownDetailView
@synthesize  wordLabel = _wordLabel ;

- (void)configureView{

    wordData *theSighting = self.word_data;

    if (theSighting) {

        UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Hello World!"
                                                          message:theSighting.verbal
                                                         delegate:nil
                                                cancelButtonTitle:@"OK"
                                                otherButtonTitles:nil];
        [message show];

        self.wordLabel.text = theSighting.word;

        UIAlertView *message2 = [[UIAlertView alloc] initWithTitle:@"Hello World!"
                                                          message: self.verbalLabel.text
                                                         delegate:nil
                                                cancelButtonTitle:@"OK"
                                                otherButtonTitles:nil];
        [message2 show];

    }
}

问题如下..

self.wordLabel.text = theSighting.word;

尽管theSighting.word有数据，但是self.wordLabel.text不包含任何数据...

当然，我在 Storyboard中连接了 IBOutlet。

上面有什么问题？

已编辑。我添加了源代码的一部分。我希望你不会对此感到不舒服。

//  NotKnownDetailView.h
#import <UIKit/UIKit.h>

@class wordData ;

@interface NotKnownDetailView : UITableViewController
@property (strong, nonatomic) wordData *word_data;
@property (weak, nonatomic) IBOutlet UILabel *wordLabel;
@property (weak, nonatomic) IBOutlet UILabel *meanLabel;
@property (weak, nonatomic) IBOutlet UILabel *verbalLabel;
@end


//  NotKnownDetailView.m

#import "NotKnownDetailView.h"
#import "wordData.h"

@interface NotKnownDetailView ()
//@property (strong, nonatomic) UIPopoverController *masterPopoverController;
- (void)configureView;
@end

@implementation NotKnownDetailView
@synthesize word_data = _word_data, wordLabel = _wordLabel, meanLabel = _meanLabel, verbalLabel = _verbalLabel;

// it is getter setter.. 
- (void)setWord_data:(wordData *) newWord
{
    if (_word_data != newWord) {
        _word_data = newWord;
        [self configureView];
    }
}
- (void)configureView
{

    wordData *theSighting = self.word_data;

    if (theSighting) {
        NSLog(@" Word : %@" ,theSighting.word);

        self.wordLabel.text = theSighting.word;
        self.meanLabel.text = theSighting.mean;
        self.verbalLabel.text = theSighting.verbal;

    }
}
- (void)viewDidUnload
{
    self.word_data = nil;
    [super viewDidUnload];
}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
   [super viewDidLoad];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];

}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

}

@end







//  wordData.h

#import <Foundation/Foundation.h>

@interface wordData : NSObject

@property (nonatomic, copy) NSString *word;
@property (nonatomic, copy) NSString *mean;
@property (nonatomic, copy) NSString *verbal;
-(id)initWithName:(NSString *)word meaning:(NSString *)mean verbaling:(NSString *)verbal;
@end


//  wordData.m

#import "wordData.h"

@implementation wordData
@synthesize word = _word, mean = _mean , verbal = _verbal ;

-(id)initWithName:(NSString *)word meaning:(NSString *)mean verbaling:(NSString *)verbal{
    {
        self = [super init];
        if (self) {
            _word= word;
            _mean = mean;
            _verbal = verbal ;
            return self;
        }
        return nil;
    }

}
@end

SOLED。

Answer 1

我认为你在 -(void)viewDidLoad 之前调用了 -(void)configureView，在这种情况下 wordLabel 是 nil 当您尝试为其分配任何内容时。

尝试在 -(void)viewDidLoad 中调用 -(void)configureView

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self configureView];
}