Question

伙计们已经开了好几个小时.... :(

我有一个加载到scrollview

的控制器数组

我想将值分配给Label'Category'，但我无法执行此操作 - 该值显示为NULL ??

但我可以在方法viewDidLoad中对此进行硬编码？

我尝试了几种方法，但都没有用？ ...

我的.h文件看起来像这样......

@interface ReviewCategoryViewController : UIViewController {
    @public
    UILabel *CategoryTitle;
}

- (id)initWithCategory:(NSString *)category;
- (id)setCategory:(NSString *)category;

@property (strong, nonatomic) IBOutlet UILabel *CategoryTitle;

@end

我的实现看起来像这样......

- (id)setCategory:(NSString *)category
{
    [self.CategoryTitle setText:category];
    NSLog(@">>2. Category %@ %@", category, CategoryTitle.text);

    return self;
}

// load the view nib and initialize the pageNumber ivar
- (id)initWithCategory:(NSString *)category
{
    self = [super initWithNibName:@"ReviewCategoryViewController" bundle:nil];

    [self.CategoryTitle setText:category];
    NSLog(@">>1. Category %@ %@", category, CategoryTitle.text);

    return self;
}

我对该方法的调用看起来像这样......

    ReviewCategoryViewController *controller = [viewControllers objectAtIndex:cardNo];

    if ((NSNull *)controller == [NSNull null])
    {
        NSString *temp = [categories_array objectAtIndex:cardNo];

        controller = [[ReviewCategoryViewController alloc] initWithCategory:temp];

        [controller setCategory:temp];

        [viewControllers replaceObjectAtIndex:cardNo withObject:controller];
    }

我的日志显示以下内容????

2013-04-12 16:54:27.507 Review Writer[14455:11603] >>1. Category Adapability **(null)**
2013-04-12 16:54:27.509 Review Writer[14455:11603] >>2. Category Adapability **(null)**

Answer 1

- (id)initWithCategory:(NSString *)category
{
    seidlf = [super initWithNibName:@"ReviewCategoryViewController" bundle:nil];

    [self.CategoryTitle setText:category];
    NSLog(@">>1. Category %@ %@", category, CategoryTitle.text);

    return self;
}

致电self = [super initWithNibName:@"ReviewCategoryViewController" bundle:nil];后，您的商店的链接尚未建立。您只能在viewDidLoad方法

中加载视图后使用您的商店

Answer 2

您可以在全局变量中设置类别，并在didLoad方法中设置标签文本：

- (id)initWithCategory:(NSString *)category
{
    self = [super initWithNibName:@"ReviewCategoryViewController" bundle:nil];

    // categoryStr is a global NSString var
    categoryStr = category;

    return self;
}

- (void)viewDidLoad
{
    [self.CategoryTitle setText:categoryStr];
}

在显示之前无法为控制器中的标签赋值？

2 个答案: