DetailViewController以编程方式iOS

Question

我使用名为MZFormSheetController的自定义ModalViewController来显示UICollectionView的详细信息视图。目前我已在模态视图控制器中创建了属性，例如：

@property (strong,nonatomic) NSString *user;
@property (strong,nonatomic) NSString *caption;
@property (weak, nonatomic) IBOutlet UILabel *username;
@property (weak, nonatomic) IBOutlet UILabel *captiontext;

当用户点击UICollectionViewCell时，我尝试设置详细视图控制器的显示，如下所示： - （void）collectionView：（UICollectionView *）collectionView didSelectItemAtIndexPath：（NSIndexPath *）indexPath {

NSDictionary *entry = [self entries][indexPath.row];
NSDictionary *text = [self entries][indexPath.row];

ModalViewController *m = [self.storyboard instantiateViewControllerWithIdentifier:@"modalView"];
m.entry = [self entries][indexPath.row];
m.text = [self entries][indexPath.row];
m.user = entry[@"user"][@"full_name"];
m.caption = text[@"caption"][@"text"];

MZFormSheetController *formSheet = [[MZFormSheetController alloc] initWithViewController:m];
formSheet.transitionStyle = MZFormSheetTransitionStyleDropDown;
formSheet.shouldDismissOnBackgroundViewTap = YES;
[formSheet presentAnimated:YES completionHandler:^(UIViewController *presentedFSViewController) {

}];
formSheet.didTapOnBackgroundViewCompletionHandler = ^(CGPoint location)
{

};

}

我在storyalviewcontroller的storyboard中创建了两个标签，我尝试使它们等于MainViewController中的标题和用户值，如下所示

[self.username.text isEqualToString:self.user];
[self.captiontext.text isEqualToString:self.caption];

然而，在所有这些之后，模态视图控制器的标签仍然说像这样的标签..

Answer 1

您的标签未更新为正确的值，因为-isEqualToString:方法用于测试两个NSString是否相等，并且它实际上并未设置任何NSString的值。如果要为字符串变量赋值，则执行与分配任何其他变量相同的值。因此，为了正确设置标签，您只需要分配UILabel s的text属性，如下所示：

self.username.text = self.user;
self.captiontext.text = self.caption;

Answer 2

您是否在viewDidLoad方法中的ModalViewController中设置了username和captiontext？在故事板初始化之后，所有IBOutlet都是零，你需要在viewDidLoad中设置。

- (void)viewDidLoad 
{
   [super viewDidLoad];

   self.username.text = self.user;
   self.captiontext.text = self.caption;
}