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我在尝试将联系人(loggedinUser)的信息传递给destinationViewControllers的联系人(currentUser)时创建了一个segue,但由于某种原因它没有通过。下面的代码有问题吗?

原图:

...
self.loggedInUser.firstName = @"first name";
self.loggedInUser.lastName = @"last name";
self.loggedInUser.company = @"company"
self.loggedInUser.position = @"position";
[self performSegueWithIdentifier:@"profileSegue" sender:self];
...

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
ProfileViewController *pvc = (ProfileViewController *) [segue destinationViewController];
pvc.currentUser = self.loggedInUser; }

然后我在 DestinationViewController 的标签中显示值:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSString *fullName = [NSString stringWithFormat:@"%@ %@", currentUser.firstName, currentUser.lastName];
    fullNameLabel.text = fullName;
    companyLabel.text = currentUser.company;
    positionLabel.text = currentUser.position;
}

loggedInUser 和 currentUser 都属于“Contact”类型。但标签最终显示为空。我错过了一些明显的东西吗?

编辑

这是 self.loggedinUser 没有被传递给 prepareForSegue 的问题。

标头代码:

#import "Contact.h"

@interface LoginViewController : UIViewController
{
}

...

@property (nonatomic, retain) Contact *loggedInUser;
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1 回答 1

1

我假设viewDidLoad之前被调用过prepareFortSegue,即当currentUser仍然是nil。我建议将您的代码viewDidLoadviewWillAppear. 或者您可以设置断点来检查调用顺序。

于 2013-08-22T05:04:10.017 回答