ios - 如何将值传递给另一个 UINavigationViewController

Question

我有一个 UIViewController，我必须将一个值（UIImage，NSString）传递给我正在使用的 UINavigationViewController

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    AppDetail *advc = [segue destinationViewController];
    if ([[segue identifier] isEqualToString:@"showDetail"]) {
        advc.appTitel = name;
        advc.appIcon = icon;
        advc.detailAppName = detileName;
        advc.appDescription = description;
        advc.appDeveloper = developer;
    }
}

将值传递给UIViewController，如果我直接将它传递给 a ，它可以完美地工作UIViewController，但我不能将它传递给 a UINavigationViewController，有人知道我该怎么做吗？

Answer 1

我有来自 Apple segue 示例的示例代码。也许它有帮助。

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"Room Create"]) {
        // Prepare the settings view where the user inputs the 'serviceType' and local peer 'displayName'
        UINavigationController *navController = segue.destinationViewController;
        SettingsViewController *viewController = (SettingsViewController *)navController.topViewController;
        viewController.delegate = self;
        // Pass the existing properties (if any) so the user can edit them.
        viewController.displayName = self.displayName;
        viewController.serviceType = self.serviceType;
    }
} 

Answer 2

要在您的情况下使用 UINavigationController 传递值Segue，请尝试以下代码：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"]) 
    {
        UINavigationController *navController = (UINavigationController *)segue.destinationViewController;
        AppDetail *advc = (AppDetail *)navController.topViewController;

        advc.appTitel = name;
        advc.appIcon = icon;
        advc.detailAppName = detileName;
        advc.appDescription = description;
        advc.appDeveloper = developer;
    }
}

如果您不使用 UINavigationController，则需要使用以下代码：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"]) {

       // Get reference to the destination view controller
        AppDetail *advcc = segue.destinationViewController;

        advc.appTitel = name;
        advc.appIcon = icon;
        advc.detailAppName = detileName;
        advc.appDescription = description;
    }
}