iOS storyboard传递数据navigationViewController [英] iOS storyboard passing data navigationViewController

问题描述

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我 performSegueWithIdentifier 与两个segue标识符之一，然后在我想传递数据到ViewController称为稳定或Oddzialy。

传递数据代码：

   - （void）prepareForSegue： UIStoryboardSegue *）segue sender：（id）sender 
 {
 if（[[segue identifier] isEqualToString：@sLogowanieFirmy]）{
 FirmyVC * firmyVC = [segue destinationViewController]; 
 firmyVC.tabFirmy = self.tabFirmy; 
} 
 if（[[segue identifier] isEqualToString：@sLogowanieOddzialy]）{
 OddzialyVC * oddzialyVC = [segue destinationViewController]; 
 oddzialyVC.wybranaFirma = [self.tabFirmy objectAtIndex：0]; 
} 
} 
  

问题是使用方法 [segue destinationViewController] segue destinationViewController for segue是NavigationViewController。

那么什么是传递数据和具有独立导航控制器的正确方法？

解决方案

UINavigationController 有一个名为 topViewController 的属性，返回位于堆栈顶部的视图控制器。

因此，您的 prepareForSegue：方法可能如下所示：

   - （void）prepareForSegue：（UIStoryboardSegue *）segue sender：（id）sender 
 {
 if [[segue identifier] isEqualToString： @sLogowanieFirmy]）{
 UINavigationController * nav = [segue destinationViewController]; 
 FirmyVC * firmyVC =（FirmyVC *）nav.topViewController; 
 firmyVC.tabFirmy = self.tabFirmy; 
} 
 
 // etc ... 
} 
  

I have problem with proper passing data between view's but not in standard way.

Picture describing my problem:

I performSegueWithIdentifier with one of two segue identifiers and then in I want to pass data to ViewController called "Firmy" or "Oddzialy".

Passing data code:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
  if ([[segue identifier] isEqualToString:@"sLogowanieFirmy"]) {
      FirmyVC *firmyVC = [segue destinationViewController];
      firmyVC.tabFirmy = self.tabFirmy;
  }
  if ([[segue identifier] isEqualToString:@"sLogowanieOddzialy"]) {
      OddzialyVC *oddzialyVC = [segue destinationViewController];
      oddzialyVC.wybranaFirma = [self.tabFirmy objectAtIndex:0];
  }
}

Problem is with method [segue destinationViewController] becouse destinationViewController for segue is NavigationViewController.

So what is proper way to pass data and have independent Navigation Controllers?

解决方案

UINavigationController has a property called topViewController which returns the view controller that is at the top of the stack.

So your prepareForSegue: method may look something like this...

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"sLogowanieFirmy"]) {
        UINavigationController *nav = [segue destinationViewController];
        FirmyVC *firmyVC = (FirmyVC *)nav.topViewController;
        firmyVC.tabFirmy = self.tabFirmy;
    }

    // etc...
}

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