如何使用UINavigationController在视图之间传递数据 [英] How do you pass data between views using a UINavigationController

问题描述

我已尝试使用下面示例中列出的显而易见的方法，但在加载视图中的viewDidLoad上，我传递的变量（ rootcategory ）仍然为 nil

http ：//www.iphonesdkarticles.com/2008/08/table-view-tutorial-part-3.html

这是我的代码：

  CategoryViewController * viewController = [[CategoryViewController alloc] initWithNibName：@CategoryViewControllerbundle：[NSBundle mainBundle] 
 self.categoryViewController.rootCategory = @433; 
 self.categoryViewController = viewController; 
 [viewController release]; 
  

我在标题中合成一个属性如下：

  @property（nonatomic，readwrite）NSString * rootCategory; 
  

解决方案

您正在分配viewController，

  CategoryViewController * viewController = [[CategoryViewController alloc] initWithNibName：@CategoryViewControllerbundle： NSBundle mainBundle]]; 
 viewController.rootCategory = @433; 
 self.categoryViewController = viewController; 
 [viewController release]; 
  

应该可以正常工作。

I have tried using the obvious method as outlined in the following example but my passed variable (rootcategory) is still nil on viewDidLoad in the loaded view

http://www.iphonesdkarticles.com/2008/08/table-view-tutorial-part-3.html

This is my code:

CategoryViewController *viewController = [[CategoryViewController alloc] initWithNibName:@"CategoryViewController" bundle:[NSBundle mainBundle]];
self.categoryViewController.rootCategory = @"433";
self.categoryViewController = viewController;
[viewController release];

I am synthesizing a property in the header as follows:

@property (nonatomic, readwrite) NSString *rootCategory;

解决方案

You are allocating viewController, and try to change self.categoryViewController before it is assigned to viewController.

CategoryViewController *viewController = [[CategoryViewController alloc] initWithNibName:@"CategoryViewController" bundle:[NSBundle mainBundle]];
viewController.rootCategory = @"433";
self.categoryViewController = viewController;
[viewController release];

should work.

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