在导航堆栈中传递变量?- 苹果手机 [英] Pass a Variable Up the Navigation Stack? - iPhone

问题描述

通过将其视图控制器推到导航堆栈上，我能够将变量从视图控制器传递到视图控制器.我的操作方式示例如下:

I am able to pass a variable forward from view controller to view controller by pushing its view controller onto the navigation stack. An example of how I do it would be this:

MyViewController *controller = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
controller.myString = stringToPass;
[self.navigationController pushViewController:controller animated:YES];
[controller release];

但是，如果我想传递一个变量到导航堆栈上怎么办?使用popViewControllerAnimated而不是pushViewController不会像我想的那样传递变量.

However, what do I do if I want to pass a variable BACK UP the navigation stack? Using popViewControllerAnimated rather than pushViewController does not pass the variable up like I thought it would.

我需要能够从定义它的视图控制器中访问几个弹出的变量.

I need to be able to access the variable several pops up from the view controller it is defined in.

任何帮助将不胜感激:)

Any help will be greatly appreciated :)

推荐答案

您正在传递值，而不是变量.

You're passing values, not variables.

视图控制器不应自行弹出.使用Apple的视图控制器(例如，UIImagePicker)，父视图控制器负责执行弹出操作；父VC也可以获取当前值.(并非完全正确；在应用键盘自动补全功能之前，它可能会访问该值)

A view controller should not be responsible for popping itself. With Apple's view controllers (e.g. UIImagePicker), it is the parent view controller's responsibility to do the popping; the parent VC can also obtain the current value. (Not entirely correct; it might access the value before a keyboard autocompletion is applied)

或者，如果它是一个可以全局共享的值，则可以将其存储在应用程序委托中.

Alternatively, if it's a value that can be shared globally, you can store it in your application delegate.

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