如何确定哪个tabbar索引是我的视图控制器 [英] how to determine which tabbar index is my view controller

问题描述

有人可以告诉我如何确定视图控制器在哪个tabbar索引。

以简化 - 我可以跳到一个tabBarItem的时候，通过硬编码其指数。

  self.tabBarController.selectedIndex = 3;但是，如果用户自定义选项卡栏项目，则有可能是viewController在数字3处是n（n）。是用户在移动时所需要的。我如何确定它移动到哪里，以便我可以选择正确的。
 
 
 
任何帮助。
 
 
 
感谢，
 
 
 
李
解决方案
运气与任何任何答案成功 - 但我确实排序它，所以我想解释我是怎么做，因为有其他人谁卡住试图做我做了什么。
 
 
 
我的标签栏控制器上的每个tabBarItem都分配了一个以0开头并以8结尾的标签。（也可以在IB中完成）
 
 
 
对于tabBarController等的委托是所有设置和补充以下委托方法：
   - （void）tabBarController：（UITabBarController *）theTabBarController didEndCustomizingViewControllers ：（NSArray *）viewControllers changed：（BOOL）changed {
 
 NSInteger count = self.tabBarController.viewControllers.count; 
 NSMutableArray * tabOrderArray = [[NSMutableArray alloc] initWithCapacity：count]; 
 
 
（UINavigationController * viewController in viewControllers）
 {
 NSInteger tag = viewController.tabBarItem.tag; 
 [tabOrderArray addObject：[NSNumber numberWithInteger：tag]]; 
} 
 
 [prefs setObject：tabOrderArray forKey：@tabOrder]; 
 [prefs synchronize]; // optional 
 [tabOrderArray release]; 
  
} 
 
 
 
（注意我使用navControllers我的应用程序中的ViewControllers的ontop因此for循环）
 
 
 
所以现在我能做的只是做一个检查，如果有一个数组在prefs与新标签bar order 
  NSArray * tabBarOrder = [prefs objectForKey：@tabOrder]; 
 
 
 if（tabBarOrder）{...} 
  
如果有一个标签栏顺序我可以得到索引的VC我想要的[[tabBarOrder indexOfObjectIdenticalTo：[NSNumber numberWithInt：theViewsTagImAfter]]; 
 
 
 
如果没有数组in prefs你可以放心地假设它没有移动，在哪里。
 
 
 
 ** 
 
 
 
一个人自由地破坏我是如何做到这一点，如果你觉得你可以以更时尚的方式完成这一点。然而，这工作和其他建议did not。
 
Can somebody please tell me how I can determine which tabbar index a view controller is at.

to simplify - I can jump to a tabBarItem at the moment by hardcoding its index. 
self.tabBarController.selectedIndex = 3;
However, should the user customize the tab bar items, there is a possibility the viewController at number 3 isn't the one that the user will want as it has been moved. How can I determine where it has moved to so I can select the correct one.

Any help please.

Thanks,

Lee
解决方案
ok, so I had no luck with any of any of the answers successfully - but I did sort it so thought I would explain how I did it incase there is someone else who gets stuck attempting to do what I did.

each tabBarItem on my tab bar controller was assigned a tag that started with 0 and say ended with 8. (can be done in IB also)

make sure delegate for tabBarController etc is all set and inplement the following delegate method:
- (void)tabBarController:(UITabBarController *)theTabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed {

NSInteger count = self.tabBarController.viewControllers.count;
NSMutableArray *tabOrderArray = [[NSMutableArray alloc] initWithCapacity:count];


for (UINavigationController *viewController in viewControllers)
{
    NSInteger tag = viewController.tabBarItem.tag;
    [tabOrderArray addObject:[NSNumber numberWithInteger:tag]];
}

[prefs setObject:tabOrderArray forKey:@"tabOrder"];
[prefs synchronize]; // optional
[tabOrderArray release];
}

(note i use navControllers ontop of ViewControllers in my app hence that for loop)

so now what i was able to do was simply do a check if there was an array in prefs with a new tab bar order
NSArray * tabBarOrder = [prefs objectForKey:@"tabOrder"];


if(tabBarOrder) { ... }
if there was a tab bar order i could get index of the VC i wanted with '[tabBarOrder indexOfObjectIdenticalTo:[NSNumber numberWithInt:theViewsTagImAfter]];

and if there was no array in prefs you can safely assume it hasn't moved and is where is.

**

Any one feel free to destroy how I have done this should you feel you could have accomplished this in a sleeker way. however, this works and the other suggestions didnt.

                        
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