将数据从视图控制器传递到iOS中的标签栏控制器

问题描述：

我正在开发一款iOS应用，现在我很茫然。我正在尝试将数据从第一个View Controller传递到TabBarViewController的第一个选项卡（使用storyboard）。我找到了许多教程来解释如何在视图控制器之间传递数据，但是我的标签栏没有任何效果。我知道标签栏控制器包含一种视图数组。视图控制器和标签栏控制器之间的关系使用segue（推送）实现。所以，我认为使用prepareForSegue（）方法很容易。像那样：

I'm developing an iOS app and now I'm at a loss. I'm trying to pass data from the first View Controller to the first tab of a TabBarViewController (with using the storyboard). I found a lot of tutorials that explain how to pass data between view controllers, but nothing worked with my tab bar. I know that the tab bar controller contains a kind of array of views. The relation between the View Controller and the Tab Bar Controller is realized using a segue (push). So, I thought it is easy to use the prepareForSegue() - method. Like that:

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

 // ...

    } 
 }

不幸的是，标签栏控制器和每个标签栏视图之间的关系不是真正的segue。这只是一种关系。这意味着，我没有能够用于上述方法的segue标识符。在这种情况下是否有可能使用prepareForSegue？如果没有，任何想法如何解决这个问题？我知道有一个类似的问题，但答案并没有那么有用。我是否必须为标签栏控制器中的每个选项卡（视图）创建新文件？或者是否可以为整个标签栏控制器设置一个类（m。& h。），使用objectAtIndex（）访问多个视图？

Unfortunately, the relation between the Tab Bar Controller and each tab bar view is no real segue. It's only a "relationship". That means, there is no segue identifier I am able to use for the the method above-mentioned. Is there a possibility to use the prepareForSegue in this case? If not, any ideas how to solve this problem? I know that there is a similar question, but the answer wasn't that helpful. Do I have to create a new file for every tab (view) within the tab bar controller? Or is it possible to have one class (m. & h.) for the whole tab bar controller, accessing the several view with objectAtIndex()?

提前感谢！

答

这是我的设置有效：

设置Segue：

Setup Segue:

设置视图控制器，带有segue到标签栏控制器，故事板中有2个子视图控制器

指定segue标识符（标签）

Setup View Controller with segue to Tab Bar Controller with 2 child View Controllers in Storyboard
Specify segue identifier (tab)

故事板中的设置类：

Setup Classes in Storyboard:

View Controller class = ViewController

Tab Bar Controller class = TabBarController

标签栏控制器子视图控制器类= TabsViewController （两者共享）

View Controller class = ViewController
Tab Bar Controller class = TabBarController
Tab Bar Controller Child View Controller class = TabsViewController (shared between both)

设置 labelString 标签栏控制器中的属性：

Setup labelString property in Tab Bar Controller:

在 TabBarController.h ：

@property (nonatomic, strong) NSString *labelString;

在 TabBarController.m 中：

@synthesize labelString;

设置 prepareForSegue 中的方法ViewController.m ：

#import "TabBarController.h"

...

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if ([[segue identifier] isEqualToString:@"tab"]){
        TabBarController *tabBar = [segue destinationViewController];
        [tabBar setLabelString:[NSString stringWithFormat:@"This has been set"]];
    }
}

设置 UILabel 用于子选项卡栏视图控制器。

Setup UILabels for Child Tab Bar View Controllers.

将默认 UILabel 控件拖到两个子视图控制器中

在中创建属性TabsViewController.h ：

Drag default UILabel controls into both child View Controllers
Create property in TabsViewController.h:

@property (nonatomic, strong) IBOutlet UILabel *label;

挂钩 5.1 和 5.2 在故事板中

设置 ViewDidLoad 中的方法TabsViewController.m ：

#import "TabBarController.h"

...

@synthesize label;

...

- (void)viewDidLoad
{
    [super viewDidLoad];

    TabBarController *tabBar = (TabBarController *)self.tabBarController;
    label.text = [NSString stringWithFormat:@"Tab %i: %@",[tabBar.viewControllers indexOfObject:self],tabBar.labelString];
}

现在点击第一个和第二个标签将显示标签标签0：已设置和标签1：已设置分别。

Now clicking on the 1st and 2nd tabs will have the labels display Tab 0: This has been set and Tab 1: This has been set, respectively.

将数据从视图控制器传递到iOS中的标签栏控制器

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