如何在iOS上以编程方式创建选项卡视图 [英] How can I create a tab view programmatically on iOS

问题描述

对于iPhone应用程序，我如何以编程方式(最好是在Objective-C中)创建选项卡视图?

For an iPhone app how can I create a tab view programmatically, preferably in Objective-C?

推荐答案

通过

It's quite simple to create a UITabBar via the UITabBarController. The following example should work within your AppDelegate class.

应用程序代理界面

首先，在界面中，我们将定义 UITabBarController .

Firstly, within the interface, we'll define our UITabBarController.

UITabBarController *tabBarController;

应用代理实现

然后，在实现文件的application:didFinishLaunchingWithOptions:方法中，我们将初始化标签栏控制器.

Then, within the implementation file's application:didFinishLaunchingWithOptions: method, we'll then initialise our tab bar controller.

// Initialise our tab bar controller
UITabBarController *tabBarController = [[UITabBarController alloc] init];

接下来，您需要创建要添加到选项卡栏控制器的视图控制器.我们需要在其中添加一些信息来设置标签的标题/图标，但最后我将再次介绍.

Next, you need to create the view controllers that you want to add to the tab bar controller. We'll need to add some information into these to set the tab's title/icon, but I'll come back to that at the end.

// Create your various view controllers
UIViewController *testVC = [[TestViewController alloc] init];
UIViewController *otherVC = [[OtherViewController alloc] init];
UIViewController *configVC = [[ConfigViewController alloc] init];

由于setViewControllers:animated:方法需要一个视图控制器数组，因此我们将视图控制器添加到数组中，然后释放它们. (因为NSarray将保留它们.)

As the setViewControllers:animated: method requires an array of view controllers, we'll add our view controllers to an array and then release them. (As the NSarray will retain them.)

// Put them in an array
NSArray *viewControllers = [NSArray arrayWithObjects:testVC, otherVC, configVC, nil];
[testVC release];
[otherVC release];
[configVC release];

然后只需为UITabBarController提供视图控制器数组并将其添加到我们的窗口中即可.

Then simply provide the UITabBarController with the array of view controllers and add it to our window.

// Attach them to the tab bar controller
[tabBarController setViewControllers:viewControllers animated:NO];

// Put the tabBarController's view on the window.
[window addSubview:[tabBarController view]];    

最后，请确保您在dealloc方法中调用[tabBarController release];.

Finally, make sure you call [tabBarController release]; within your dealloc method.

View Controller实施

在每个视图控制器中，您还需要按如下所示在init方法中设置选项卡的标题和图标:

Inside each of your view controllers, you'll also want to set the title and icon for the tab within the init method as follows:

// Create our tab bar item
UITabBarItem *tabBarItem = [self tabBarItem];
UIImage *tabBarImage = [UIImage imageNamed:@"YOUR_IMAGE_NAME.png"];
[tabBarItem setImage:tabBarImage];
[tabBarItem setTitle:@"YOUR TITLE"];

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