xcode 标签栏控制器（故事板模板）和 AppDelegate
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Tab Bar Controller (storyboard template) and AppDelegate
提问by ingenspor
When I create a XCode 4 iPhone template for TabBarController with storyboard, its automaticly configured with a main view controller and everything. But there is no propery for the Tab Bar Controller in the AppDelegate. Can I created an outlet for it, and tryed to link it with my Tab Bar Controller in storyboard but that's not possible. Is there a better way to access the Tab Bar Controller in didFinishLaunchingWithOptions method, as it's already kind of hooked up? What I want is self.currentController = current tab in Tab Bar Controller.
当我为带有故事板的 TabBarController 创建 XCode 4 iPhone 模板时，它会自动配置一个主视图控制器和所有内容。但是 AppDelegate 中的 Tab Bar Controller 没有属性。我可以为它创建一个插座，并尝试将它与故事板中的 Tab Bar Controller 链接，但这是不可能的。有没有更好的方法来访问 didFinishLaunchingWithOptions 方法中的 Tab Bar Controller，因为它已经连接上了？我想要的是 self.currentController = 标签栏控制器中的当前标签。
AppDelegate.h:
AppDelegate.h：
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end
AppDelegate.m:
AppDelegate.m：
@interface AppDelegate()
@property (nonatomic, assign) UIViewController<SubViewContainer> *currentController;
@end
@synthesize window = _window
@synthesize currentController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//I need this piece of code to equal the Tab Bar Controller current tab
self.currentController = ?
return YES;
}
//And I'm gonna use this void for some statements about the Tab Bar Controller tabs:
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:
(UIViewController *)viewController
{
// with some statements
}
回答by Phillip Mills
Assuming things are set up in your storyboard as expected, this should give you a reference to the tab bar controller in didFinishLaunchingWithOptions::
假设您的故事板中的内容按预期设置，这应该为您提供对标签栏控制器的参考didFinishLaunchingWithOptions:：
NSLog(@"Root: %@", self.window.rootViewController);
UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;
Usually, you could get the current controller using...
通常，您可以使用...
self.currentController = [tabController selectedViewController];
...but since no controller has been selected at the time this method executes, the best guess of what you want is...
...但是由于在此方法执行时尚未选择任何控制器，因此您想要的最佳猜测是......
self.currentController = [[tabController viewControllers] objectAtIndex:0];
回答by The Kraken
Use self.window.rootViewController.tabBarControllerto gain access to that view controller's tab bar controller.
用于self.window.rootViewController.tabBarController访问该视图控制器的标签栏控制器。
