xcode tabBar didSelectItem 似乎不起作用
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10946058/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
tabBar didSelectItem seems not to be working
提问by Rowie Po
In my header file I have this:
在我的头文件中，我有这个：
@interface TabBarController : UIViewController <UIApplicationDelegate, UITabBarDelegate, UITabBarControllerDelegate>{
IBOutlet UITabBarController *tabBarController;
}
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@end
In my main file I have this:
在我的主文件中，我有这个：
@synthesize tabBarController;
-(void)viewDidLoad{
[super viewDidLoad];
self.tabBarController.delegate = self;
self.view = tabBarController.view;
}
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
NSLog(@"rawr");
}
- (void)viewDidUnload {
[super viewDidUnload];
}
- (void)dealloc {
[tabBarController release];
[super dealloc];
}
@end
I have already connected my tabbarcontrolleras a delegate to my file's owner in interface builder, but it still never calls the didSelectItemmethod.
我已经tabbarcontroller在界面构建器中将my作为委托连接到我的文件所有者，但它仍然从未调用该didSelectItem方法。
Is there anything that I'm missing here?
有什么我在这里想念的吗？
I have already added tabBarController.delegate = self;and it still does not work.
我已经添加了tabBarController.delegate = self;，还是不行。
回答by idearibosome
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item;
This method is a delegate method for UITabBar, not UITabBarController, so
这个方法是UITabBar的委托方法，不是UITabBarController，所以
self.tabBarController.delegate = self;
will not work.
不管用。
Tab bar controller has its own UITabBar, but changing the delegate of a tab bar managed by a tab bar controller is not allowed, so just try UITabBarControllerDelegate method like this:
标签栏控制器有自己的 UITabBar，但是不允许更改标签栏控制器管理的标签栏的委托，因此只需尝试 UITabBarControllerDelegate 方法，如下所示：
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
回答by iOSDev
You need to add this:
你需要添加这个：
tabbarcontroller.delegate = self;
回答by Sameera R.
Use UITabBarControllerDelegateinstead of UITabBarDelegateand-tabBarController:didSelectViewController{}instead of tabBar:didSelectItem{}
使用UITabBarControllerDelegate代替UITabBarDelegate和-tabBarController:didSelectViewController{}代替tabBar:didSelectItem{}
Interface
界面
@interface TabBarController : UIViewController <UIApplicationDelegate, UITabBarControllerDelegate, UITabBarControllerDelegate>{
IBOutlet UITabBarController *tabBarController;
}
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@end
main file
主文件
@implementation TabBarController
@synthesize tabBarController;
/*other stuff*/
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
NSLog(@"rawr");
}
/*other stuff*/
@end
回答by Tal Shumski
You have synthesized the tab bar, so you now need to write: self.tabBarController.delegate = self;
你已经合成了标签栏，所以你现在需要写： self.tabBarController.delegate = self;
回答by Andrea
Just set the delegate for the tab bar. You can do it by setting self.tabBarController.delegate = self;or using Interface builder do to the tabbarcontroller object (not bar) see the connection inspector and drag the connection on the file's owner.
只需为标签栏设置委托。您可以通过self.tabBarController.delegate = self;对 tabbarcontroller 对象（不是 bar）设置或使用 Interface builder do 来实现，查看连接检查器并拖动文件所有者上的连接。
回答by Ray Fix
There are many reasons, as indicated above, why it might not be working. Here is a more subtle reason. If you are creating your UI programatically (no storyboard or Xib) you need to set the screen of your UIWindow.
如上所述，它可能不起作用的原因有很多。这是一个更微妙的原因。如果您以编程方式创建 UI（没有故事板或 Xib），则需要设置 UIWindow 的屏幕。
self.window = [[UIWindow alloc] init];
self.window.screen = [UIScreen mainScreen]; // <- The UITabViewController will not
// accept taps without this.
If you are using a Xib, I believe this is equivalent to having "Full Screen at Launch" selected. That has to be checked or I have noticed my Tabs don't work.
如果您使用的是 Xib，我相信这相当于选择了“启动时全屏”。必须检查，否则我注意到我的标签不起作用。
Update:Whatever, down-vote me if you must but I had a non-working tab controller and this is what I had to do to get it working. None of the other answers on this page helped me. I suppose using a xib/storyboard is pretty rare these days (I think this was from iOS 5 days) but leaving here for the person that does and stumbles into this situation.
更新：无论如何，如果必须的话，请给我投反对票，但我有一个无法正常工作的选项卡控制器，这是我必须做的才能使其正常工作。此页面上的其他答案都没有帮助我。我想这些天使用 xib/storyboard 非常罕见（我认为这是从 iOS 5 天开始的）但是离开这里的人会遇到这种情况。
