[英]How can you set a property of a UIViewController that is about to load in a UITabBarController?
I'm loading up a UITabBarController via a Storyboard as follows: 我正在通过情节提要加载UITabBarController,如下所示:
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"EventsAdmin" bundle:nil];
[self.navigationController pushViewController:[sb instantiateInitialViewController] animated:YES];
The initial view controller is the uitabbarviewcontroller however I'd like to set a property on each of the view controllers that is loaded. 初始视图控制器是uitabbarviewcontroller,但是我想在每个加载的视图控制器上设置一个属性。 How can I do this?
我怎样才能做到这一点?
You can achieve this the following way: 您可以通过以下方式实现:
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"EventsAdmin" bundle:nil];
id vc = [sb instantiateInitialViewController];
[self.navigationController pushViewController: vc animated: YES];
if ([vc isKindOfClass: [UITabBarController class]])
{
for (UIViewController *controller in [(UITabBarController *)vc viewControllers])
{
// set your property
}
}
In the loop you should check if controller is an instance of the view controller class you want to modify the property of. 在循环中,应检查controller是否是要修改其属性的视图控制器类的实例。
Or.. You could declare a protocol and give these modal viewControllers a property of type 或者..您可以声明一个协议,并为这些模式viewControllers提供类型的属性
`IBOutlet id <myProtocol> delegate
And hook these up to the root view controller in the storyboard. 并将它们连接到情节提要中的根视图控制器。 Then the modal viewControllers can query the delegate from their viewWillAppearAnimated: Then in your rootViewController you'll have (as part of myProtocol) a
然后,模态viewController可以从其viewWillAppearAnimated中查询委托:然后在您的rootViewController中,您将拥有一个(作为myProtocol的一部分)
-(void)setMyStuffUp:(UIViewController *)modalViewcontroller{
if ([modalViewController isKindOfClass:[viewControllerOne class]]){
//set stuff
}elseIf ( etc == etc){
//setOtherStuff..
}
}
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