从AppDelegate向ViewController上的属性添加值

时间:2014-07-10 21:23:55

标签: ios objective-c uiviewcontroller appdelegate

我有以下代码:

UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
[tabBarController performSegueWithIdentifier:@"push_display_incomming_call" sender:self];

这显示了我想要正确看到的ViewController。但是现在我想在显示之前更改属性的ViewController的值是Segue,我正在尝试以下但没有成功。

incommingCallViewController *mainController = (incommingCallViewController*) tabBarController;
            mainController.name.text = @"Eddwn Paz";

这是来自xCode控制台的堆栈跟踪:

2014-07-10 16:46:09.413 mobile-app[9354:60b] -[OptionsTabBarViewController name]: unrecognized selector sent to instance 0x17552540
2014-07-10 16:46:09.414 mobile-app[9354:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[OptionsTabBarViewController name]: unrecognized selector sent to instance 0x17552540'

1 个答案:

答案 0 :(得分:2)

假设push_display_incomming_call segue将IncommingCallViewController视图控制器显示为模态。所以你应该使用代码:

IncommingCallViewController *callVC = 
    (IncommingCallViewController *)tabBarController.presentedViewController;
callVC.name.text = @"Eddwn Paz";

<强>说明:

您收到错误是因为您尝试将tabBarController用作incommingCallViewController的实例,而它是[{1}}的实例,因此它没有必需的UITabBarController属性。