ios - 在 app Delegate 中使用 pushViewController

Question

你好，我想在应用委托(delegate)中使用这段代码

  ChatController *chatController = [[AppDelegate appDelegate] instantiateViewControllerWithIdentifier:@"GroupController"];
                                            chatController.targetUserid = userid;


                                         [self.navigationController pushViewController:groupChatController animated:YES];

我如何从 appdelegate 推送 viewcontroller我的意思是让上面的代码工作因为 self.navigationcontroller 不工作:$

Answer 1

在您的委托(delegate)文件中编写并定义此函数，

- (void)pushViewControllerFrom:(UIViewController*)controller {
    ChatController *chatController = [[AppDelegate appDelegate] instantiateViewControllerWithIdentifier:@"GroupController"];
                                        chatController.targetUserid = userid;
    [controller.navigationController pushViewController:groupChatController animated:YES];
}

现在从您想要的 UIViewController 中使用您的委托(delegate)对象调用该函数，

[appDelegateObject pushViewControllerFrom:self];

请注意，您可以像这样创建 appDelegateObject，

#import "AppDelegate.h"

AppDelegate *appDelegateObject = (AppDelegate *)[UIApplication sharedApplication].delegate;