在app Delegate中使用pushViewController

Question

您好，我想在app delegate

中使用此代码

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


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

如何从appdelegate推送viewcontroller 我的意思是使上面的代码工作 cuz self.navigationcontroller不起作用：$

Answer 1

在委托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];
}

现在使用您想要的UIViewController中的委托对象调用该函数，

[appDelegateObject pushViewControllerFrom:self];

请注意， 您可以像这样创建appDelegateObject，

#import "AppDelegate.h"

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