Question

如果NSLog destinationviewcontroller像这样，我试图收到简单的isKindOfClass消息：

FirstViewController.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.destinationViewController isKindOfClass:[SecondViewController class]]) {

        NSLog(@"The destinationViewController isKindOfClass SecondViewController");
}

在故事板中，我按住Ctrl +从FirstViewController中的条形按钮项目拖动到SecondViewController并选择模态segue。我还确保#import SecondViewController.h FirstViewContrller.m中的SecondViewController，我已经给了SecondViewController＆＃34;自定义类＆＃34;身份检查员中的NSLog。

我是否需要添加/执行其他操作，因为我此时未收到{{1}}消息。

编辑：我忘了告知我确实将secondViewController嵌入了navigationViewController中。

Answer 1

这应该适合你：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    UINavigationController *navigationController = segue.destionationViewController;

    if ([navigationController.viewControllers[0] isKindOfClass:[SecondViewController class]]) {

        NSLog(@"The destinationViewController isKindOfClass SecondViewController");
}

但如果你想要更通用的东西，我会这样做：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    id dvc = segue.destinationViewController;
    if ([dvc isKindOfClass:[UINavigationController class]] && ((UINavigationController *)dvc).viewControllers > 0) {
        dvc = [[dvc viewControllers] firstObject];
    }

    NSLog(@"The destinationViewController is: %@", NSStringFromClass([dvc class]));
}

Answer 2

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{  
    HomeViewController *edit=[segue destinationViewController];  
    if ([HomeViewController.viewControllers[0] isKindOfClass:[CheckViewController class]])       
    {

             //You are ready for coding here

    }

}

试试这段代码。这可能有所帮助。

Answer 3

首先，您必须设置destinationViewController

 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
       {

             if([segue.identifier isEqualToString:@"YourSegueIdentifierHere"] )
             {
                  //Now you can assign here the destinationViewController
                SecondViewController *secondController = [segue  destinationViewController];

                   //now you don't need this but if you want you can
                  if([segue.destinationViewController isKindOfClass:[SecondViewController class]])

                  {
                         NSLog(@"The destinationViewController isKindOfClass SecondViewController");
                  }




             }

}

您可以使用[segue.destinationViewController isKindOfClass:[SecondViewController class]]

如果你愿意，可以在if语句中使用。但是现在你不需要从你的xcode中获取标识符。

我如何获得segue.destinationViewController isKindOfClass：x，以识别目标类？

3 个答案: