objective-c - 关闭模态视图 Controller 后呈现不同的 View Controller

Question

我为 iOS 应用程序中的各种 UI 设置提供了一个模态视图 Controller 。其中一个设置允许用户选择不同的主视图。当他们点击“完成”时，我想关闭模态视图并显示新选择的 View Controller ，而不会在旧 View Controller 切换到新 View Controller 时出现短暂延迟。如何实现？

更新:

这是我使用 Eugene 的技术成功实现的方法，但没有应用程序委托(delegate)。相反，此实现特定于我的场景，其中导航堆栈中的 View Controller 在实用程序应用程序中呈现模态视图 Controller 。

- (void)swapFrontSideViewController;
{
    UINavigationController *navigationVC = (UINavigationController *)[self presentingViewController];
    NSMutableArray *viewControllers      = [NSMutableArray arrayWithArray:navigationVC.viewControllers];
    UIViewControllerSubclass *selectedViewController = nil;
    if ([self.selectedFrontSide isEqualToString:FRONT_SIDE_NAME1]) {
        selectedViewController = [self.storyboard instantiateViewControllerWithIdentifier:FRONT_SIDE_NAME1];
    } else if ([self.selectedFrontSide isEqualToString:FRONT_SIDE_NAME2]) {
        selectedViewController = [self.storyboard instantiateViewControllerWithIdentifier:FRONT_SIDE_NAME2];
    }
    if (selectedViewController) {
        [viewControllers replaceObjectAtIndex:viewControllers.count -1 withObject:selectedViewController];
        [navigationVC setViewControllers:viewControllers];
        self.delegate = selectedViewController;
    } else {
        NSLog(@"Error: Undefined Front Side Selected.");
    }
}

Answer 1

- (IBAction)doDismiss:(id)sender {
  AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate; // Get the app delegate
  NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:appDelegate.navigationController.viewControllers]; // fetch its navigationController viewControllers stack
  UIViewController *replacementController; //initialize replacement controller
  [viewControllers replaceObjectAtIndex:viewControllers.count -1 withObject:replacementController]; // replace the top view controller in stack with the replacement one
  [appDelegate.navigationController setViewControllers:viewControllers]; //change the stack
  [self dismissModalViewControllerAnimated:YES];
}