我有一个小型iPhone应用程序，它使用导航控制器显示3个视图（这里全屏）：
然后（在同一个UIWebView中）需要获取权限：
在上面讨论的各种过渡效果中，这是我的解决方案。它具有以下优点：
Segue 代码：
- (void)perform {
// Grab Variables for readability
UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
UIViewController *destinationController = (UIViewController*)[self destinationViewController];
UINavigationController *navigationController = sourceViewController.navigationController;
// Get a changeable copy of the stack
NSMutableArray *controllerStack = [NSMutableArray arrayWithArray:navigationController.viewControllers];
// Replace the source controller with the destination controller, wherever the source may be
[controllerStack replaceObjectAtIndex:[controllerStack indexOfObject:sourceViewController] withObject:destinationController];
// Assign the updated stack with animation
[navigationController setViewControllers:controllerStack animated:YES];
}
您可以使用自定义转场：为此，您需要创建一个继承UIStoryboardSegue的类（例如MyCustomSegue），然后可以使用以下内容覆盖“perform”
-(void)perform {
UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
UIViewController *destinationController = (UIViewController*)[self destinationViewController];
UINavigationController *navigationController = sourceViewController.navigationController;
// Pop to root view controller (not animated) before pushing
[navigationController popToRootViewControllerAnimated:NO];
[navigationController pushViewController:destinationController animated:YES];
}
此时进入Interface Builder，选择“自定义”segue，并输入你的类名（例如MyCustomSegue）
In swift
override func perform() {
if let navigationController = self.source.navigationController {
navigationController.setViewControllers([self.destination], animated: true)
}
}
sourceViewController.navigationController 保存到变量中，因此在 perform 中的最后一个命令之前变成了 nil - 这就是为什么它对我不起作用的原因。但是当前版本完美地工作，谢谢！Lauro和Bhavya的答案也非常有深度。 - Alexander Farber自定义转场对我没有起作用，因为我有一个启动页视图控制器，并且想要替换它。由于列表中只有一个视图控制器，所以popToRootViewController仍然将启动页保留在堆栈中。 我使用以下代码替换了单个控制器
-(void)perform {
UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
UIViewController *destinationController = (UIViewController*)[self destinationViewController];
UINavigationController *navigationController = sourceViewController.navigationController;
[navigationController setViewControllers:@[destinationController] animated:YES];
}
现在在 Swift 4 中：
class ReplaceSegue: UIStoryboardSegue {
override func perform() {
source.navigationController?.setViewControllers([destination], animated: true)
}
}
现在在Swift 2.0中
class ReplaceSegue: UIStoryboardSegue {
override func perform() {
sourceViewController.navigationController?.setViewControllers([destinationViewController], animated: true)
}
}
tableViewCell创建了一个segue到一个viewController。该segue被设置为自定义，使用ReplaceSegue类。 - Paul Bénéteau对于这个问题，我认为答案很简单，只需：
然后像下面一样将ViewControllers数组设回navigationController中：
if let navController = self.navigationController {
let newVC = DestinationViewController(nibName: "DestinationViewController", bundle: nil)
var stack = navController.viewControllers
stack.remove(at: stack.count - 1) // remove current VC
stack.insert(newVC, at: stack.count) // add the new one
navController.setViewControllers(stack, animated: true) // boom!
}
可以完美地与Swift 3一起使用。
希望能对一些新手有所帮助。
干杯。
ima747的swift 2版本答案：
override func perform() {
let navigationController: UINavigationController = sourceViewController.navigationController!;
var controllerStack = navigationController.viewControllers;
let index = controllerStack.indexOf(sourceViewController);
controllerStack[index!] = destinationViewController
navigationController.setViewControllers(controllerStack, animated: true);
}
正如他所提到的，它具有以下优点:
if let条件语句中获取索引，这样就不需要强制解包变量，从而避免可能出现的错误。 - AfonsoImplement an IBAction method in the viewController you want to unwind to(in this case viewController1). The method name can be anything so long that it takes one argument of the type UIStoryboardSegue.
@IBAction func unwindToMyAuth(segue: UIStoryboardSegue) {
println("segue with ID: %@", segue.Identifier)
}
Link this method in the viewController(3) you want to unwind from. To link, right click(double finger tap) on the exit icon at the top of the viewController, at this point 'unwindToMyAuth' method will show in the pop up box. Control click from this method to the first icon, the viewController icon(also present at the top of the viewController, in the same row as the exit icon). Select the 'manual' option that pops up.
In the Document outline, for the same view(viewController3), select the unwind segue you just created. Go to the attributed inspector and assign a unique identifier for this unwind segue. We now have a generic unwind segue ready to be used.
Now, the unwind segue can be performed just like any other segue from the code.
performSegueWithIdentifier("unwind.to.myauth", sender: nil)
这种方法可以让你从viewController3返回到viewController1，而无需将viewController2从导航层次结构中移除。
与其他segue不同，反向segue不会实例化一个视图控制器，它只会去到导航层次结构中现有的一个视图控制器。
如之前的回答所述，将弹出窗口从未动画变为推送动画再次变为弹出动画会显得不太好看，因为用户会看到实际的过程。我建议您先进行推送动画，然后再移除之前的视图控制器。操作方式如下：
extension UINavigationController {
func replaceCurrentViewController(with viewController: UIViewController, animated: Bool) {
pushViewController(viewController, animated: animated)
let indexToRemove = viewControllers.count - 2
if indexToRemove >= 0 {
viewControllers.remove(at: indexToRemove)
}
}
}
class SegueNavigationReplaceTop: UIStoryboardSegue {
override func perform () {
guard let navigationController = source.navigationController else { return }
navigationController.popViewController(animated: false)
navigationController.pushViewController(destination, animated: false)
}
}
swift3 中创建一个segue
- 添加标识符
- 在segue(storyboard)中添加并设置自定义storyboard类，来自cocoatouch文件
- 在自定义类中重写perform()方法override func perform() {
let sourceViewController = self.source
let destinationController = self.destination
let navigationController = sourceViewController.navigationController
// Pop to root view controller (not animated) before pushing
if self.identifier == "your identifier"{
navigationController?.popViewController(animated: false)
navigationController?.pushViewController(destinationController, animated: true)
}
}
override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
return false
}
请使用以下代码作为最后一个视图控制器 您可以使用其他按钮或将其放置在您自己的位置，而不是我使用的取消按钮
- (void)viewDidLoad
{
[super viewDidLoad];
[self.navigationController setNavigationBarHidden:YES];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(dismiss:)];
self.navigationItemSetting.leftBarButtonItem = cancelButton;
}
- (IBAction)dismissSettings:(id)sender
{
// your logout code for social media selected
[self.navigationController popToRootViewControllerAnimated:YES];
}
setNavigationBarHidden:NO 吧？你的代码很好用，谢谢。这也是一个不错的位置来放置社交网络注销代码。 - Alexander Farber