目标 C：Add/Perform 导航控制器中的多个 segue

Question

我正在实现一个有 6-7 个屏幕流入的应用程序功能。并且用户可以 left/close 在任何屏幕上流动。

但是当用户再次申请时，他们应该跳转到他离开的最后一个屏幕，并且他可以回到之前的屏幕。

例如：我开始申请申请并完成到第 4 个屏幕并关闭。再次申请，我必须直接跳转到第 4 个屏幕，并且还可以从堆栈返回到第 3->2->1 个屏幕。

当前代码：

Storyboard 中 1-7 屏幕的 Segue 标识符为 "screen1"、"screen1" ... "screen7"

来自HomeScreen.m

-(void)toPersonalApplication {

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Personal" bundle:nil];
    ScreenOne *screenOne = [storyboard instantiateViewControllerWithIdentifier:@"screenOne"];
    UINavigationController* nav = [[UINavigationController alloc] initWithRootViewController:screenOne];
    [self presentViewController:nav animated:YES completion:nil];
}

正在检查用户是否已经启动了申请流程：

在 ScreenOne.m

   - (IBAction)btnNextClick:(id)sender {

        if (doneProcessTill == 4) {

        // Should be execute something like this here
        // [self performSegueWithIdentifier:@"screen2" sender:self];
        // [self performSegueWithIdentifier:@"screen3" sender:self];
        // [self performSegueWithIdentifier:@"screen4" sender:self];
      }

    }

感谢您的建议！谢谢

Answer 1

如我的评论所述，解决方案可能如下所示：

- (void)toPersonalApplication {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Personal" bundle:nil];

    NSMutableArray *viewControllers = [NSMutableArray array];
    for (NSInteger i = 1; i <= doneProcessTill; ++i) {
        UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:[NSString stringWithFormat:@"screen%ld", (long)i]];
        [viewControllers addObject:viewController];
    }

    UINavigationController *navigationController = [UINavigationController new];
    navigationController.viewControllers = viewControllers;

    [self presentViewController:navigationController animated:YES completion:nil];
}

Answer 2

对于这种情况，最好保存视图控制器，然后在您想返回到原来的位置时再次显示它们。在任何时候，您都可以使用 navigationController.viewControllers 获取当前的视图控制器。要设置整个堆栈，您只需在导航控制器上调用 setViewControllers。

您可以覆盖导航控制器来存储控制器数组。或者您可以静态保存它。以您的情况更方便为准。

静态的看起来像这样：

static NSArray<UIViewController *> *__preservedControllers = nil;

@implementation ViewController

- (void)onClose {
    __preservedControllers = self.navigationController.viewControllers;
    // Insert logic to close the whole procedure
}

- (void)reopenSavedStack {
    if(__preservedControllers) {
        [self.navigationController setViewControllers:__preservedControllers animated:YES];
        __preservedControllers = nil;
    }
}

使用子类化导航控制器它可能看起来更好：

@interface MyNavigationController : UINavigationController

@property (nonatomic, strong) NSArray<UIViewController *> *savedStack;

@end

@implementation MyNavigationController

- (void)saveStack {
    self.savedStack = self.viewControllers;
}

- (void)restoreStack:(BOOL)animated {
    if(self.savedStack.count > 0) {
        [self setViewControllers:self.savedStack animated:YES];
        self.savedStack = nil;
    }
}

@end

但是你确实需要进行类型转换：

- (void)onClose {
    [(MyNavigationController *)self.navigationController saveStack];
    // Insert logic to close the whole procedure
}

- (void)reopenSavedStack {
    [(MyNavigationController *)self.navigationController restoreStack:YES];
}

目标 C：Add/Perform 导航控制器中的多个 segue

ObjectiveC: Add/Perform multiple segue in navigation controller

ios

objective-c

uinavigationcontroller

segue