Question

我目前正在使用CarbonKit库开发iOS应用程序进行导航。我目前在第一个标签中有UITableView，我想在选择单元格时以编程方式导航到另一个标签。

我在我的主CarbonKit视图控制器下实现了以下功能：

import CarbonKit

class ViewController: UIViewController, CarbonTabSwipeNavigationDelegate {


    func carbonTabSwipeNavigation(carbonTabSwipeNavigation: CarbonTabSwipeNavigation, viewControllerAtIndex index: UInt) -> UIViewController      {

        switch index {
        case 0:
            return self.storyboard!.instantiateViewControllerWithIdentifier("AircraftViewController") as! AircraftViewController
        case 1:
            return self.storyboard!.instantiateViewControllerWithIdentifier("LoadController") as! LoadController
        case 3:
            return self.storyboard!.instantiateViewControllerWithIdentifier("SettingsController") as! SettingsController
        default:
            return self.storyboard!.instantiateViewControllerWithIdentifier("ViewControllerOne") as! ViewControllerOne
        }   
    }

    func navigate(index: UInt) {
        carbonTabSwipeNavigation.setCurrentTabIndex(index, withAnimation: true)  
    }

}

setCurrentTabIndex是库提供的以编程方式切换标签的功能。

在我UITableViewController我有以下内容：

import UIKit
import CarbonKit

class SecondViewController: UITableViewController {

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        \\ First Attempt
        (ViewController() as CarbonTabSwipeNavigationDelegate).navigate(2)

        \\ Second Attempt
        let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("controller") as! ViewController
        viewController.navigate(2)
   }

}

据我所知，我第一次尝试创建了ViewController的新实例，而我的第二次尝试并没有选择我希望的实例。

如何在ViewController的{{1}}的第一个实例中最好地激活方法？

Answer 1

首先在您的CarbonTabSwipeNavigation课程中添加SecondViewController媒体资源，这样您就可以访问导航提供商了：

import UIKit
import CarbonKit

class SecondViewController: UITableViewController {
    weak var carbonNavigation : CarbonTabSwipeNavigation?;

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
       if let carbonNav = self.carbonNavigation {
           carbonNav.setCurrentTabIndex(index, withAnimation: true)
       }
   }

}

接下来我们需要设置carbonNavigation属性，以便可以使用。看起来你的CarbonTabSwipeNavigationDelegate是一个不错的地方。在旁注中，我看不到您的代表返回SecondViewController - 是否有意？

import CarbonKit

class ViewController: UIViewController, CarbonTabSwipeNavigationDelegate {


    func carbonTabSwipeNavigation(carbonTabSwipeNavigation: CarbonTabSwipeNavigation, viewControllerAtIndex index: UInt) -> UIViewController      {

        switch index {
        case 0:
            let aircraftVC = self.storyboard!.instantiateViewControllerWithIdentifier("AircraftViewController") as! AircraftViewController
            aircraftVC.carbonNavigation = carbonTabSwipeNavigation
            return aircraftVC
        case 1:
            // do something similar, instantiate view controller, set navigation property
            return self.storyboard!.instantiateViewControllerWithIdentifier("LoadController") as! LoadController
        case 3:
            // do something similar, instantiate view controller, set navigation property
            return self.storyboard!.instantiateViewControllerWithIdentifier("SettingsController") as! SettingsController
        default:
            // do something similar, instantiate view controller, set navigation property
            return self.storyboard!.instantiateViewControllerWithIdentifier("ViewControllerOne") as! ViewControllerOne
        }   
    }

    func navigate(index: UInt) {
        carbonTabSwipeNavigation.setCurrentTabIndex(index, withAnimation: true)  
    }
}

您还可以添加ViewController属性而不是CarbonTabSwipeNavigation，并在ViewController中公开您需要的所有方法作为方法。这意味着更改属性声明的类型并将其设置为self而不是carbonTabSwipeNavigation。

Swift - 如何从特定实例调用方法？

1 个答案: