ios - 从另一个 UIViewController 推送 ViewController - Swift

Question

我有一堂这样的课，

import UIkit

class One {

    let btn = UIButton()

    override func viewDidLoad(){
        super.viewDidLoad()

        btn.frame = CGRectMake(10, 20, 30, 30)
        btn.setTitle("Go", forState: UIControlState.Normal)
        btn.addTarget(self, action: "goToClassTwo", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(btn)
    }

    func goToClassTwo(){
        if(AppGlobals().getIsFromDiffView()){
             let difView = UINavigationController(rootViewController: DiffView())
             difView.pushViewController(Two(), animated: true)
        }else{
             self.navigationController?.pushViewController(Two(), animated: true)
        }
    }
}

像这样的setter/getter类，

class AppGlobals: NSObject {

     var isFromDiffView = false

     func setIsFromDiffView(val: Bool){
         isFromDiffView = val
     }

     func getIsFromDiffView() -> Bool {
         return isFromDiffView
     }

}

我还有一个这样的类(class)，

class DiffView {

    let btn = UIButton()

    override func viewDidLoad(){
        super.viewDidLoad()

        btn.frame = CGRectMake(10, 20, 30, 30)
        btn.setTitle("Push", forState: UIControlState.Normal)
        btn.addTarget(self, action: "btnAction", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(btn)
    }

    func btnAction(){
        AppGlobals().setIsFromDiffView(true)
        One().goToClassTwo()
    }
}

我在这里遇到了一个问题。当点击“One”类中的“Go”按钮时，将显示“Two” View Controller 。但是，当我点击“DiffView”类中的“推送”按钮时，不会显示“两个” View Controller 。

我已经检查了设置断点。控件确实到达“One”类中的 goToClassTwo 函数，并且 if 路径正在执行。但未显示“两个” View Controller 。 difView.pushViewController 被调用。但它并没有插入到下一个 View 。

注意:我没有使用 Storyboard

如有任何帮助，我们将不胜感激!

Answer 1

这是更新后的代码。

“One”类的代码:

import UIKit

class One {

    let btn = UIButton()

    override func viewDidLoad(){
        super.viewDidLoad()

        btn.frame = CGRectMake(10, 20, 30, 30)
        btn.setTitle("Go", forState: UIControlState.Normal)
        btn.addTarget(self, action: "goToClassTwo", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(btn)
    }

    func goToClassTwo(){
        if(AppGlobals().getIsFromDiffView()){
             //Using the navigation controller of DiffView
             AppGlobals().getController().pushViewController(Two(), animated: true)
        }else{
             self.navigationController?.pushViewController(Two(), animated: true)
        }
    }
}

setter/getter 类:

class AppGlobals: NSObject {

     var isFromDiffView = false
     var cntrlr: UINavigationController!

     func setIsFromDiffView(val: Bool){
         isFromDiffView = val
     }

     func getIsFromDiffView() -> Bool {
         return isFromDiffView
     }

     //Setting and getting DiffView Navigation controller
     func setController(cntrl: UINavigationController){
         cntrlr = cntrl
     }

     func getController() -> UINavigationController {
         return cntrlr
     }

}

DiffView 类:

class DiffView {

    let btn = UIButton()

    override func viewDidLoad(){
        super.viewDidLoad()

        btn.frame = CGRectMake(10, 20, 30, 30)
        btn.setTitle("Push", forState: UIControlState.Normal)
        btn.addTarget(self, action: "btnAction", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(btn)
    }

    func btnAction(){
        AppGlobals().setIsFromDiffView(true)
        //Setting the navigation controller
        AppGlobals().setController(self.navigationController!)
        One().goToClassTwo()
    }
}

通过此更新的代码，将显示类“Two” View Controller 。感谢@zp_x 的帮助。