ios - 如何使用一个 var 或 let 从一个 View Controller 到另一个 View Controller

Question

我制作了一个弹出 View Controller ，但现在我尝试通过准备函数将数据从弹出窗口传递到 View Controller 。让我们来看看。

// this is from the pop up view controller

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let toBeMoved :ViewController = segue.destination as! ViewController
    toBeMoved.enterVC()
    amountEntered.text = "\(runningNumber1)"
} 

// and I added a func in my main VC but I can't get the var in the VC
// totalCash is a label to be changed when the amount is entered from the
// pop up vc

func enterVC () {
    totalCash.text = "\(amountEntered)"
}

我将 enterVC 添加到 viewDidLoad。

Answer 1

试试这个并看看:

class TestVC: UIViewController {

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let toBeMoved :ViewController = segue.destination as! ViewController
        toBeMoved.amountEntered = runningNumber1
        toBeMoved.enterVC()
    }

}

class ViewController: UIViewController {   
    var amountEntered: Int = 0
    func enterVC () {
        totalCash.text = "\(amountEntered)"
    }
}

<小时/>

或者也尝试一下。

class TestVC: UIViewController {

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let toBeMoved :ViewController = segue.destination as! ViewController
        toBeMoved.enterVC(amountEntered: runningNumber1)
    }

}


class ViewController: UIViewController {      
    func enterVC (amountEntered: Int) {
        totalCash.text = "\(amountEntered)"
    }
}