swift 从另一个文件访问变量

Question

我是一个新手swift程序员，我被要求写一个应用程序，让你输入一个词，然后生成一个随机的俳句这是一个带有两个 ViewController 的选项卡式应用程序。（诗）基于那个词。所以在 FirstViewController 中我有数据，我想在 SecondViewController 中以一种很好的方式显示该数据。我有所有的诗行，都在 FirstViewController 中，但我想在 SecondViewController 中访问这些变量。我已经尝试创建一个函数，它只返回它们，然后在 SecondViewController 中调用该函数，但没有任何结果，因为该函数只是返回 nil。如果你们中的任何人能提供帮助，我们将很高兴谢谢！

这是 FirstViewController：

import UIKit
import Foundation


class FirstViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var keyWordTextField: UITextField!

@IBOutlet weak var syllableSlider: UISlider!   
@IBOutlet weak var syllableSliderLabel: UILabel!
var syllableSliderValue = 1


@IBOutlet weak var lineOneTextField: UITextField!

@IBOutlet weak var lineTwoTextField: UITextField!
@IBOutlet weak var lineThreeTextField: UITextField!


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    lineOneTextField.text = "Rad 1"
    lineTwoTextField.text = "Rad 2"
    lineThreeTextField.text = "Rad 3"


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func syllableValueChanged(sender: UISlider) {
    syllableSliderValue = Int((sender.value))
    syllableSliderLabel.text = "Ordet har: \(syllableSliderValue) stavelser"
}


@IBAction func getNewHaiku() {
    if keyWordTextField.text != "" {
        let keyWord = keyWordTextField.text
        let lineOne = generateLine(keyWord: keyWord, syllables: syllableSliderValue,        lineSyllableLenght: 5)
        let lineTwo = generateLine(keyWord: keyWord, syllables: syllableSliderValue, lineSyllableLenght: 7)
        let lineThree = generateLine(keyWord: keyWord, syllables: syllableSliderValue,  lineSyllableLenght: 5)
        lineOneTextField.text! = lineOne
        lineTwoTextField.text! = lineTwo
        lineThreeTextField.text! = lineThree
    }

}
func generateLine(#keyWord: String, syllables : Int, lineSyllableLenght : Int) -> String {
    let oneSyllables = Dict().oneSyllables
    let twoSyllables = Dict().twoSyllables
    let threeSyllables = Dict().threeSyllables
    let fourSyllables = Dict().fourSyllables

    let randomOneSyllableWordNumber = Int(arc4random_uniform(UInt32(oneSyllables.count)))
    let randomTwoSyllableWordNumber = Int(arc4random_uniform(UInt32(twoSyllables.count)))
    let randomThreeSyllableWordNumber = Int(arc4random_uniform(UInt32(threeSyllables.count)))
    let randomFourSyllableWordNumber = Int(arc4random_uniform(UInt32(fourSyllables.count)))

    var lineArray : [String] = []
    var line = ""
    lineArray.append(keyWord)

    if syllables == 1 {
        let randomWordMethod = Int(arc4random_uniform(2))

        if randomWordMethod == 0 {

            lineArray.append(fourSyllables[randomFourSyllableWordNumber])

        } else if randomWordMethod == 1 {

            lineArray.append(threeSyllables[randomThreeSyllableWordNumber])
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
        } else if randomWordMethod == 2 {

            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
            lineArray.append(twoSyllables[randomOneSyllableWordNumber])
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
        }

    } else if syllables == 2 {
        let randomWordMethod = Int(arc4random_uniform(2))

        if randomWordMethod == 0 {

            lineArray.append(twoSyllables[randomOneSyllableWordNumber])
            lineArray.append(oneSyllables[randomTwoSyllableWordNumber])
        } else if randomWordMethod == 1 {

            lineArray.append(threeSyllables[randomThreeSyllableWordNumber])
        } else if randomWordMethod == 2 {
            lineArray.append(twoSyllables[randomTwoSyllableWordNumber])
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
        }
    } else if syllables == 3 {
        let randomWordMethod = Int(arc4random_uniform(1))

        if randomWordMethod == 0 {
            lineArray.append(twoSyllables[randomTwoSyllableWordNumber])
        } else if randomWordMethod == 1 {
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
        }

    } else if syllables == 4 {
        lineArray.append(oneSyllables[randomOneSyllableWordNumber])
    }

    if lineSyllableLenght == 7 {
        let randomWordMethod = Int(arc4random_uniform(1))

        if randomWordMethod == 0 {
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
            lineArray.append(oneSyllables[randomOneSyllableWordNumber])
        } else if randomWordMethod == 1 {
            lineArray.append(twoSyllables[randomTwoSyllableWordNumber])
        }
    }
    for word in lineArray {
        line += " \(word)"
    }
    line += ","

    return line
}

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    self.view.endEditing(true)
}
func getData() -> (line2: String, line3: String) {

    return (lineTwoTextField.text, lineThreeTextField.text)

}


}

Ps，"Dict"是另一个文件，但只包含单词。

第二个视图控制器是空白的。

Answer 1

您需要在第二个视图控制器中传递这样的实例：

var firstViewController: FirstViewController?

然后在知道两者的主实例中：

secondViewController.firstViewController = firstViewController

（例如 awakeFromNib）假设它们在主实例中是已知的，例如

let firstViewController = FirstViewController()
let secondViewController = SecondViewController()

最后在 SecondViewController 中您可以访问第一个：

firstViewController?.generateLine....

Answer 2

或者您可以将其设为全局变量，这样任何文件都可以访问它。

struct structname {
    static var yourvariable = value
}

调用时输入

filename.structname.yourvariable

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