ios - 从另一个类读取/写入 UITextField

Question

我有一个包含多个文本字段的 View ，我想从 viewController 中读取这些文本字段，进行验证，然后调用另一个文件中另一个类中的函数来写出结果。

我知道我可以返回结果并从 ViewController 中写入它们，但是某些函数(此处未显示)具有如此多的输入和输出字段，将它们传回似乎非常复杂。我该怎么做呢？我可以做吗？ (或者我只是想编写非常糟糕的代码？)

这是我目前拥有的简化版本:

MainViewController.swift:

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var fieldLength1: UITextField!  
    @IBOutlet weak var fieldLength2: UITextField!
    @IBOutlet weak var fieldLength3: UITextField!
    @IBOutlet weak var fieldLength4: UITextField!    
    @IBOutlet weak var fieldPerimeter: UITextField!    
    @IBOutlet weak var fieldArea: UITextField!    

    override viewDidLoad() {
        super.viewDidLoad()

        fieldLength1.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
        fieldLength2.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
        fieldLength3.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
        fieldLength4.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)

    }

    @objc func textFieldDidChange() _ textField: UITextField) {
        if isValidEntry(textField: textField) {
            // Here is where I would like to call the function in the other class
            // Something like:
            // MathFunc().perimeter(
            // MathFunc().area
        }
    }

    func isValidEntry() {
        // ensure entries are only numbers and that enough info is present for calculations
    }
}

数学函数.swift:

import Foundation

class MathFunctions {
    func perimeter(l1: Double, l2:Double, l3:Double, l4:Double) -> Double {
        let p = l1 + l2 + l3 + l4    
        // Here is where I would like to write the result to the UITextField
        // Something like:
        // fieldPerimeter.text = p //with some formatting not shown here
    }

    func area(width: Double, length:Double) -> Double {
        let rectArea = width * length 
        // Here is where I would like to write the result to the UITextField
        // Something like:
        // fieldArea.text = rectArea //with some formatting not shown here
    }
}

Answer 1

将您的 MathFunctions 更改为结构，并将其函数更改为 static。现在您可以从任何地方调用 MathFunctions.perimeter()。