'[[String]]'为预期的参数类型'[String]'

Question

我在我的一个项目中遇到了错误：

无法将类型[[[String]]'的值转换为预期的参数类型'[String]'

我完全理解这个错误; 我在数组中的数组中有一个字符串，无法将其转换为数组中的字符串。 但是我遇到的问题是解决方法。 我想做的是返回一个标题字符串作为按钮，将其强制转换为7行，强制7行转换为4行。 因此，按钮从字符串转换为UIButton，行是转换为UIViews的数组，而组是转换为UIViews的数组。 但是，当我去进行小组训练时，这就是我得到错误的机会。 以下是相关代码，任何帮助将不胜感激（对英语不好的情况感到抱歉）：

let buttonTitles1 = ["1","2","3","4","5","6","7"]
let buttonTitles2 = ["1","2","3","4","5","6","7"]
let buttonTitles3 = ["1","2","3","4","5","6","7"]
let buttonTitles4 = ["1","2","3","4","5","6","7"]

let row1 = buttonTitles1
let row2 = buttonTitles2
let row3 = buttonTitles3
let row4 = buttonTitles4

let matrixTitle1 = [buttonTitles1, buttonTitles1, buttonTitles1, buttonTitles1]
let matrixTitle2 = [buttonTitles1, buttonTitles1, buttonTitles1, buttonTitles1]

let matrix1 = createArraysOfButtons(matrixTitle1)
let matrix2 = createArraysOfButtons(matrixTitle2)

keyBoardKeys.addSubview(matrix1) //ERROR
keyBoardKeys.addSubview(matrix2) //ERROR

//BUTTON FUNCTION

func createButtonWithTitle(title: String) -> UIButton {

    let button = UIButton(type:.System) as UIButton
    button.translatesAutoresizingMaskIntoConstraints = false
    button.setTitle(title, forState: .Normal)
    button.sizeToFit()
    button.titleLabel!.font = UIFont.systemFontOfSize(15)
    button.backgroundColor = UIColor.greenColor()
    button.setTitleColor(UIColor.whiteColor(), forState: .Normal)
    print("BUTTON")
    return button
}

//ROW FUNCTION

func createRowOfButtons(buttonTitles: [String]) -> UIView {

    var buttons = [UIButton]()
    let keyboardRowView = UIView()
    keyboardRowView.translatesAutoresizingMaskIntoConstraints = false

    for buttonTitle in buttonTitles{

        let button = createButtonWithTitle(buttonTitle as String)
        buttons.append(button)
        keyboardRowView.addSubview(button)
    }

    addIndividualButtonConstraints(buttons, mainView: keyboardRowView)
    print("ROW")
    return keyboardRowView
}

//MATRIX FUNCTION

func createArraysOfButtons (rowTitles: [String]) -> UIView {

    var rows = [UIView]()
    let keyArrayView = UIView()

    for rowTitle in rowTitles {
            let row = createRowOfButtons([rowTitle])
            rows.append(row)
            keyArrayView.addSubview(row)
    }

    addConstraintsToInputView(rows, mainView: keyArrayView)
    print("MATRIX")
    return keyArrayView
}

Answer 1

您的问题在于此功能：

func createArraysOfButtons (rowTitles: [String]) -> UIView {

    var rows = [UIView]()
    let keyArrayView = UIView()

    for rowTitle in rowTitles {
            let row = createRowOfButtons([rowTitle])
            rows.append(row)
            keyArrayView.addSubview(row)
    }

    addConstraintsToInputView(rows, mainView: keyArrayView)
    print("MATRIX")
    return keyArrayView
}

它应该使用一个数组数组，而不是一个简单的数组，将函数更改为：

func createArraysOfButtons (rowTitles: [[String]]) -> UIView {

var rows = [UIView]()
let keyArrayView = UIView()

for rowTitle in rowTitles {
        let row = createRowOfButtons(rowTitle) // remove square brakets
        rows.append(row)
        keyArrayView.addSubview(row)
}

addConstraintsToInputView(rows, mainView: keyArrayView)
print("MATRIX")
return keyArrayView
}

考虑一下您的工作，您有一个[String]：

let buttonTitles4 = ["1","2","3","4","5","6","7"]

然后将其存储到另一个数组中，使其成为[[String]]

let matrixTitle1 = [buttonTitles1, buttonTitles1, buttonTitles1, buttonTitles1]

然后，您正在调用函数

let matrix1 = createArraysOfButtons(matrixTitle1)