Swift：NSString不能轉換爲'字符串'

Question

我是新來的Swift，我試圖返回一組數組，但現在我陷入了一個錯誤的圈子。任何幫助，將不勝感激。我可能錯過了一些東西，但它確實不喜歡它：

編輯：添加的代碼（未設置數組的約束）。

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) 

    return button 
} 

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

    var buttons = [UIButton]() 
    let keyboardRowView = UIView() 

    for buttonTitle in buttonTitles{ 

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

    addIndividualButtonConstraints(buttons, mainView: keyboardRowView) 

    return keyboardRowView 
} 

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

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

    for rowTitle in rowTitles { 
     if let title = rowTitle as? String{ 
      let row = createRowOfButtons(rowTitle as String) 
      rows.append(row) 
      keyArrayView.addSubview(row) 
     } 
    } 
    return keyArrayView 
} 

錯誤消息：

'NSString' is not implicitly convertible to 'String'; did you mean to use 'as' to explicitly convert?

Answer 1

簡單的解決方案：不要使用NSString

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

    var buttons = [UIButton]() 
    let keyboardRowView = UIView() 

    for buttonTitle in buttonTitles{ 

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

    addIndividualButtonConstraints(buttons, mainView: keyboardRowView) 

    return keyboardRowView 
} 

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) 
    } 
    return keyArrayView 
} 

的主要問題是，createRowOfButtons預計字符串數組，但你傳遞該方法的單個字符串。 createRowOfButtons([rowTitle])解決了這個問題。