将iOS键盘布局更改为表情符号吗？

Question

当UITextField成为第一响应者时，是否可以将键盘布局更改为表情符号？或根据用户的操作，例如点击UIButton

我知道我可以将键盘布局更改为以下之一：

typedef enum {
    UIKeyboardTypeDefault,                // Default type for the current input method.
    UIKeyboardTypeASCIICapable,           // Displays a keyboard which can enter ASCII characters, non-ASCII keyboards remain active
    UIKeyboardTypeNumbersAndPunctuation,  // Numbers and assorted punctuation.
    UIKeyboardTypeURL,                    // A type optimized for URL entry (shows . / .com prominently).
    UIKeyboardTypeNumberPad,              // A number pad (0-9). Suitable for PIN entry.
    UIKeyboardTypePhonePad,               // A phone pad (1-9, *, 0, #, with letters under the numbers).
    UIKeyboardTypeNamePhonePad,           // A type optimized for entering a person's name or phone number.
    UIKeyboardTypeEmailAddress,           // A type optimized for multiple email address entry (shows space @ . prominently).

    UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, // Deprecated

} UIKeyboardType;

我想知道是否可以对表情符号布局进行同样的操作？

Answer 1

* iOS13更新*

像这样创建UITextField的子类：

class EmojiTextField: UITextField {

   // required for iOS 13
   override var textInputContextIdentifier: String? { "" } // return non-nil to show the Emoji keyboard ¯\_(ツ)_/¯ 

    override var textInputMode: UITextInputMode? {
        for mode in UITextInputMode.activeInputModes {
            if mode.primaryLanguage == "emoji" {
                return mode
            }
        }
        return nil
    }
}

在IB中，选择该类作为UITextField的自定义类。

当字段成为第一响应者时，这将使键盘选择表情符号键盘（如果可用）。用户当然可以随时将键盘改回其他任何位置，但至少可以对您要的内容进行初始选择。

感谢blld在这里https://stackoverflow.com/a/58537544/1852207的回答。

Answer 2

我设法防止用户切换键盘！

使用该线程iOS: How to detect keyboard change event作为成分。

完整解决方案：

class EmojiTextField: UITextField {

       // required for iOS 13
       override var textInputContextIdentifier: String? { "" } // return non-nil to show the Emoji keyboard ¯\_(ツ)_/¯ 

        override var textInputMode: UITextInputMode? {
            for mode in UITextInputMode.activeInputModes {
                if mode.primaryLanguage == "emoji" {
                    return mode
                }
            }
            return nil
        }

    override init(frame: CGRect) {
            super.init(frame: frame)

            commonInit()
        }

        required init?(coder: NSCoder) {
            super.init(coder: coder)

             commonInit()
        }

        func commonInit() {
            NotificationCenter.default.addObserver(self,
                                                   selector: #selector(inputModeDidChange),
                                                   name: UITextInputMode.currentInputModeDidChangeNotification,
                                                   object: nil)
        }

        @objc func inputModeDidChange(_ notification: Notification) {
            guard isFirstResponder else {
                return
            }

            DispatchQueue.main.async { [weak self] in
                self?.reloadInputViews()
            }
        }
    }