将 iOS 键盘布局更改为表情符号？

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;

我想知道是否有办法对表情符号布局执行相同的操作？

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 Interface Builder 中，选择此类作为自定义类来代替 UITextField。

当字段成为第一响应者时，这会导致键盘选择表情符号键盘（如果可用）。当然，用户可以随时将键盘更改回任何其他键盘，但至少它可以提供您想要的初始选择。

谢谢blld https://stackoverflow.com/users/4143698/blld他的回答在这里https://stackoverflow.com/a/58537544/1852207 https://stackoverflow.com/a/58537544/1852207.