限制键盘只能输入表情符号

Question

我有一个文本字段，只应包含表情符号。是否可以限制用户的键盘仅使用表情符号输入，即禁用其他键盘？

- JohnWickham

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每个表情符号都有对应的Unicode字符（U+1F30x，U+1F32x等）。也许你可以从一组“允许”的字符中过滤它们？ - Jesus Zamora

嗯，这是个好主意！ - JohnWickham

Answer 1

可以使用Interface Builder或按照本指南的方式以编程方式设置键盘类型：

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;

表情符号键盘被设置为单独的语言键盘，因此无法通过编程进行设置。它是由用户在设置应用程序中设置的。

我想，即使这很麻烦，您也可以向用户发出警报或在应用程序内提供帮助文件，以说明要获得最佳体验，他们需要启用该功能。

另外，请注意，我相信苹果现在拒绝创建自己的自定义表情符号键盘的应用程序，因为它已成为主要操作系统的一部分。

- jwknz

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谢谢Jeff，我就担心这个...我会想办法的！ - JohnWickham

Answer 2

目前我正在开发一个项目，其中需求与您相同，并尝试寻找解决方案，但未找到。我编写了一段代码，对我来说运行良好。希望它也能为您提供帮助。我知道现在可能已经太晚了，但这可以帮助您在将来。

我的解决方案是

#pragma mark validate emoji's

-(void)validateEmoji
{
BOOL lowerCaseLetter=0,upperCaseLetter= 0,digit=0,specialCharacter=0;
    for (int i = 0; i < [emojiTextField.text length]; i++)
    {
        unichar c = [emojiTextField.text characterAtIndex:i];
        if(!lowerCaseLetter)
        {
          lowerCaseLetter = [[NSCharacterSet     lowercaseLetterCharacterSet] characterIsMember:c];
        }
        if(!upperCaseLetter)
        {
            upperCaseLetter = [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:c];
        }
        if(!digit)
        {
            digit = [[NSCharacterSet decimalDigitCharacterSet] characterIsMember:c];
        }
        if(!specialCharacter)
        {
            specialCharacter = [[NSCharacterSet symbolCharacterSet] characterIsMember:c];
        }
    }

    if(lowerCaseLetter || upperCaseLetter || digit || specialCharacter)
    {
        // if textfield contains special characters,lowercase,uppercase,numeric digits
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error"
                                                        message:@"Please select only emoji's from Keyboard"
                                                       delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        emojiTextField.text=@"";
        [emojiTextField becomeFirstResponder];
        emojiTextFieldFlag = false;
    }
    else
    {
        emojiTextFieldFlag = true;
        // emoji is selected do whatever you want.
    }

}

#pragma mark TextField delegate methods
-(BOOL)textFieldShouldReturn:(UITextField *)textField
 {
if ([textField isEqual:emojiTextField])
{
    [emojiTextField resignFirstResponder];
    NSLog(@"%@",emojiTextField.text);
    // make it blank for next click when comes back
    appdelegate.appdelegateEmojiTextFieldClicked =@"";
    if (emojiTextFieldFlag)
    {
        [self saveEmojiJsonParsing];
    }
    else
    {
        [emojiTextField becomeFirstResponder];
    }
  }
  return YES;
  }

-(void)textFieldDidEndEditing:(UITextField *)textField
 {
   if ([textField isEqual:emojiTextField])
   {
    [self validateEmoji];
   }
 }

- sumit kapoor