Text length

gistfile1.txt

/**
 * Delegate method called before the text has been changed.
 * @param textField The text field containing the text.
 * @param range The range of characters to be replaced.
 * @param string The replacement string.
 * @return YES if the specified text range should be replaced; otherwise, NO to keep the old text.
 */
- (BOOL)textField:(UITextField *) textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSUInteger oldLength = [textField.text lengthOfBytesUsingEncoding:(0x80000000 + kCFStringEncodingDOSKorean)];
    NSUInteger replacementLength = [string lengthOfBytesUsingEncoding:(0x80000000 + kCFStringEncodingDOSKorean)];
    NSUInteger rangeLength = range.length;
    
    NSUInteger newLength = oldLength - rangeLength + replacementLength;
    
    CCLOG("old:%d,  replace:%d,  range:%d,  new:%d", oldLength, replacementLength, rangeLength, newLength);
    
    return oldLength/2 <= 5; // 5글자만 입력되도록
}