2019-03-01

    [self.nameTF addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

- (void)textFieldDidChange:(UITextField *)textField

{

    if(textField == self.textFieldName) {

        if(textField.text.length >15) {

UITextRange *markedRange = [textField markedTextRange];

if (markedRange) {

return;

}

//Emoji占2个字符，如果是超出了半个Emoji，用15位置来截取会出现Emoji截为2半

        //超出最大长度的那个字符序列(Emoji算一个字符序列)的rangeNSRange range = [textField.text rangeOfComposedCharacterSequenceAtIndex:15];

            textField.text = [textField.text substringToIndex:range.location];

        }

    }

}