UITextField输入中文

 [self.rightTF addTarget:self action:@selector(rightTFValueChange:) forControlEvents:UIControlEventEditingChanged];

-(void)rightTFValueChange:(UITextField *)textField{
    UITextRange *selectedRange = [self.rightTF markedTextRange];
    NSString * newText = [self.rightTF  textInRange:selectedRange];
    //获取高亮部分
    if(newText.length>) return;
    //不允许输入空格
    self.rightTF.text = [self.rightTF.text stringByReplacingOccurrencesOfString:@" " withString:@""];
    if (self.rightTF == textField) {//文本框最大长度
        textField.text = textField.text.length >  ? [textField.text substringToIndex:] : textField.text;
    }
    self.writeStr(self.rightTF.text);

}