如何在iOS中为UITextFields实现自定义键盘

如何在iOS中为

UITextFields

实现自定义键盘，如上图所示

事实上，我是那样累的

- (IBAction)button2ABC:(id)sender
{
    keypadValue=@"2";
    if ([textFields_tag isEqualToString:@"one"]){
        pswdTxt1.text=keypadValue;
        pswdTxt1.text=[keypadValue  stringByAppendingString:keypadValue];
    }
    else if ([textFields_tag isEqualToString:@"two"]){
        pswdTxt2.text=keypadValue;
    }
    else if ([textFields_tag isEqualToString:@"three"]){
        pswdTxt3.text=keypadValue;
    }
    else if ([textFields_tag isEqualToString:@"four"]){
        PswdTxt4.text=keypadValue;
    }
}

每当我在选择

UITextfield

后按下按钮时，该字符将替换为前一个字符，而不是追加