帮助iPHone App上的奇怪文本验证问题

Question

我正在使用两种形式的文本验证（一种是当他们点击下一步，另一种是当他们手动选择下一个要输入的文本字段时），并且它一直在完美。但是，最后一个文本字段没有得到错误检查，我无法弄明白。

您可以在最后一个文字字段（http://screencast.com/t/ODJiOTAwMzA）中查看此视频中的问题。你可以看到前四个工作正常，但底部没那么多。

这是我的代码：

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    if (textField == txtUserName)
    {
        NSString *userNameOne = txtUserName.text;
        double numOne = [userNameOne doubleValue];  

        if(numOne < 30 || numOne > 80)
        {

            //foo

            [txtUserName becomeFirstResponder];
            txtUserName.text = nil;
        }
        else 
        {
            [txtUserName2 becomeFirstResponder];
        }
    }

    else if (textField == txtUserName2)
    {

        NSString *userNameThree = txtUserName2.text;
        float numTwo = [userNameThree doubleValue]; 

        if (numTwo < 20 || numTwo > 32)
        {
            //foo

            [txtUserName2 becomeFirstResponder];
            txtUserName2.text = nil;
        }
        else
        {
            [txtUserName3 becomeFirstResponder];
        }
    }
    else if (textField == txtUserName3)
    {
        NSString *userNameThree = txtUserName3.text;
        float numThree = [userNameThree doubleValue];

        if (numThree < 475 || numThree > 650)
        {
            //foo

            [txtUserName3 becomeFirstResponder];
            txtUserName3.text = nil;
        }
        else
        {
            [txtUserName4 becomeFirstResponder];

        }
    }
    else if (textField == txtUserName4)
    {
        NSString *userNameFour = txtUserName4.text; 
        double numFour = [userNameFour doubleValue];

        if (numFour < 0.5 || numFour > 3.00)
        {

                        //foo

            [txtUserName4 becomeFirstResponder];
            txtUserName4.text = nil;
        }
        else
        {
            [txtUserName5 becomeFirstResponder];
        }
    }

    else if (textField == txtUserName5)
    {
        NSString *userNameFive = txtUserName5.text;
        double numFive = [userNameFive doubleValue];

        if (numFive > 1)
        {
                        //foo

        }
    }
    return NO;
}

在这里

if (textField == txtUserName)
    {
        NSString *userNameOne = txtUserName.text;
        double numOne = [userNameOne doubleValue];  

        if(numOne < 30 || numOne > 80)
        {

                        //foo

            [txtUserName becomeFirstResponder];
            txtUserName.text = nil;
        }
        else 
        {
            [txtUserName2 becomeFirstResponder];
        }
    }

    else if (textField == txtUserName2)
    {

        NSString *userNameThree = txtUserName2.text;
        float numTwo = [userNameThree doubleValue]; 

        if (numTwo < 20 || numTwo > 32)
        {

                        //foo

            [txtUserName2 becomeFirstResponder];
            txtUserName2.text = nil;
        }
        else
        {
            [txtUserName3 becomeFirstResponder];
        }
    }
    else if (textField == txtUserName3)
    {
        NSString *userNameThree = txtUserName3.text;
        float numThree = [userNameThree doubleValue];

        if (numThree < 475 || numThree > 650)
        {
            //fo

            [txtUserName3 becomeFirstResponder];
            txtUserName3.text = nil;
        }
        else
        {
            [txtUserName4 becomeFirstResponder];

        }
    }
    else if (textField == txtUserName4)
    {
        NSString *userNameFour = txtUserName4.text; 
        double numFour = [userNameFour doubleValue];

        if (numFour < 0.5 || numFour > 3.00)
        {

            //foo

            [txtUserName4 becomeFirstResponder];
            txtUserName4.text = nil;
        }
        else
        {
            [txtUserName5 becomeFirstResponder];
        }
    }
    else if (textField == txtUserName5)
    {
        NSString *userNameFive = txtUserName5.text;
        double numFive = [userNameFive doubleValue];

        if (numFive > 1)
        {
            //foo
        }
        else
        {
            [txtUserName5 becomeFirstResponder];
        }
    }

Answer 1

如果您的界面在界面生成器中，是否连接了txtUserName5的出口？

对于你的第五个文本字段，为什么你不像在其他文本字段中那样在“foo”后面有这些行？

if (numFive > 1)
{
    //foo
    [txtUserName5 becomeFirstResponder];
    txtUserName5.text = nil;
}

另外，对于你的else子句，你应该再次成为第一响应者，而不是再次成为第一响应者（以解雇键盘）：

else
{
    //[txtUserName5 becomeFirstResponder];
    [txtUserName5 resignFirstResponder];
    return YES;
}