试图在x86_64上检测Xcode中的验证码

I'm trying to detect when a verification code is entered into a text field, so like if I wanted someone to type in "this is a test.", it would then run the following code:

我正在尝试检测何时将验证码输入到文本字段中，如果我想要有人输入“这是一个测试”，那么它将运行以下代码：

system("say this is a test");

But I keep getting the error "void value not ignored as it ought to be". I have no idea what this means. This is what I have so far, but I think I need some other help in which I'll explain below the code.

但我一直得到错误“无法忽视虚空价值，因为它应该是”。我不知道这是什么意思。这是我到目前为止所做的，但我想我需要一些其他帮助，我将在下面解释代码。

if ([SpecialCodeTextField setStringValue:[@"this is a test." stringValue]])
{
    system("say this is a test");
}

But if I did something on the iPhone SDK, I could do something like:

但如果我在iPhone SDK上做了一些事情，我可以这样做：

if (MyTextField.text = @"this is a test")
{
    [firstView setHidden:YES];
    [secondView setHidden:NO];
}

Or something like that. So what is * MyTextField.text = @"this is a test" * on the x86_64 architecture, or when programming for Mac? I'll do a little school equation for you here:

或类似的东西。那么什么是* MyTextField.text = @“这是x86_64架构上的测试”*，还是为Mac编程？我会在这里为你做一个小学校方程式：

MyTextField.text = @"this is a test"; is to Changing textfield text on an iPhone

MyTextField.text = @“这是一个测试”;是在iPhone上更改文本字段文本

如

???????????????????????????? is to Changing textfield text on a Mac

????????????????????????????是在Mac上更改文本字段文本

1 个解决方案

#1

First of all take a look into the documentation of NSControl. In your first example you are messaging a NSControl to set a string value. (BTW. when you use the @"Whatever String" notation you implicitly create a static NSString object, so there is no need to call stringValue).

首先来看看NSControl的文档。在第一个示例中，您将向NSControl发送消息以设置字符串值。（顺便说一下。当你使用@“Whatever String”符号时，你隐式创建一个静态NSString对象，所以不需要调用stringValue）。

However, the documentation for -setStringValue: says that the message returns void, but your if structure expects any value to check.

但是，-setStringValue：的文档说消息返回void，但if结构需要检查任何值。

In your second example, your code does two things. 1.) It assigns the text member of MyTextField @"this is a test". 2.) The if structure tests the text for nil.

在第二个示例中，您的代码执行两项操作。 1.）它指定MyTextField的文本成员@“这是一个测试”。 2.）if结构测试文本为零。

What exactly do you want? If you want to check the NSTextField if its not nil, you would do something like this

你到底想要什么？如果你想检查NSTextField，如果它不是nil，你会做这样的事情

if([specialCodeTextField stringValue]){
  ...
}

If you want to check if the textValue in your NSTextField contains "this is a test" you would do something like this:

如果要检查NSTextField中的textValue是否包含“这是一个测试”，您可以执行以下操作：

if([[specialCodeTextField stringValue] isEqualToString:@"this is a test"]) {
  ...
}

#1