当我尝试在iOS应用程序中传递NSURL中的参数时，为什么会出现此错误？ [英] Why do I get this error when I try to pass a parameter in NSURL in iOS app?

问题描述

这就是我在公共方法中所拥有的 - （IBAction）methodName

This is what I have in a public method - (IBAction)methodName

NSString *quoteNumber = [[self textBox] text];

NSURL *url = [[NSURL alloc] initWithString:@"http://TestSite.com/virdirectory/Webservice1/Service1.asmx/GetQuote?number=%d", quoteNumber];

我得到的错误是：

方法调用的参数太多，预期为1，有2

Too many arguments to method call, expected 1, have 2

我做错了什么？

推荐答案

initWithString 方法只接受普通的NSString，你传递它格式化的NSString，看看这段代码：

The initWithString method can only accept a normal NSString, you are passing it a formatted NSString, Take a look at this code:

    NSURL *url = [[NSURL alloc] initWithString:[NSString stringWithFormat:@"http://TestSite.com/virdirectory/Webservice1/Service1.asmx/GetQuote?number=%d", quotedNumber]];

这可能有点令人困惑，你可以按如下方式分解：

That might be a bit confusing, you can break it up as follows:

NSString *urlString = [NSString stringWithFormat:@"http://TestSite.com/virdirectory/Webservice1/Service1.asmx/GetQuote?number=%d", quotedNumber];

NSURL *url = [[NSURL alloc] initWithString:urlString];

现在您的字符串格式正确， NSURL initWithString 方法将起作用！

Now your string is properly formated, and the NSURL initWithString method will work!

此外，为了将来你更清楚，你可以在设置时利用Objective-C的点符号语法 quoteNumber 字符串，如下所示：

Also, just so it is clearer for you in the future, you can take advantage of Objective-C's dot notation syntax when you set your quoteNumber string, as follows:

NSString *quoteNumber = self.textBox.text;

此外，您试图将此引号传递到您的 urlString 作为一个数字（如％d 所示），请记住 quotedNumber 是一个NSString对象，当您尝试将其传递给 stringWithFormat 方法时会崩溃。您必须先将字符串转换为NSInteger或NSUInteger。

Also, you are trying to pass this quoted number into your urlString as a digit (as seen with the %d), remember that quotedNumber is a NSString object, and will crash when you try to pass it to the stringWithFormat method. You must convert the string first to a NSInteger, or NSUInteger.

请参阅这个问题如何做到这一点（不要担心它很容易）！

Please refer to this SO question to how to do that (don't worry it's very easy)!

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