使用 %@ 设置 NSURL 使值等于 %@ 而不是插入 %@
我正在使用 ASIHTTP 并尝试对站点执行 GET 请求：
NSURL *url = [[NSURL URLWithString:@"/verifyuser.aspx?user=%@" relativeToURL:@"http://domain.com"],userName retain];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setTemporaryFileDownloadPath:@"myfile2.txt"];
[request setDownloadDestinationPath:@"myfile.txt"];
[request startSynchronous];
但是，当我在 [request startSynchronous] 上放置断点并进入调试器时，请求对象的 url 值等于 userName 变量。我试图将 userName 变量插入到字符串中，然后将其用作 url，因此我的 NSURL 声明中有些问题。
感谢您的帮助！
I'm using ASIHTTP and trying to perform a GET request for a site:
NSURL *url = [[NSURL URLWithString:@"/verifyuser.aspx?user=%@" relativeToURL:@"http://domain.com"],userName retain];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setTemporaryFileDownloadPath:@"myfile2.txt"];
[request setDownloadDestinationPath:@"myfile.txt"];
[request startSynchronous];
However, when I put a breakpoint on [request startSynchronous] and go into the debugger, the url value of the request object is equal to the userName variable. I'm trying to insert the userName variable into a string and then use that as the url, so something's not right in my NSURL declaration.
Thanks for your help!
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您的代码不正确，您没有正确进行字符串格式化，它应该如下所示：
请注意，您不需要保留 url，因为您只是将其传递给请求。
Your code is incorrect, you are not properly doing string formatting, it should look like this:
Note that you don't need to retain the url as you are just passing it to the request as well.
此 NSURL 方法不需要格式字符串。 Objective-C 编译器对方法的期望做出了相当弱的假设，这可能是您困惑的根源。
使用
[NSString stringWithFormat:@"..."]代替。目前，您使用的语法解析为
NSURL* url = [(NSURL* object), userName keep];，正如您可能猜到的那样，这是无效的。事实上，我真的很想知道这是如何编译的。This NSURL method does not expect a format string. The Objective-C compiler makes pretty weak assumptions about what a method expects, which might be the source of your confusion.
Use
[NSString stringWithFormat:@"..."]instead.Currently the syntax you use resolves to
NSURL* url = [(NSURL* object), userName retain];, which is, as you might guess, invalid. As a matter of fact, I really wonder how come this compiles.