查找 cookie 是否有变量值
在我之前在 stackoverflow 上找到的答案（现在找不到）中，有人建议使用 NSRange rangeOfString 来查看特定变量中是否有来自 cookie 的数据：
NSRange range = [[[NSHTTPCookie requestHeaderFieldsWithCookies:[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:[NSURL URLWithString:cookie]]] objectForKey:@"Cookie"] rangeOfString:@"variable"];
if (range.length != NSNotFound) {
//it has data
} else {
//it doesn't
}
从哪些资源中我可以找到这应该有效，但事实并非如此，即使 cookie 为空。
我做错了什么？
In a previous answer I found on stackoverflow (can't find now) someone suggested using NSRange rangeOfString to see if a particular variable had data in it from a cookie:
NSRange range = [[[NSHTTPCookie requestHeaderFieldsWithCookies:[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:[NSURL URLWithString:cookie]]] objectForKey:@"Cookie"] rangeOfString:@"variable"];
if (range.length != NSNotFound) {
//it has data
} else {
//it doesn't
}
From what resources I can find this should work, but it doesn't, even when the cookie is null.
What am I doing wrong?
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这有点奇怪。即使 range.length 显然为 null，如果您记录输出，您也无法检查其是否为 null 并且 NSNotFound 是否未按预期工作。您必须检查该值是否 > 0。
This is a bit odd. Even though range.length is apparently null if you log the output you can't check if its null and NSNotFound doesn't work as expected. You have to check if the value > 0.