cocoa-touch - 如何根据 ASIHTTPRequest 执行不同的操作？

Question

我正在使用 ASIFormDataRequest 将图像上传到 TwitPic，我从这里收到了回复，一切正常。但是在 - (void)requestFinished:(ASIHTTPRequest *)request 上，我已经有了一个 TwitLonger 响应的 Action (可以正常工作)。现在我将如何根据响应类型执行不同的操作？我尝试设置一个字符串并与 if 进行比较，得到响应的最后一件事，但没有成功。这是我尝试过的方式:

- (void)requestFinished:(ASIHTTPRequest *)request
{
    NSString *responseString = [request responseString];

    NSString *first = [responseString substringFromIndex: [responseString length] - 7];
    NSLog(@"%@", first);
    if (first == @"</rsp>"+
        ) {
        NSString *responseString = [request responseString];
        NSLog(@"%@", responseString);
        NSString *result = nil;
        // Determine "<div>" location
        NSRange divRange = [responseString rangeOfString:@"<mediaurl>" options:NSCaseInsensitiveSearch];
        if (divRange.location != NSNotFound)
        {
            // Determine "</div>" location according to "<div>" location
            NSRange endDivRange;

            endDivRange.location = divRange.length + divRange.location;
            endDivRange.length   = [responseString length] - endDivRange.location;
            endDivRange = [responseString rangeOfString:@"</mediaurl>" options:NSCaseInsensitiveSearch range:endDivRange];

            if (endDivRange.location != NSNotFound)
            {
                // Tags found: retrieve string between them
                divRange.location += divRange.length;
                divRange.length = endDivRange.location - divRange.location;

                result = [responseString substringWithRange:divRange];
            }
            tweet.text = result;
            NSLog(@"%@", result);
        }
    } else {

    // Use when fetching text data
    NSString *responseString = [request responseString];
    NSLog(@"%@", responseString);
    NSString *result = nil;
        // Determine "<div>" location
        NSRange divRange = [responseString rangeOfString:@"<content>" options:NSCaseInsensitiveSearch];
        if (divRange.location != NSNotFound)
        {
            // Determine "</div>" location according to "<div>" location
            NSRange endDivRange;

            endDivRange.location = divRange.length + divRange.location;
            endDivRange.length   = [responseString length] - endDivRange.location;
            endDivRange = [responseString rangeOfString:@"</content>" options:NSCaseInsensitiveSearch range:endDivRange];

            if (endDivRange.location != NSNotFound)
            {
                // Tags found: retrieve string between them
                divRange.location += divRange.length;
                divRange.length = endDivRange.location - divRange.location;

                result = [responseString substringWithRange:divRange];
            }
            tweet.text = result;
            [_engine setAccessToken:token];
            [_engine sendUpdate:tweet.text];
            [self.parentViewController dismissModalViewControllerAnimated:true];
        }
    }
}

这是响应的一个例子:

<?xml version="1.0" encoding="UTF-8"?>
<rsp stat="ok">
 <mediaid>50ia96</mediaid>
 <mediaurl>URL GOES HERE</mediaurl>
</rsp>

最后，我想要的是获取标签之间的 URL。

提前致谢!

Answer 1

Go to their documentation ，然后向下滚动到“在委托(delegate)方法中处理多个请求的成功和失败”部分。他们为您提供了三种选择——大多数情况下，在您发出请求时设置 userInfo 字典就足够了，然后只需在您的回调中读取它并采取适当的行动。一些快速代码:

在创建和启动请求时设置:

request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys: @"firstRequestId", @"id", nil];

然后在你的回调中:

if([[request.userInfo objectForKey:@"id"] isEqualToString:@"firstRequestId"]) {
  // Handle the request with id 'firstRequestId'
}