Ios 如何检查rtmp或hls URL是否存在或它们是否'；我将在swift中给出404错误

我需要解析rss中的一些数据，并在swift 2中打开解析rss中的相关链接， 例如，我想检查此链接是否有效：

rtmp://185.23.131.187:1935/live/jomhori1

或者这个：

http://185.23.131.25/hls-live/livepkgr/_defint_/liveevent/livestream.m3u8

检查url验证的我的代码：

let urlPath: String = "http://185.23.131.25/hls-live/livepkgr/_defint_/liveevent/livestream.m3u8"
                            let url: NSURL = NSURL(string: urlPath)!
                            let request: NSURLRequest = NSURLRequest(URL: url)
                            let response: AutoreleasingUnsafeMutablePointer<NSURLResponse?>=nil

                            var valid : Bool!

                            do {
                                _ = try NSURLConnection.sendSynchronousRequest(request, returningResponse: response)
                            } catch {
                                print("404")
                                valid = false
                            }

让urlPath:String=”http://185.23.131.25/hls-live/livepkgr/_defint_/liveevent/livestream.m3u8"
让url:NSURL=NSURL（字符串：urlPath）！
let请求：NSURLRequest=NSURLRequest（URL:URL）
let响应：autoreleasingusafemutablepointer=nil
变量有效：Bool！
做{
_=尝试NSURLConnection.sendSynchronousRequest（请求，返回响应：响应）
}抓住{
打印（“404”）
有效=错误
}

我在网上搜索过，但我找到的所有方法对我的问题都没有帮助。

我在Objective C中找到了一个解决方案，因此我将代码移植到Swift（尽管您需要对其进行测试）：

---

为了便于使用，我写了下面的代码，它工作得很好

var video_Url = ""
    if let url  = NSURL(string: Response),
    data = NSData(contentsOfURL: url)
    {
        video_Url = Response
    }
    else
    {
        video_Url = ""
    }

---

@sschare给出的答案很好，但不推荐使用NSURLConnection，最好现在就使用NSURLSession

以下是我的URL测试类版本：

class URLTester {

    class func verifyURL(urlPath: String, completion: (isOK: Bool)->()) {
        if let url = NSURL(string: urlPath) {
            let request = NSMutableURLRequest(URL: url)
            request.HTTPMethod = "HEAD"
            let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { (_, response, error) in
                if let httpResponse = response as? NSHTTPURLResponse where error == nil {
                    completion(isOK: httpResponse.statusCode == 200)
                } else {
                    completion(isOK: false)
                }
            }
            task.resume()
        } else {
            completion(isOK: false)
        }
    }

}

您可以通过调用带有尾随闭包的类方法来使用它：

URLTester.verifyURL("http://google.com") { (isOK) in
    if isOK {
        print("This URL is ok")
    } else {
        print("This URL is NOT ok")
    }
}

Swift 3.0和URLSession

class URLTester {

  class func verifyURL(urlPath: String, completion: @escaping (_ isOK: Bool)->()) {
    if let url = URL(string: urlPath) {
      var request = URLRequest(url: url)
      request.httpMethod = "HEAD"
      let task = URLSession.shared.dataTask(with: request, completionHandler: { (data, response, error) in
        if let httpResponse = response as? HTTPURLResponse, error == nil {
          completion(httpResponse.statusCode == 200)
        } else {
          completion(false)
        }
      })
      task.resume()
    } else {
      completion(false)
    }
  }
}

---

这比只下载响应标题而不是整个页面要好（同样，它也比异步下载要好）。

由@Moritz提供的答案的Obj-C变体：

注意：我更喜欢函数而不是类，但行为是一样的：

+(void)verifyURL:(NSString*)urlPath withCompletion:(void (^_Nonnull)(BOOL isOK))completionBlock
{
    NSURL *url = [NSURL URLWithString:urlPath];
    if (url) {
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        request.HTTPMethod = @"HEAD";
        //optional: request.timeoutInterval = 3;
        NSURLSessionDataTask *dataTask = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
        {
            BOOL isOK = NO;
            if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
                int code = (int)((NSHTTPURLResponse*)response).statusCode;
                //note: you may want to allow other http codes as well
                isOK = !error && (code == 200);
            }
            completionBlock(isOK);
        }];
        [dataTask resume];
    } else {
        completionBlock(NO);
    }
}

下面是一个带有时间戳的调用：

NSDate *date1 = [NSDate date];
[AppDelegate verifyURL:@"http://bing.com" withCompletion:^(BOOL isOK) {
    NSDate *date2 = [NSDate date];
    if (isOK) {
        NSLog(@"url is ok");
    } else {
        NSLog(@"url is currently not ok");
    }
    NSTimeInterval diff = [date2 timeIntervalSinceDate:date1];
    NSLog(@"time to return: %.3f", diff);
}];

---

当你说valid时，你的意思是URL的格式是否正确，或者你是否得到了预期的响应？@sschare我的意思是，如果URL存在或不存在，我会处理404错误消息谢谢，我很感激。我会检查一下，然后告诉你答案。我会用它来看看它是否有效。

NSDate *date1 = [NSDate date];
[AppDelegate verifyURL:@"http://bing.com" withCompletion:^(BOOL isOK) {
    NSDate *date2 = [NSDate date];
    if (isOK) {
        NSLog(@"url is ok");
    } else {
        NSLog(@"url is currently not ok");
    }
    NSTimeInterval diff = [date2 timeIntervalSinceDate:date1];
    NSLog(@"time to return: %.3f", diff);
}];