误差Domain=NSURLErrorDomain

Question

对于这个问题我很抱歉。我是iOS的新手。

我正在编写xcode 7.1。我在我的Local server上调用一个Local server，但是我得到了这个错误。我不知道为什么。我已经尝试和寻找了几天，但我找不到任何相关的东西。这是我的密码

NSString *myUrlString = [NSString stringWithFormat:@"%@%@/login",link,Entry ];

//create string for parameters that we need to send in the HTTP POST body
    NSLog(@"My Url = %@",myUrlString);
    NSMutableDictionary* postRequestDictionary = [[NSMutableDictionary alloc] init];

    postRequestDictionary[@"email" ]= EmailIDTF.text;
    postRequestDictionary[@"password" ]= PasswordTF.text;


    NSLog(@"body = %@",postRequestDictionary);
    NSData *json;
    NSString *jsonString;
    NSError *error;

    // Dictionary convertable to JSON ?
    if ([NSJSONSerialization isValidJSONObject:postRequestDictionary])
    {
        // Serialize the dictionary
        json = [NSJSONSerialization dataWithJSONObject:postRequestDictionary options:NSJSONWritingPrettyPrinted error:&error];

        // If no errors, let's view the JSON
        if (json != nil && error == nil)
        {
            jsonString = [[NSString alloc] initWithData:json encoding:NSUTF8StringEncoding];

            NSLog(@"JSON: %@", jsonString);

        }
    }

    //create a mutable HTTP request
    NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[myUrlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]
                                                              cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                                                          timeoutInterval:60.0];                //sets the receiver’s timeout interval, in seconds
    [urlRequest setTimeoutInterval:30.0f];
    //sets the receiver’s HTTP request method
    [urlRequest setHTTPMethod:@"POST"];



    [urlRequest addValue:@"application/json" forHTTPHeaderField:@"Content-type"];



    NSString *params = [NSString stringWithFormat:@"%@",jsonString];
    NSLog(@"param = %@",params);
    //sets the request body of the receiver to the specified data.
    [urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];

    //allocate a new operation queue
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];

  //Loads the data for a URL request and executes a handler block on an
    //operation queue when the request completes or fails.
    [NSURLConnection
     sendAsynchronousRequest:urlRequest
     queue:queue
     completionHandler:^(NSURLResponse *response,
                         NSData *data,
                         NSError *error) {
         if ([data length] >0 && error == nil){
             //process the JSON response
             //use the main queue so that we can interact with the screen
             dispatch_async(dispatch_get_main_queue(), ^{
                 [self parseResponse1:data];
             });
         }
         else if ([data length] == 0 && error == nil){
             NSLog(@"Empty Response, not sure why?");
         }
         else if (error != nil){
             dispatch_async(dispatch_get_main_queue(), ^{
                 NSLog(@"Not again, what is the error = %@", error);
                 UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Alert!" message:@"Please check that you are connected to internet." delegate:self cancelButtonTitle:@"I got it." otherButtonTitles: nil];
                 //                         spinnerview.hidden=YES;
                 [alert show];

             });

         }
     }];

但我所得到的只是这个错误

错误UserInfo={NSErrorFailingURLKey=http://xyz/login，Domain=NSURLErrorDomain代码=-1012“(空)”UserInfo={_kCFURLErrorAuthFailedResponseKey={url NSErrorFailingURLStringKey=http://xyz/login，NSUnderlyingError=0x165a0f80 {Error Domain=kCFErrorDomainCFNetwork Code=-1012 "(null)“UserInfo={_kCFURLErrorAuthFailedResponseKey={url=http://xyz/login}

问题是它为什么要给“(空)”？请帮帮我伙计们。提前谢谢。

Answer 1

在您的info.plist文件中添加此键后，尝试：

<key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>

希望这能有所帮助。

Answer 2

使用以下代码调用web服务

 NSString *myUrlString = [NSString stringWithFormat:@"%@%@/login",link,Entry ];      
NSMutableDictionary* postRequestDictionary = [[NSMutableDictionary alloc] init]; 
postRequestDictionary[@"email" ]= EmailIDTF.text;     
postRequestDictionary[@"password" ]= PasswordTF.text;



NSString *mystring=[self returnMeParameterString:postRequestDictionary];
NSURL *url = [NSURL URLWithString:myUrlString];

NSData *postData = [mystring dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[mystring length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setHTTPBody:postData];

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse response, NSData data, NSError *connectionError) {
    
    if(connectionError)
    {
       //error
    }
    else
    {
       //success
    }
}];

pragma标记将字典转换为字符串

 -(NSString*)returnMeParameterString:(NSDictionary *)params{

NSMutableString *paramstring = [[NSMutableString alloc] init];

NSMutableArray *keyArray = [[NSMutableArray alloc] init];

NSMutableArray *valueArray = [[NSMutableArray alloc] init];

for( NSString *aKey in [params allKeys] )
{
    [keyArray addObject:aKey];
}

for( NSString *aValue in [params allValues] )
{
    [valueArray addObject:aValue];
}

for (int k=0; k< keyArray.count; k++)
{
    NSString *tempString;
    
    if(k==0)
    {
        tempString = [NSString stringWithFormat:@"%@=%@",[keyArray objectAtIndex:k],[valueArray objectAtIndex:k]];
    }
    else
    {
        tempString = [NSString stringWithFormat:@"&%@=%@",[keyArray objectAtIndex:k],[valueArray objectAtIndex:k]];
    }
    
    [paramstring appendString:tempString];
    
}

return paramstring;
}