访问 iOS 中的联系人后无法拨打网络电话？

Question

我遇到了一个非常奇怪的情况 here.In 我的应用程序我正在尝试访问用户 phone 的联系人，当用户授予权限时，我正在尝试对 server.My 代码在访问联系人时工作正常，然后在进行网络调用后永远不会调用委托方法。

代码

ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, NULL);
    if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined)
    {
        ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error) {
            // First time access has been granted, add the contact
            NSLog(@"access contact");
            [self sample];//Here is the function i call for making network request.
        });
    }
    else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized)
    {
        // The user has previously given access, add the contact
        NSLog(@"previous access");
    }
    else
    {
        // The user has previously denied access
        // Send an alert telling user to change privacy setting in settings app
        NSLog(@"send alert");
    }

网络请求函数

-(void)sample
{
    NSLog(@"sample func called");
    // Create the request.
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.42/login"]];

    // Specify that it will be a POST request
    request.HTTPMethod = @"POST";

    // This is how we set header fields
    [request setValue:@"application/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];

    // Convert your data and set your request's HTTPBody property
    NSString *stringData = @"some data";
    NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
    request.HTTPBody = requestBodyData;

    // Create url connection and fire request
    sampleConn= [[NSURLConnection alloc] initWithRequest:request delegate:self];


}

委托方法

 //delegate methods of NSURLCONNECTION
    - (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response
    {
        NSLog(@"response recieved");

    }
    - (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
    {

        if([connection isEqual:sampleConn])
        {
            NSLog(@"this is sample");

        }
    }
    - (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
    {
        NSLog(@"fail to load");

    }
    - (void)connectionDidFinishLoading:(NSURLConnection *)connection
    {



    }

当我调用 [self sample]; 时，函数被调用，但委托方法从未被调用，如果我从代码中的其他任何地方调用此函数，我不会得到 that.But 的响应，然后它工作正常。

Answer 1

尝试这样使用

dispatch_async(dispatch_get_main_queue(), ^{

    [self sample];
});

访问 iOS 中的联系人后无法拨打网络电话？

unable to make network call after accessing contacts in iOS?

iphone

xcode

objective-c

ipad

ios