Question

我正在使用https://xx.app.goo.gl/?link=http%3A%2F%2Fxx.com%2F%3Fusn%3Dabc%26pass%3Ddef&apn=com.xx&afl=http://google.com进行JSON解析。我正在编写这样的代码，但在运行应用程序时不会调用委托方法。即NSURLSession和connectionDidFinishLoading方法。如何调用didReceiveData方法？

NSURLSessionDelegate

Answer 1

您正在使用共享会话。这是一个没有委托的预先存在的会话。如果您希望任务调用委托方法，则必须：

创建自己的会话
指定在创建该会话时要用作委托的对象
在该会话中创建任务，而不是共享会话。

Answer 2

添加此两个代表 NSURLSessionDelegate，NSURLSessionDataDelegate

-(void)viewDidLoad {
    [super viewDidLoad];

    [self sendHTTPPost];

}
-(void) sendHTTPPost
{
    NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: self delegateQueue: [NSOperationQueue mainQueue]];

    NSURL * url = [NSURL URLWithString:@"http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo"];
    NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];

    [urlRequest setHTTPMethod:@"POST"];

    NSURLSessionDataTask * dataTask = [defaultSession dataTaskWithRequest:urlRequest];
    [dataTask resume];

}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
 completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler
{
    NSLog(@"### handler 1");

    completionHandler(NSURLSessionResponseAllow);
}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
    NSError *error;

    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

    NSLog(@" dict=>> %@",dict);

}
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
    if(error == nil)
    {
        NSLog(@"Download is Succesfull");
    }
    else
        NSLog(@"Error %@",[error userInfo]);
}

Answer 3

您必须在类定义附近编写委托方法; 样品：
@interface MyControllerClass：＆lt;＆gt;中的UIViewController UIAlertViewDelegate

不会调用NSURLSessionDelegate connectionDidFinishLoading方法

3 个答案: