iphone - NSURLConnection は、dataWithContentsOfURL が行うデータを返しません

Question

私はアプリケーションを持っていて、以前は .json で json データを取得していましdataWithContentsOfURLた。
しかし、非同期の方法で取得する必要があるためです。
これを処理するために使用するようになったので、メソッドNSURLConnectionでステータスコード 200 を取得するだけで、有用なデータを受け取りませんが、呼び出されることはありません。そしてリターンで。didReceiveResponsedidReceiveDataconnectionDidFinishDownloading destinationURLnull

この問題が何を引き起こしているのかわかりません。助けていただければ幸いです。

代理人

#import "NetWorkToGuiDelegate.h"

@implementation NetWorkToGuiDelegate
@synthesize data;
@synthesize caller;

- (id) init: (SEL) pointer :(NSObject *) c;
{
    doWhenDone = pointer;
    self.caller = c;
    data = [[NSMutableData alloc]init];
    return self;
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSString *responseText = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];

    NSLog(@"%@",responseText);

}

- (void)connectionDidFinishDownloading:(NSURLConnection *)connection destinationURL:(NSURL *)destinationURL
{
    NSLog(@"post download finished");
    data = [NSData dataWithContentsOfURL:destinationURL];
    NSLog(@"data: %@",data);
    NSLog(@"URLconnection %@", connection.currentRequest);

    #pragma clang diagnostic push
    #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    [caller performSelector:doWhenDone withObject:data];
    #pragma clang diagnostic pop
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [self.data setLength:0];
    NSHTTPURLResponse *resp= (NSHTTPURLResponsae *) response;
    NSLog(@"got responce with status %d",[resp statusCode]);
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)d
{
    NSLog(@"data recieved %@",d);
    [self.data appendData:d];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    [[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", @"")
                                message:[error localizedDescription]
                               delegate:nil
                      cancelButtonTitle:NSLocalizedString(@"OK", @"")
                      otherButtonTitles:nil] show];
    NSLog(@"failed");
}

// Handle basic authentication challenge if needed
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    NSString *username = @"username";
    NSString *password = @"password";

    NSURLCredential *credential = [NSURLCredential credentialWithUser:username
                                                             password:password
                                                          persistence:NSURLCredentialPersistenceForSession];
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}

@end

呼び出し

NetWorkToGuiDelegate *nwgd = [[NetWorkToGuiDelegate alloc] init:@selector(login:) :self];
    NSString *stringURL = [NSString stringWithFormat:@"%@%@%@%@", dk.baseURL, @"menu?code=",dk.loginCode,@"&v=1"];
    NSURL *url = [NSURL URLWithString:stringURL];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:nwgd];
    [urlConnection start];

呼び出しがメインスレッドで発生することを追加します