使用Cocoa/objective-C的HTTPS请求

我需要从我的应用程序发出HTTPS请求以获取一些数据。我以前可以用这种方法来做

    -(void)Authenticate
{
    self.responseData = [NSMutableData data];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://10.84.4.2:8444/fish-mobile/GetPIN.jsp?MSISDN=12345"]];
    //NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    [responseData setLength:0];

}
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

    - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:       (NSURLAuthenticationChallenge *)challenge {

    [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];

    [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [responseData appendData:data];
}

    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    self.responseData = nil;
}


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

      NSString *responseString = [[NSString alloc] initWithData:responseData       encoding:NSUTF8StringEncoding];


    NSLog(@"%@", responseString);

    }

但是，自从我升级了代码后，这就不起作用了，我的旧应用程序仍然可以使用这段代码，但是如果我创建了一个新的应用程序并在中发布了这段代码，我会发现一个错误

  [responseData setLength:0];

及

它说NSString没有可见的@interface声明setLength或appenddata

有人能告诉我为什么这不起作用吗

---

提前感谢

听起来好像您的responseData实例变量以某种方式被类型化为NSString。responseData ivar是如何定义的，除了您刚才发布的代理操作外，您是否在其上执行任何其他操作？

将其缩短到这一步

-(void) testme: (NSString *) link{
NSURL * url = [NSURL URLWithString:link];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];
[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPMethod:@"GET"];
[[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:YES];

}

方法是

    - (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {

    [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];

    [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}

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

    NSString *s = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@", s);

}

很好

    - (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
    return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {

    [challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];

    [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}

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

    NSString *s = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@", s);

}