objective-c - 使用 Cocoa/objective-C 的 HTTPS 请求

Question

我需要从我的应用程序发出 HTTPS 请求才能获取一些数据。我以前可以使用这里的方法来做到这一点

    -(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，这不起作用，具有此代码的旧应用程序仍然可以工作，但如果我创建一个新应用程序并发布此代码，我会收到错误

  [responseData setLength:0];

和

    [responseData appendData:data];

它说 NSString 没有可见的 @interface 声明 setLength 或追加数据。

有人可以告诉我为什么这不起作用吗？

提前致谢

Answer 1

简而言之

-(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);

}

工作正常