通常我喜欢使用NSURL的sendAsynchronousRequest类方法,使用完成处理程序块来“点燃和忘记”,但似乎在需要验证时可能不是一个选项.
当使用完成处理程序样式请求,如下所示：
[NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mysite.com/"]]
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *response,NSData *data,NSError *error) {
//Do Stuff
}];
处理身份验证的正确方法是什么？我需要分配和初始化NSURLConnection并设置代理,而不是使用此类方法样式？我想我知道如何使用委托函数正确地进行身份验证,但是我想知道我是否可以将它包含在completionHandler块中,或者是否有更好的方法来执行此操作.
- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
if ([challenge prevIoUsFailureCount] > 0) {
NSLog(@"Authentication Failure");
[connection cancel];
}
else
{
NSURLCredential *credential = [NSURLCredential credentialWithUser:self.username
password:self.password
persistence:NSURLCredentialPersistenceForSession];
[[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}
}
解决方法
我认为completionHandler方法是基本请求.也许你可以考虑使用
AFNetworking,因为我使用块方法和身份验证.
编辑….
您是否尝试将身份验证标头添加到NSURLRequest？
创建一个NSMutableURLRequest：
NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.mysite.com/"]];
并添加如下认证头：
NSString *basicAuthCredentials = [NSString stringWithFormat:@"%@:%@",userName,password]; NSString *authValue = [NSString stringWithFormat:@"Basic %@",AFBase64EncodedStringFromString(basicAuthCredentials)]; [urlRequest setValue:authValue forHTTPHeaderField:@"Authorization"];
AFBase64EncodedStringFromString函数是这样的：
static NSString * AFBase64EncodedStringFromString(NSString *string) {
NSData *data = [NSData dataWithBytes:[string UTF8String] length:[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
NSUInteger length = [data length];
NSMutableData *mutableData = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t *input = (uint8_t *)[data bytes];
uint8_t *output = (uint8_t *)[mutableData mutableBytes];
for (NSUInteger i = 0; i < length; i += 3) {
NSUInteger value = 0;
for (NSUInteger j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
static uint8_t const kAFBase64EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
NSUInteger idx = (i / 3) * 4;
output[idx + 0] = kAFBase64EncodingTable[(value >> 18) & 0x3F];
output[idx + 1] = kAFBase64EncodingTable[(value >> 12) & 0x3F];
output[idx + 2] = (i + 1) < length ? kAFBase64EncodingTable[(value >> 6) & 0x3F] : '=';
output[idx + 3] = (i + 2) < length ? kAFBase64EncodingTable[(value >> 0) & 0x3F] : '=';
}
return [[NSString alloc] initWithData:mutableData encoding:NSASCIIStringEncoding];
}
然后调用您之前调用的函数,但使用您的新NSURLRequest：
[NSURLConnection sendAsynchronousRequest:urlRequest
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *response,NSError *error) {
//Do Stuff
}];
