当使用UIWebview加载https的站点时webview总是会报NSURLErrorDomain code=-1202，导致网页加载失败。自己打印错误和网上搜索是因为证书失效，https使用超文本安全传输协议，即超文本传输协议（HTTP）和SSL/TLS的组合，用以提供加密通讯及对网络服务器身份的鉴定。当我们的服务器使用自我签名证书时，而UIWebView不允许使用自签名证书，所以导致加载失败。我们可以使用NSURLConnection通过它的代理canAuthenticateAgainstProtectionSpace可以允许这种情况,从而通过它进行认证。

#import <UIKit/UIKit.h>

#import "MyObject.h"

@interface ViewController :UIViewController<UIWebViewDelegate,NSURLConnectionDelegate>

{

   UIWebView *_web;

    NSURLConnection *_urlConnection;

    NSURLRequest *_request;

    BOOL _authenticated;

}

@end

@interfaceViewController ()

@end

@implementation ViewController

@synthesize myobject;

- (void)viewDidLoad

{

    [superviewDidLoad];

    _web = [[UIWebViewalloc] initWithFrame:CGRectMake(0,0,768,1024)];

    _web.delegate =self;

    _web.autoresizingMask =UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;

    [self.viewaddSubview:_web];

    NSURL* _loadingURL =[NSURLURLWithString:@"https://m.facebook.com/dialog/feed?link=http%3A%2F%2Fwww.facebook.com%2FeNGage.OnePub&description=Werwr4w532545245&access_token=BAAC117qbwhQBAFtqiZAmWH8hOtkJLOcC0OTgmYJxX5IybPlPp2ozoZBewaJXBtOagJ5bJItZCZBJ8o8Sal0c52Tt4h2XbPf2f5osEo1ZB2lQh0hF969zeOpoPu1BsS5Hgtr00U55gYb7ZABsvcFohG&caption=Page%201&name=eNGage&picture=http%3A%2F%2Fc1345842.cdn.cloudfiles.rackspacecloud.com%2Fassets%2Fapps%2Ficons%2F001%2F002%2F707%2Foriginal.png%3F1324531970&actions=%5B%7B%22name%22%3A%22Find%20out%20more%20about%20eNGage%22%2C%22link%22%3A%22http%3A%2F%2Fwww.facebook.com%2FeNGage.OnePub%22%7D%5D&app_id=199938153366036&redirect_uri=fbconnect%3A%2F%2Fsuccess&sdk=2&display=touch"];

    //_loadingURL=[NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[_loadingURL host]];

    _request = [NSMutableURLRequestrequestWithURL:_loadingURL];

    [_webloadRequest:_request];

// Do any additional setup after loading the view, typically from a nib.

//        UIImageView *uimage=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image27.png"]];

//    [self.view addSubview:uimage];

//    MyObject *object=[[MyObject alloc]init];

//    MyObject *object1=[object retain];

    //self.myobject=object;

    //myobject = object;

    //NSLog(@"******retainCount:%d",[myobject retainCount]);

    //NSLog(@"******self.retainCount:%d",[self.myobject retainCount]);

    //[object release];

}

- (void)didReceiveMemoryWarning

{

    [superdidReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

#pragma mark - Webview delegate

// Note: This method is particularly important. As the server is using a self signed certificate,

// we cannot use just UIWebView - as it doesn't allow for using self-certs. Instead, we stop the

// request in this method below, create an NSURLConnection (which can allow self-certs via the delegate methods

// which UIWebView does not have), authenticate using NSURLConnection, then use another UIWebView to complete

// the loading and viewing of the page. See connection:didReceiveAuthenticationChallenge to see how this works.

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

{

    NSLog(@"Did start loading: %@ auth:%d", [[requestURL]absoluteString],_authenticated);

    

    if (!_authenticated) {

        _authenticated =NO;

        

        _urlConnection = [[NSURLConnectionalloc] initWithRequest:_requestdelegate:self];

        

        [_urlConnectionstart];

        

        returnNO;

    }

    

    returnYES;

}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {

    // 102 == WebKitErrorFrameLoadInterruptedByPolicyChange

   NSLog(@"***********error:%@,errorcode=%d,errormessage:%@",error.domain,error.code,error.description);

    if (!([error.domainisEqualToString:@"WebKitErrorDomain"] && error.code ==102)) {

        //[self dismissWithError:error animated:YES];

    }

}

#pragma mark - NURLConnection delegate

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

{

    NSLog(@"WebController Got auth challange via NSURLConnection");

    

    if ([challengepreviousFailureCount] ==0)

    {

        _authenticated =YES;

        

        NSURLCredential *credential = [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust];

        

        [challenge.senderuseCredential:credentialforAuthenticationChallenge:challenge];

        

    } else

    {

        [[challenge sender]cancelAuthenticationChallenge:challenge];

    }

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response;

{

    NSLog(@"WebController received response via NSURLConnection");

    

    // remake a webview call now that authentication has passed ok.

    _authenticated =YES;

    [_webloadRequest:_request];

    

    // Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)

    [_urlConnectioncancel];

}

// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace

{

    return[protectionSpace.authenticationMethodisEqualToString:NSURLAuthenticationMethodServerTrust];

}

@end

/*************************************************************other****************************************************/

BOOL _Authenticated;
NSURLRequest *_FailedRequest;#pragma UIWebViewDelegate-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request   navigationType:(UIWebViewNavigationType)navigationType {BOOL result = _Authenticated;if (!_Authenticated) {_FailedRequest = request;NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];[urlConnection start];}return result;
}#pragma NSURLConnectionDelegate-(void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {NSURL* baseURL = [NSURL URLWithString:@"your url"];if ([challenge.protectionSpace.host isEqualToString:baseURL.host]) {NSLog(@"trusting connection to host %@", challenge.protectionSpace.host);[challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];} elseNSLog(@"Not trusting connection to host %@", challenge.protectionSpace.host);}[challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)pResponse {
_Authenticated = YES;[connection cancel];[self.webView loadRequest:_FailedRequest];

}

- (void)viewDidLoad{   [super viewDidLoad];    NSURL *url = [NSURL URLWithString:@"your url"];    NSURLRequest *requestURL = [NSURLRequest requestWithURL:url];    [self.webView loadRequest:requestURL]; // Do any additional setup after loading the view. }

/*************************************************************other****************************************************/

#pragma mark - Webview delegate// Note: This method is particularly important. As the server is using a self signed certificate,
// we cannot use just UIWebView - as it doesn't allow for using self-certs. Instead, we stop the
// request in this method below, create an NSURLConnection (which can allow self-certs via the delegate methods
// which UIWebView does not have), authenticate using NSURLConnection, then use another UIWebView to complete
// the loading and viewing of the page. See connection:didReceiveAuthenticationChallenge to see how this works.
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
{NSLog(@"Did start loading: %@ auth:%d", [[request URL] absoluteString], _authenticated);if (!_authenticated) {_authenticated = NO;_urlConnection = [[NSURLConnection alloc] initWithRequest:_request delegate:self];[_urlConnection start];return NO;}return YES;
}#pragma mark - NURLConnection delegate- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
{NSLog(@"WebController Got auth challange via NSURLConnection");if ([challenge previousFailureCount] == 0){_authenticated = YES;NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];[challenge.sender useCredential:credential forAuthenticationChallenge:challenge];} else{[[challenge sender] cancelAuthenticationChallenge:challenge];}
}- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
{NSLog(@"WebController received response via NSURLConnection");// remake a webview call now that authentication has passed ok._authenticated = YES;[_web loadRequest:_request];// Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)[_urlConnection cancel];
}// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace
{return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
}