从https链接获取图像 [英] fetching an image from a https link

问题描述

我刚刚开始学习ios开发，我正在尝试从使用ssl的网站获取图像，当我通过浏览器（笔记本电脑）连接到该网站时，会出现一条警告，指出根证书不受信任，我不是网站的所有者，但我完全可以信任它。
我的第一次尝试：

I have just started learning ios development, and I am trying to get an image from website which uses ssl, when i connect to the site through a browser(laptop) there is a warning which says that the root certificate is not trusted, I am not the owner of the website, however I can fully trust it. My first attempt:

self.eventImage.image = [UIImage imageWithData:
[NSData dataWithContentsOfURL:
[NSURL  URLWithString:imageUrl]]];

所以我收到此错误

NSURLConnection / CFURLConnection HTTP加载失败（kCFStreamErrorDomainSSL，-9807）

NSURLConnection/CFURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9807)

我试图向用户发送图片通过启动ios网络浏览器链接，当他们这样做时，他们会收到一条消息，询问他们是否可以信任，如果他们点击是，图像就会出现，但我希望图像出现在应用程序内。

I have tried to send users to the picture link by starting ios web browser, when they do that, they would get a message asking them if they could trust it or not, if they hit yes the image will appear, however i want the image to appear inside the application.

我也试过使用网页浏览但不起作用。

I have also tried to use web view but it didn't work.

这里建议的大多数类似问题使用这个

Most of the similar questions in here suggested using this

- (BOOL)connection:(NSURLConnection *)
  connection canAuthenticateAgainstProtectionSpace: 
  (NSURLProtectionSpace *)protectionSpace {
    return NO;
    //return [protectionSpace.authenticationMethod isEqualToString:
    //         NSURLAuthenticationMethodServerTrust];
}

- (void)connection:(NSURLConnection *)
  connection didReceiveAuthenticationChallenge:
  (NSURLAuthenticationChallenge *)challenge {
     NSString *imageUri =[self.detailItem objectForKey: @"image"];
     NSArray *trustedHosts = [[NSArray alloc]initWithObjects:imageUri, nil];
     if ([challenge.protectionSpace.authenticationMethod   
         isEqualToString:NSURLAuthenticationMethodServerTrust])
        if ([trustedHosts containsObject:challenge.protectionSpace.host])
               [challenge.sender useCredential:[NSURLCredential credentialForTrust:
                challenge.protectionSpace.serverTrust] forAuthenticationChallenge:
                challenge];

 [challenge.sender continueWithoutCredentialForAuthenticationChallenge:challenge];
}

但是我添加它们时从未调用过这两种方法。

but these two methods were never called when I add them.

推荐答案

更改您的代码。而不是使用 NSData dataWithContentsOfURL：，您需要使用自己的显式 NSURLConnection 。然后你可以使用适当的 NSURLConnectionDelegate 方法。

Change your code. Instead of using NSData dataWithContentsOfURL: you need to use your own explicit NSURLConnection. Then you can make use of the appropriate NSURLConnectionDelegate methods.

另一种选择是使用流行的 AFNetworking library 。

Another option is to use the popular AFNetworking library.

这篇关于从https链接获取图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！