1.urlsession https

- (void)URLSession:(NSURLSession *)session
didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
 completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler
{
   //AFNetworking中的處理方式
    NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling;
    __block NSURLCredential 
 
*credential = nil;  
    //判斷伺服器返回的證書是否是伺服器信任的
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
        /*disposition：如何處理證書
     NSURLSessionAuthChallengePerformDefaultHandling:預設方式處理
         NSURLSessionAuthChallengeUseCredential：使用指定的證書    NSURLSessionAuthChallengeCancelAuthenticationChallenge：取消請求
         
 
*/
        if (credential) {
            disposition = NSURLSessionAuthChallengeUseCredential;
        } else {
            disposition = NSURLSessionAuthChallengePerformDefaultHandling;
        }
    } else {
        disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge;
    }
    
 
//安裝證書
    if (completionHandler) {
        completionHandler(disposition, credential);
    }
}

https://www.jianshu.com/p/4b5d2d47833d

2.avplayer cache

https://github.com/XTShow/XTAudioPlayer/

https://www.jianshu.com/p/c157476474f1

https://github.com/newyjp/JPVideoPlayer