三、实例
#import "ViewController.h"@interface ViewController ()<NSURLSessionDataDelegate>@end@implementation ViewController - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ NSURL *url = [NSURL URLWithString:@"https://kyfw.12306.cn/otn/leftTicket/init"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]]; NSURLSessionDataTask *task = [session dataTaskWithRequest:request]; [task resume];}#pragma mark - NSURLSessionDataDelegate
- (void)URLSession:(NSURLSession *)sessiondidReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *credential))completionHandler{ NSURLSessionAuthChallengeDisposition disposition = NSURLSessionAuthChallengePerformDefaultHandling; __block NSURLCredential *credential = nil; if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) { credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]; if (credential) { disposition = NSURLSessionAuthChallengeUseCredential; } else { disposition = NSURLSessionAuthChallengePerformDefaultHandling; } } else { disposition = NSURLSessionAuthChallengeCancelAuthenticationChallenge; } if (completionHandler) { completionHandler(disposition, credential); }} - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{ NSLog(@"didReceiveResponse"); completionHandler(NSURLSessionResponseAllow);} - (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{ NSLog(@"didReceiveData");}
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{ NSLog(@"didCompleteWithError");}@end
四、问题
- 有时采用HTTPS 无法接受数据,是因为苹果将http使用的是TLS 1.2 SSL 加密请求数据,而服务器有的时候使用的还是TLS 1.1
- 解决办法:在 info.plist 中添加
- <key>NSAppTransportSecurity</key><dict>
<key>NSAllowsArbitraryLoads</key>
<true/></dict>
打造安全的 APP HTTPS