一、基础代理
1.使用场景：网络错误提示，以及证书使用控制。
2.协议内容
@protocol NSURLConnectionDelegate <NSObject>
@optional
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection;
是否使用证书
- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge;
为指定的身份验证发送请求
@end
二、数据代理
1.使用场景：用于监测数据的发送和接受，请求状态，缓存控制。
2.协议内容
@protocol NSURLConnectionDataDelegate <NSURLConnectionDelegate>
@optional
- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
- (NSInputStream *)connection:(NSURLConnection *)connection needNewBodyStream:(NSURLRequest *)request;
- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten
totalBytesWritten:(NSInteger)totalBytesWritten
totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite;
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse;
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
@end
三、下载代理：
1.使用场景：特意为Newsstand下载杂志数据而设立。
使用NKAssetDownload的downloadWithDelegate:(id<NSURLConnectionDownloadDelegate>)delegate方法时使用。
2.协议内容：
@protocol NSURLConnectionDownloadDelegate <NSURLConnectionDelegate>
@optional
- (void)connection:(NSURLConnection *)connection didWriteData:(long long)bytesWritten totalBytesWritten:(long long)totalBytesWritten expectedTotalBytes:(long long) expectedTotalBytes;
- (void)connectionDidResumeDownloading:(NSURLConnection *)connection totalBytesWritten:(long long)totalBytesWritten expectedTotalBytes:(long long) expectedTotalBytes;
@required
- (void)connectionDidFinishDownloading:(NSURLConnection *)connection destinationURL:(NSURL *) destinationURL;
@end
四、方便发送同步请求的方法
+ (NSData *)sendSynchronousRequest:(NSURLRequest *)request returningResponse:(NSURLResponse **)response error:(NSError **)error;
五、方便发送异步请求的方法
+ (void)sendAsynchronousRequest:(NSURLRequest*) request
queue:(NSOperationQueue*) queue
completionHandler:(void (^)(NSURLResponse* response, NSData* data, NSError* connectionError)) handler NS_AVAILABLE(10_7, 5_0);
