我最近从ASIHTTPRequest迁移到AFNetworking，这一直是很大的。 然而，我与连接服务器有一些问题，有时会导致我的请求超时。 当使用ASIHTTPRequest它使用以下选择是可能的设置上在超时的情况下的请求的重试计数
-setNumberOfTimesToRetryOnTimeout:
这可以在这个帖子得到进一步参考， 可以在ASIHTTPRequest重试？
如果您不熟悉这AFNetworking https://github.com/AFNetworking/AFNetworking#readme
我无法找到AFNetworking等效的API，有没有人发现，超时使用AFNetworking事件重试网络请求的解决方案？
AFNetworking的马特·汤普森开发商还跟回答这个对我来说。 下面是GitHub的链接解释的解决方案。
https://github.com/AFNetworking/AFNetworking/issues/393
基本上，AFNetworking不支持此功能。 它留给了开发者对个案基础上实现如下图所示（马特 - 汤普森在github上回答）
- (void)downloadFileRetryingNumberOfTimes:(NSUInteger)ntimes
success:(void (^)(id responseObject))success
failure:(void (^)(NSError *error))failure
{
if (ntimes <= 0) {
if (failure) {
NSError *error = ...;
failure(error);
}
} else {
[self getPath:@"/path/to/file" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
if (success) {
success(...);
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[self downloadFileRetryingNumberOfTimes:ntimes - 1 success:success failure:failure];
}];
}
}
我在ApiClient类实现私有方法：
- (void)sendRequest:(NSURLRequest *)request successBlock:(void (^)(AFHTTPRequestOperation *operation, id responseObject))successBlock failureBlock:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failureBlock
{
__block NSUInteger numberOfRetries = 3;
__block __weak void (^weakSendRequestBlock)(void);
void (^sendRequestBlock)(void);
weakSendRequestBlock = sendRequestBlock = ^{
__strong typeof (weakSendRequestBlock)strongSendRequestBlock = weakSendRequestBlock;
numberOfRetries--;
AFHTTPRequestOperation *operation = [self.httpManager HTTPRequestOperationWithRequest:request success:successBlock failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSInteger statusCode = [[[error userInfo] objectForKey:AFNetworkingOperationFailingURLResponseErrorKey] statusCode];
if (numberOfRetries > 0 && (statusCode == 500 || statusCode == 502 || statusCode == 503 || statusCode == 0)) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 2 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
strongSendRequestBlock();
});
} else {
if (failureBlock) {
failureBlock(operation, error);
}
}
}];
[self.httpManager.operationQueue addOperation:operation];
};
sendRequestBlock();
}
使用示例：
- (void)getSomeDetails:(DictionaryResultBlock)block
{
if (!block) {
return;
}
NSString *urlString = @"your url string";
NSMutableURLRequest *request = [self.httpManager.requestSerializer requestWithMethod:@"POST" URLString:[[NSURL URLWithString:urlString relativeToURL:self.defaultUrl] absoluteString] parameters:nil error:nil];
// Configure you request here
[request setValue:version forHTTPHeaderField:@"client-version"];
NSMutableDictionary *bodyParams = @{};
[request setHTTPBody:[NSJSONSerialization dataWithJSONObject:bodyParams options:0 error:nil]];
[self sendRequest:request successBlock:^(AFHTTPRequestOperation *operation, id responseObject) {
id response = [NSJSONSerialization JSONObjectWithData:responseObject options:0 error:nil];
block(response, nil);
} failureBlock:^(AFHTTPRequestOperation *operation, NSError *error) {
block(nil, error);
}];
}
就我而言，我经常需要重试功能，所以我想出了这个重试策略类，这将有助于你与机智AFNetworking + RetryPolicy
对于AFNetworking 3.0它可以更好地服务。
根据您的回答，您可以通过使用块以作为参数块做一些更通用的（和棘手的）：
typedef void (^CallbackBlock)(NSError* error, NSObject* response);
- (void) performBlock:(void (^)(CallbackBlock callback)) blockToExecute retryingNumberOfTimes:(NSUInteger)ntimes onCompletion:(void (^)(NSError* error, NSObject* response)) onCompletion {
blockToExecute(^(NSError* error, NSObject* response){
if (error == nil) {
onCompletion(nil, response);
} else {
if (ntimes <= 0) {
if (onCompletion) {
onCompletion(error, nil);
}
} else {
[self performBlock:blockToExecute retryingNumberOfTimes:(ntimes - 1) onCompletion:onCompletion];
}
};
});
}
然后围绕类似下面的异步HTTP请求：
[self performBlock:^(CallbackBlock callback) {
[...]
AFHTTPRequestOperationManager *manager = [WSManager getHTTPRequestOperationManager];
[manager POST:base parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
dispatch_async(dispatch_get_main_queue(), ^(void){
if (callback) {
callback(nil, responseObject);
}
});
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
if (callback) {
NSError* errorCode = [[NSError alloc] initWithDomain:AppErrorDomain code:[operation.response statusCode] userInfo:@{ NSLocalizedDescriptionKey :error.localizedDescription}];
callback(errorCode, nil);
}
}];
} retryingNumberOfTimes:5 onCompletion:^(NSError *error, NSObject* response) {
//everything done
}];
通过这种方式，重试等待HTTP请求完成，你不必实现每个请求方法重试循环。
