Objective c NSMutableURLRequest在使用NSURLSession时发送2次
我正在使用Objective c NSMutableURLRequest在使用NSURLSession时发送2次,objective-c,asp.net-web-api,nsurlsession,nsmutableurlrequest,nsurlsessionconfiguration,Objective C,Asp.net Web Api,Nsurlsession,Nsmutableurlrequest,Nsurlsessionconfiguration,我正在使用NSMutableURLRequest在使用时工作正常 - (void)postAsynchronousOnQueue:(NSOperationQueue*)queue completionHandler:(void (^)(NSURLResponse*, NSData*, NSError*))completionHandler { NSURLRequest* request = [self createPostRequest]; [NSURLConnection se
NSMutableURLRequest
在使用时工作正常
- (void)postAsynchronousOnQueue:(NSOperationQueue*)queue completionHandler:(void (^)(NSURLResponse*, NSData*, NSError*))completionHandler {
NSURLRequest* request = [self createPostRequest];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:completionHandler];
}
-(NSURLRequest*)createPostRequest {
NSMutableURLRequest* request = [[HttpRequest requestWithRelativePath:@"/photo"] toNSMutableURLRequest];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[self encodeParamsForUpload]];
return request;
}
但问题是,当我的应用程序处于后台模式时,它将无法工作
下面是我的HttpRequest
类方法:
+(id)requestWithRelativePath:(NSString*)docpath {
return [[HttpRequest alloc] initWithRelativePath:docpath server:server username:email password:password];
}
-(id)initWithRelativePath:(NSString*)docpath server:(NSString*)server username:(NSString*)username password:(NSString*)password {
if (self = [super init]) {
docpath = [docpath stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
_request = [self createRequestWithDocPath:docpath server:server username:username password:password];
}
return self;
}
- (NSMutableURLRequest*)createRequestWithDocPath:(NSString*)docpath server:(NSString*)server username:(NSString*)username password:(NSString*)password {
NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"https://%@%@", server, docpath]];
NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setTimeoutInterval:120.0];
if ((username != nil) && (password != nil)){
NSString *authStr = [NSString stringWithFormat:@"%@:%@", username, password];
NSData *authData = [authStr dataUsingEncoding:NSUTF8StringEncoding];
NSString *authValue = [NSString stringWithFormat:@"Basic %@", [self base64Encoding:authData]];
[request setValue:authValue forHTTPHeaderField:@"Authorization"];
}
return request;
}
在中,我发现堆栈溢出NSURLSession
在后台处理API调用。所以我使用了nsursession
。这是我更新的代码,我做到了:
- (void)postAsynchronousOnQueue:(NSOperationQueue*)queue completionHandler:(void (^)(NSURLResponse*, NSData*, NSError*))completionHandler {
NSURLRequest* request = [self createPostRequest];
[NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:completionHandler];
}
-(NSURLRequest*)createPostRequest {
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration ephemeralSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
NSMutableURLRequest* request = [[HttpRequest requestWithRelativePath:@"/photo"] toNSMutableURLRequest];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[self encodeParamsForUpload]];
//Create task
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//Handle your response here
[[NSURLSession sharedSession]invalidateAndCancel];
}];
[dataTask resume];
return request;
}
但是,当我使用NSURLSession
时,请求发送了两次,我已经在NSMutableURLRequest
行中设置了断点,但它只调用了一次
请帮助我解决此问题。您的
createPostRequest
正在创建请求并通过NSURLSession
提交。但它也会返回NSURLRequest
,然后postAsynchronousOnQueue
继续再次提交,这次是通过不推荐的NSURLConnection
删除NSURLConnection
代码,只需依靠nsursession
发出请求即可
例如:
- (void)postAsynchronousOnQueue:(NSOperationQueue*)queue completionHandler:(void (^)(NSData *, NSURLResponse*, NSError*))completionHandler {
NSURLSession *defaultSession = [NSURLSession sharedSession];
NSMutableURLRequest* request = [[HttpRequest requestWithRelativePath:@"/photo"] toNSMutableURLRequest];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[self encodeParamsForUpload]];
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//Handle your response here
[queue addOperationWithBlock:^{
completionHandler(data, response, error);
}];
}];
[dataTask resume];
}
您的
createPostRequest
正在创建请求并通过NSURLSession
提交。但它也会返回NSURLRequest
,然后postAsynchronousOnQueue
继续再次提交,这次是通过不推荐的NSURLConnection
删除NSURLConnection
代码,只需依靠nsursession
发出请求即可
例如:
- (void)postAsynchronousOnQueue:(NSOperationQueue*)queue completionHandler:(void (^)(NSData *, NSURLResponse*, NSError*))completionHandler {
NSURLSession *defaultSession = [NSURLSession sharedSession];
NSMutableURLRequest* request = [[HttpRequest requestWithRelativePath:@"/photo"] toNSMutableURLRequest];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:[self encodeParamsForUpload]];
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//Handle your response here
[queue addOperationWithBlock:^{
completionHandler(data, response, error);
}];
}];
[dataTask resume];
}
不相关,但我会避免为每个请求创建新的
NSURLSession
。我将创建它一次,并为每个请求重用它。或者只需使用sharedSession
。我还将删除nsursession
的无效性,前提是您以后可能会再次使用它。不相关,但我将避免为每个请求创建新的nsursession
。我将创建它一次,并为每个请求重用它。或者只需使用sharedSession
。我还将删除NSURLSession
的无效性,前提是您以后可能会再次使用它。