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我想遷移到NSURLSession，以便我可以發送多個圖像到我的服務器，並停止當我得到所需的響應。但我的完成塊永遠不會被調用。如果能夠正確地進行遷移，請告訴我，謝謝。從NSURLConnection遷移到NSURLSession
這裏是我的舊代碼，工程精細
-(void) sendImgWithText:(UIImage*)img
{
NSURL *requestURL = [NSURL URLWithString:@"Some URL"];
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"*****";
NSString *lineEnd = @"\r\n";
NSString *twoHyphens = @"--";
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
// post body
NSMutableData *body = [NSMutableData data];
// add params (all params are strings)
// UIImage *imgColor = [UIImage imageNamed:@"9.jpg"];
UIImage * imageToPost = [[UIImage alloc] init];
UIImageWriteToSavedPhotosAlbum(imageToPost, nil, nil, nil);
NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0);
if (imageData) {
[body appendData:[[NSString stringWithFormat:@"%@%@%@", twoHyphens,boundary, lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"test.jpg\"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:@"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
}
[body appendData:[[NSString stringWithFormat:@"%@%@%@%@", twoHyphens,boundary, twoHyphens,lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
NSLog(@"%@",requestURL);
NSLog(@"%f,%f",imageToPost.size.height,imageToPost.size.height);
// set URL
[request setURL:requestURL];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
這裏是版本（我得到了大部分來自其他堆棧溢出文章）
- (void) serverRequestWithImage:(UIImage *)img completion:(void (^)(id responseObject, NSError *error))completion
{
NSURL *requestURL = [NSURL URLWithString:@"Some URL"];
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:30];
[request setHTTPMethod:@"POST"];
NSString *boundary = @"*****";
NSString *lineEnd = @"\r\n";
NSString *twoHyphens = @"--";
// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];
// post body
NSMutableData *body = [NSMutableData data];
UIImage * imageToPost = [[UIImage alloc] init];
imageToPost = img;
NSData *imageData = UIImageJPEGRepresentation(imageToPost, 1.0);
if (imageData) {
[body appendData:[[NSString stringWithFormat:@"%@%@%@", twoHyphens,boundary, lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"uploadedfile\"; filename=\"test.jpg\"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:imageData];
[body appendData:[[NSString stringWithFormat:@"%@",lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
}
[body appendData:[[NSString stringWithFormat:@"%@%@%@%@", twoHyphens,boundary, twoHyphens,lineEnd] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];
// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%d", [body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
NSLog(@"%@",requestURL);
NSLog(@"%f,%f",imageToPost.size.height,imageToPost.size.height);
// set URL
[request setURL:requestURL];
NSURLSessionTask *task =
[session
dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
// report any network-related errors
NSLog(@"Got Response 1");
if (!data) {
if (completion) {
dispatch_async(dispatch_get_main_queue(), ^{
completion(nil, error);
});
}
return;
}
// report any errors parsing the JSON
NSError *parseError = nil;
_responseData = [NSMutableData dataWithData:data];
if (_responseData) {
if (completion) {
dispatch_async(dispatch_get_main_queue(), ^{
completion(nil, parseError);
});
}
return;
}
// if everything is ok, then just return the JSON object
if (completion) {
dispatch_async(dispatch_get_main_queue(), ^{
completion(_returnedData, nil);
});
}
}];
[task resume];
}
這裏是我的電話的方法從其他類
- (IBAction)GetData:(id)sender
{
[_imageView setImage:[UIImage imageNamed:@"9.jpg"]];
msg = [[Message alloc] init];
[msg initData];
msg.delegate=self;
[msg serverRequestWithImage:_imageView.image completion:^(id responseObject, NSError *error)
{
if (responseObject) {
// do what you want with the response object here
NSLog(@"Got Data");
} else {
NSLog(@"%s: serverRequest error: %@", __FUNCTION__, error);
}
}];
}
確定'從線session''NSURLSessionTask *任務= [會議dataTaskWithRequest：請求completionHandler：^（NSData的*數據，NSURLResponse *響應，NSError *錯誤）'初始化？ – Avt
使用'NSURLSession'會自動將您的應用程序部署目標提升到ios 7.0。你確定你需要它嗎？ –
@Avt是的，我有一個initData方法，我從msg類調用 - （void）initData { session = [[NSURLSession alloc] init]; _returnedData = [[NSMutableData alloc] init]; } – user2067051