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我正在尝试使用上传图像backgroundSessionConfiguration并将NSURLSessionUploadTask实时上传过程保持在应用程序后台模式。

但是当我使用时backgroundSessionConfiguration，NSURLSessionUploadTask在使用defaultSessionConfiguration它调用委托方法时不会调用委托方法。

这是代码。

//Create a file to upload
    UIImage *image = [UIImage imageNamed:@"1.jpg"];
    NSData *imageData = UIImagePNGRepresentation(image);
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *URLs = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
    NSString *documentsDirectory = [[URLs objectAtIndex:0] absoluteString];

NSString *filePath = [documentsDirectory stringByAppendingString:@"testfile.jpg"];
[imageData writeToFile:filePath atomically:YES];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://file.upload/destination"]];
[request setHTTPMethod:@"PUT"];

NSURLSessionConfiguration *config = [NSURLSessionConfiguration backgroundSessionConfiguration: [NSString stringWithFormat:@"testSession.foo.com"]];
config.HTTPMaximumConnectionsPerHost = 1;
session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];


NSURLSessionUploadTask *uploadTask = [self.session uploadTaskWithRequest:request fromFile:[NSURL URLWithString:filePath]];
[uploadTask resume];
NSLog(@"==%ld",uploadTask.state);

如果我更改backgroundSessionConfiguration为defaultSessionConfiguration，委托方法将调用。

请帮助我了解我缺少什么。

谢谢，尼丁

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