Question

我正在开发一个上传多个文件的应用。要上传，我使用AFHTTPRequestOperation。它成功运行，但如果我锁定并解锁屏幕后，它就会停止上传文件。

上传文件的代码在这里

NSUserDefaults *defaultUser = [NSUserDefaults standardUserDefaults];
NSString *userId = [defaultUser stringForKey:@"UserId"];

AFHTTPClient *client= [AFHTTPClient clientWithBaseURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",UploadURL,userId]]];
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:nil];
NSMutableURLRequest *request = [client multipartFormRequestWithMethod:@"POST" path:nil parameters:params constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
        [formData appendPartWithFileData: data name:@"f" fileName:[NSString stringWithFormat:@"%d_image.jpeg",rand()] mimeType:@"image/jpeg"];
    }];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {}];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"error: %@", [operation error]);
        if(error.code == -1001){
        UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"Error!"
                                                          message:@"The request timed out." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [myAlert show];
        }
    }];


[operation start];

任何人都可以给我建议处理这种情况。

感谢。

Answer 1

（1）添加此代码：

[operation setShouldExecuteAsBackgroundTaskWithExpirationHandler:^{
    // Handle iOS shutting you down (possibly make a note of where you
    // stopped so you can resume later)
}];

（2）改变这一行：

[operation start];

到

[client enqueueHTTPRequestOperation:operation];

（3）保留对AFHTTPClient的强引用（这通常是针对具有单例模式的AFHTTPClient完成的），这样您的操作就不会被解除分配

在待机模式后AFHTTPRequestOperation不起作用

1 个答案: