How to cancel multiparts uploading file inbetween ios(如何取消后台线程)

Question

你好，我正在使用此代码以多部分格式将图像上传到服务器。以及所有工作文件。但是根据我的要求，如果图像数据很重（大），那么我想取消中间的上传。

我的密码是

 NSString *imagePostUrl = [NSString stringWithFormat:@"%@/users/%@/profilepic",Kwebservices,[[NSUserDefaults standardUserDefaults] valueForKey:@"l_userid"]];
//
NSString *fileName = [NSString stringWithFormat:@"profilePic%ld%c%c.png", (long)[[NSDate date] timeIntervalSince1970], arc4random_uniform(26) + 'a', arc4random_uniform(26) + 'a'];


AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:[NSURL URLWithString:@"http://server.url"]];


NSDictionary *parameters = @{@"":@""};
AFJSONResponseSerializer *responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
[manager setResponseSerializer:responseSerializer];
manager.securityPolicy.allowInvalidCertificates = YES;

manager.responseSerializer.acceptableContentTypes = [manager.responseSerializer.acceptableContentTypes setByAddingObject:@"text/html"];

AFHTTPRequestOperation *op = [manager POST:imagePostUrl parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

    [formData appendPartWithFileData:imagedata name:fileName fileName:@"photo.jpg" mimeType:@"image/jpeg"];


} success:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Success: %@ ***** %@", operation.responseString, responseObject);

    NSURL *imageURL = [NSURL URLWithString:imagestr1];
    imageViewProfile.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:imageURL]];

    [kappDelegate HideIndicator];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Error: %@ ***** %@", operation.responseString, error);

    [HelperAlert alertWithOneBtn:AlertTitle description:@"Failed to upload selected profile picture" okBtn:OkButtonTitle];

    [kappDelegate HideIndicator];

    return ;
}];
[op start];

如何在中途停止上传。

Answer 1

[(AFHTTPRequestOperationManager*)manager.operationQueue cancelAllOperations];

Answer 2

您可以保留对操作的引用并调用NSOperation方法cancel。

有关如何处理此问题的更多信息：

步骤：

声明属性：@property (strong, nonatomic) AFHTTPRequestOperation *imagePostOperation;
将代码中的属性声明替换为 self.imagePostOperation = [manager POST:imagePostUrl ...
当你想取消操作时：[self.imagePostOperation cancel]
在操作 succes/failure 回调块中，检查 [operation isCancelled] 以管理该案例。

How to cancel multiparts uploading file inbetween ios(如何取消后台线程)

How to cancel multiparts uploading file inbetween ios(how to cancel background thread)

multithreading

multipartform-data

objective-c

image-uploading

ios