Ios 在xcode中使用AFNetworking下载文件时出错

我创建了一个有一个页面的应用程序，在这个页面中有一个按钮，当点击时，该按钮会下载文件

我可以用AFNetworking下载文件，但在我的中有错误

这是我的代码：

- (IBAction)downloads:(id)sender
{
    NSLog(@"start downloads");
    NSURLRequest *request = [NSURLRequest requestWithURL:
   [NSURL URLWithString:
   @"http://.../500x333xgalaxy-core-product-image-1tn.jpg,
                           q1367836642.pagespeed.ic.eafBYU8jUN.jpg"]];
    AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc]
                                                             initWithRequest:request];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                                                                   NSUserDomainMask, YES);
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent
                                                                        :@"filename.jpg"];

    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, 
    id responseObject) {
        NSLog(@"Successfully downloaded file to %@", path);
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];

}

此错误是：

No visible @interface 'AFURLConnectionOpretion' declares the selector
                                                         'setCompletionBlockWithSuccess'

---

这是我的下载代码

AFHTTPRequestOperation *urlConnection;
urlConnection = [[AFHTTPRequestOperation alloc] initWithRequest:request];
urlConnection.outputStream = [NSOutputStream outputStreamToFileAtPath:outputPath append:NO];
[urlConnection setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

    NSLog(@"Download Completed");


} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

    NSLog(@"Error occured while downloading");

}];

[urlConnection setDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {

}];

---

将“AFURLConnectionOperation*操作”更改为“AFHTTPRequestOperation*操作”

---

我认为这就是问题所在

使用以下行开始操作：

[operation start];

---

“AFURLConnectionOperation*操作”将此更改为“AFHTTPRequestOperation*操作”我的朋友更正了它，但我不从url下载文件！！！为什么？你的意思是仍然没有下载？检查你的url，复制粘贴到浏览器中，并检查它是否工作