将 MBProgressHUD 与两个类集成

Question

当我下载和处理一些数据时，我正在尝试将 MBProgressHUD 正确集成到项目中。如果我问愚蠢的事情，请原谅我的无知，但我是一个十足的菜鸟...

我有一个“Data”类正在处理我的 HTTPRequests，所以我认为这里是放置一些东西的正确位置：

-(void)resolve
{
    // Create the request.
    NSURLRequest *theRequest=[NSURLRequest requestWithURL:[[NSURL alloc] initWithString:[self url]]
                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                          timeoutInterval:60.0];
    NSLog(@"Resolving content from: %@",[self url]);
    // create the connection with the request
    // and start loading the data
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if (theConnection) {
        // Create the NSMutableData to hold the received data.
        // receivedData is an instance variable declared elsewhere.
        receivedData = [[NSMutableData data] retain];
    } else {
        NSLog(@"Content - resolve: connection failed");
    }

    // Here is the part that it makes me crazy...

    HUD = [[MBProgressHUD showHUDAddedTo:self.view animated:YES] retain];

    return;

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // This method is called when the server has determined that it
    // has enough information to create the NSURLResponse.

    // It can be called multiple times, for example in the case of a
    // redirect, so each time we reset the data.

    // receivedData is an instance variable declared elsewhere.
    expectedLength = [response expectedContentLength];
    currentLength = 0;
    HUD.mode = MBProgressHUDModeDeterminate;
    [receivedData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    currentLength += [data length];
    HUD.progress = currentLength / (float)expectedLength;

    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.

    [receivedData appendData:data];
    return;
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    [HUD hide:YES];
    // release the connection, and the data object
    [connection release];
    // receivedData is declared as a method instance elsewhere
    [receivedData release];

    // inform the user
    NSLog(@"Content - Connection failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
    return;
}

现在我知道将“showHUDaddTo”放在 -(void)resolve 中不是正确的方法...

我使用这样的 IBaction 从视图控制器调用此数据函数：

-(IBAction) btnClicked:(id) sender {
    if ([[issue status] intValue] == 1 ) // issue is not downloaded
    {

        [(Content *)[issue content] resolve];
        //HUD = [[MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES] retain];




    }
    else // issue is downloaded - needs to be archived
    {
        NSError * error = nil;
        [[NSFileManager defaultManager] removeItemAtPath:[(Content *)[issue content] path]  error:&error];
        if (error) {
            // implement error handling

        }
        else {
            Content * c = (Content *)[issue content];
            [c setPath:@""];
            [issue setStatus:[NSNumber numberWithInt:1]];
            [buttonView setTitle:@"Download" forState:UIControlStateNormal];
            [gotoIssue setTitle:@"..." forState:UIControlStateNormal];


            // notify all interested parties of the archived content
            [[NSNotificationCenter defaultCenter] postNotificationName:@"contentArchived" object:self]; // make sure its persisted!

        }



    }
}

简单地说：我想调用所有 MBProgressHUD 内容从当我按下 IssueController.m 文件中的下载按钮时，我的 Conten.m 文件。我想你现在明白我的问题出在哪里：我不是编码员;-)任何帮助都是值得赞赏的。

干杯，

桑德尔

Answer 1

我会尝试使用 HUD 方法 showWhileExecuting。用一种新方法包装您的调用并调用它来下载您的信息。当您的方法完成时，您的 HUD 也会完成。

另外，您保留对 HUD 的电话有什么原因吗？我以前没有见过这种情况，我不确定您是否需要保留它们，因为它们是自动释放的。