怎么在程序中坚持一下？

Question

我从Facebook获取数据，在获取数据期间，需要几毫秒或一秒钟。我希望保持完整，直到获取数据。

如何为此编写代码？

Answer 1

- (void)viewDidLoad 
{
    [self performSelectorInBackground:@selector(startFatching) withObject:nil];
        [super viewDidLoad];
}
- (void) startFatching
{
    [self performSelectorOnMainThread:@selector(startIndicator) withObject:nil waitUntilDone:NO];

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 

        // your code

       [self performSelectorOnMainThread:@selector(stopIndicator) withObject:nil waitUntilDone:NO];
[pool release];
}

- (void) startIndicator
{
    av.hidesWhenStopped = YES;
    [av startAnimating];
}

- (void) stoprIndicator
{
   [av stopAnimating];
}

希望这会给你一些想法