在類中，進行編輯下面的代碼：

NSLog(@"main thread begin...");

[self performSelectorInBackground:@selector(doSomething:) withObject:nil];

NSLog(@"main thread end.....");

- (void) doSomething:(id)sender

{

NSLog( @"one thread begin..." );

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

for (int i=0; i<self.StarName_Final.count; i++) {

[self SaveToDataBase:[StarName_Final objectAtIndex:i]];

}

NSLog( @"one thread end...

[pool release];

}