NSOperationQueue,NSInvocationOperation

NSInvocationOperation.m

- (void) clickButton 
{
    
    NSOperationQueue *queue = [NSOperationQueue new];    
    NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self 
                                                                           selector:@selector(loadDataWithOperation) 
                                                                             object:nil];
    [queue addOperation:operation]; // will start the operation    
    [operation release];
    
    [UIApplicationsharedApplication].networkActivityIndicatorVisible = YES;
}


- (void) loadDataWithOperation
{    
    NSURL *dataURL = [NSURL URLWithString:@"http://icodeblog.com/samples/nsoperation/data.plist"];
    NSArray *tmp_array = [NSArray arrayWithContentsOfURL:dataURL];
    for(NSString *str in tmp_array) {
        [self.array addObject:str];
    }
    
    [self.tableView reloadData];
    [UIApplicationsharedApplication].networkActivityIndicatorVisible = NO;
}