MBProgressHUD 画不出来解决办法
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- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES]; hud.dimBackground = YES;//block main线程 代码原本在此， 但因为这个方法(块)执行完之前， 画图的代码没有机会执行，所以MBProgressHUD没法被画出来， //所以要想办法 让这段代码执行完，有画图的机会，然后在回到主线程去执行 那种必须在主线程执行的代码（pushViewController） dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{ dispatch_async(dispatch_get_main_queue(), ^{ NSString *filename = [[self fileList]objectAtIndex:indexPath.row]; ViewController *browserController = [[ViewController alloc] initWithFileName:filename]; browserController.title = filename ; [[self navigationController] pushViewController:browserController animated:YES]; [browserController release]; [MBProgressHUD hideHUDForView:self.navigationController.view animated:YES]; }); });}