Question

我想知道如何在我的代码中添加1.0秒的延迟：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *homeViewController = (UIViewController *)[storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"];
[self presentViewController:homeViewController animated:YES completion:nil];

我知道你可以这样做：

[self performSelector:@selector(showModalTwo:)withObject:someNumber afterDelay:1.0f];

我只是没有这个或想要制作一个功能来segue。任何帮助都会很棒。谢谢！

Answer 1

不建议添加等待操作的延迟（即登录），而是可以使用Grand Central Dispatch

dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){
        //Background Thread
        // do you login logic here

        dispatch_async(dispatch_get_main_queue(), ^(void){
            //Main Thread : UI Updates
            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
            UIViewController *homeViewController = (UIViewController *)[storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"];
            [self presentViewController:homeViewController animated:YES completion:nil];

        });
    });

向PresentViewController添加延迟

1 个答案: