在加载时显示等待的警报视图 [英] Showing Waiting Alert View At Load

问题描述

我希望在我的应用启动时显示警报视图约5秒钟，然后根据后台进程的结果，它将显示另一个警报视图.

I would like when my app starts for it to show an Alert view for about 5 seconds, then depending on the outcome of a background process, it will show another Alert view.

我遇到的问题是，当我尝试使用睡眠来等待后台进程发生时.第一个警报不显示，请等待5秒钟.该应用程序显示该应用程序的第一个视图，然后在5秒钟后短暂显示第一个警报.

The problem I am experiencing is that when I try to use Sleep to wait for a background process to occur. The first Alert does not show and wait the 5 seconds. The app shows the first view of the app, and then after 5 seconds the first Alert shows briefly.

要执行自己想要的事情，我需要做些什么.

What do I need to do to perform what I wish.

这是我的代码.

- (void)viewDidAppear:(BOOL)animated
{
    SSGlobalSettings *connSettings = [SSGlobalSettings sharedManager];

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Connecting" message:@"Please wait, while your device connects" delegate:Nil cancelButtonTitle:nil otherButtonTitles: nil];
    [alertView show];

    [NSThread sleepForTimeInterval:5.0f];

    [alertView dismissWithClickedButtonIndex: alertView.cancelButtonIndex animated: YES];

    if ([connSettings.connectionStatus  isEqual: @"Not Found"])
    {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Connection Failed" message:@"Cannot find your device on the network" delegate:Nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alertView show];
    }
    else
    {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Connection Success" message:@"WYour device has been found on the network" delegate:@"OK" cancelButtonTitle:nil otherButtonTitles: nil];
        [alertView show];
    }
}

推荐答案

不要在主线程上使用sleep.曾经.也不要从后台线程更新UI.

Don't use sleep on the main thread. Ever. Also don't update UI from a background thread.

您要做的是在主线程上显示警报并返回.

What you want to do is to display your alert on the main thread and return.

然后，当您的网络代码完成时，让它向主线程发送一条消息.在主线程中，当您收到已完成的通知时，请删除警报.

Then, when your networking code completes, have it send a message to the main thread. In the main thread, when you receive a notice that it's done, remove the alert.

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