显示按钮后如何在 UIAlertView 上显示按钮
我是使用 Objective C 进行开发的新手。
我正在编写一段代码，将插件安装到我的应用程序中。它下载一个 .zip 包，解压缩并将一些数据复制到我的 sqlite 数据库中。
我有一个 UIAlertView，在应用程序下载和解压缩时显示 UIProgressView，完成后我向 UIAlertView 添加一个带有 UIAlertView 的按钮代码>addButtonWithTitle方法。
我不知道为什么我的按钮出现在 UIAlertView 的左上角。
这是我的代码的一部分：
ventana = [[UIAlertView alloc] initWithTitle:[[NSString alloc] initWithFormat: @"Instalando %@", codigo]
message:@"Por favor, no apague el dispositivo ni cierre la aplicación." delegate:nil cancelButtonTitle:nil otherButtonTitles: nil];
actividad = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
actividad.frame = CGRectMake(20, 110, 20, 20);
progreso = [[UIProgressView alloc] initWithFrame:CGRectMake(50, 115, 215, 9)];
[ventana addSubview:actividad];
[actividad startAnimating];
[ventana addSubview:progreso];
[ventana show];
-- some stuff (downloading, uncompressing, updating my UIProgressView...) --
[progreso removeFromSuperview];
[actividad removeFromSuperview];
[ventana addButtonWithTitle:@"Aceptar"];
ventana.message = @"Instalación finalizada";
我有一张图像，但我无法将其发布在这里，因为我是新用户。
任何人都知道为什么我的按钮出现在 UIAlertView (ventana) 的左上角 谢谢！
I am newbie developing with objective C.
I am working on a piece of code that installs a plugin to my application. It downloads a .zip package, uncompress it and copy some data to my sqlite database.
I have a UIAlertView that shows a UIProgressView while the app is downloading and uncompressing, when it finish I add to the UIAlertView a button with the addButtonWithTitle method.
I dont know why my button appears on the top-left corner of my UIAlertView.
This is a piece of my code:
ventana = [[UIAlertView alloc] initWithTitle:[[NSString alloc] initWithFormat: @"Instalando %@", codigo]
message:@"Por favor, no apague el dispositivo ni cierre la aplicación." delegate:nil cancelButtonTitle:nil otherButtonTitles: nil];
actividad = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
actividad.frame = CGRectMake(20, 110, 20, 20);
progreso = [[UIProgressView alloc] initWithFrame:CGRectMake(50, 115, 215, 9)];
[ventana addSubview:actividad];
[actividad startAnimating];
[ventana addSubview:progreso];
[ventana show];
-- some stuff (downloading, uncompressing, updating my UIProgressView...) --
[progreso removeFromSuperview];
[actividad removeFromSuperview];
[ventana addButtonWithTitle:@"Aceptar"];
ventana.message = @"Instalación finalizada";
I have a image but I can't post it here because I am a new user.
Anyone knows why my button appears at the top-left corner of my UIAlertView (ventana)
Thanks!
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您使用
UIAlertView的方式有点......不好。您不应该永远显示带有 0 个按钮的 UIAlertView，并且将其用作“不要关闭设备”消息是一个坏主意。警报视图的“可接受”用途是告诉用户刚刚发生了一些重要的事情。但是，如果您坚持，默认情况下应该有一个取消按钮，以便他们可以根据需要停止操作，然后在完成后添加该按钮。当尝试将按钮添加到不存在的按钮列表中时（因为您使用 0 个按钮对其进行了初始化），UIAlertView可能会感到困惑。但是，更好的方法是在通用
UIView上下载（您已经拥有）时显示进度指示器，并使用包含消息的UILabel。然后，完成后，更改标签以显示“Instalación Finalizada”消息，并在其下方显示一个按钮。我知道，它似乎只是复制您已有的内容，但我在您的描述中没有看到任何地方需要使用UIAlertView。The way you are using the
UIAlertViewis sort of... bad. You should nevershow a UIAlertView with 0 buttons, and using it as a 'don't turn off the device' message is a bad idea. The "accepted" use for the alert view is to tell the user something important has just happened. If you insist, however, you should have a cancel button in there by default so they can stop the operation if they want to, then when it's finished, add the button. TheUIAlertViewmay be confused when trying to add a button to a list of buttons that doesn't exist (because you initialized it with 0 buttons).However, the better way to go about it would be to show a progress indicator while downloading (which you have) on a general
UIViewwith aUILabelcontaining the message. Then, when it's completed, change the label to show your "Instalación finalizada" message, and display a button below it. I know, it seems like it's just replicating what you already have, but there's nowhere in your description that I see that calls for the use of aUIAlertView.