UIAlertView runModal

发布于 2024-11-19 00:33:52 字数 823 浏览 2 评论 0原文

有没有办法从 UIAlertView 获得类似 NSAlert runModal 的行为？或者来自 UIActionSheet？

我计划仅在调试版本中使用，因此我不关心它的外观或是否使用未记录的功能。

编辑：

NSAlert 是 OS X SDK 的一部分，类似于 Win32 中的 MessageBox。它允许您同步提示用户某些内容。这是一个示例：

NSAlert * myAlert=[[NSAlert alloc] init];
[myAlert setMessgeText:@"This is my alert"];
[myAlert addButtonWithTitle:@"button 1"];
[myAlert addButtonWithTitle:@"button 2"];

switch ([myAlert runModal]) {
  case NSAlertFirstButtonReturn:
    //handle first button
    break;
  case NSAlertSecondButtonReturn:
    //handle second button
    break;
}

runModal 是一个同步函数，它显示警报并等待用户响应。它在内部运行消息循环的有限版本，但就我的应用程序的其余部分而言，世界已经停止了；没有消息，没有事件，什么都没有。

原文

Followup to Where is NSAlert.h in the iOS SDK?

Is there any way to get NSAlert runModal like behavior from a UIAlertView? Or from a UIActionSheet?

I'm planning on using only in debug builds so I'm not concerned with how it looks or if it uses undocumented functionality.

Edit:

NSAlert is part of the OS X SDK and is similar to MessageBox in Win32. It allows you to synchronously prompt the user for something. Here's an example:

NSAlert * myAlert=[[NSAlert alloc] init];
[myAlert setMessgeText:@"This is my alert"];
[myAlert addButtonWithTitle:@"button 1"];
[myAlert addButtonWithTitle:@"button 2"];

switch ([myAlert runModal]) {
  case NSAlertFirstButtonReturn:
    //handle first button
    break;
  case NSAlertSecondButtonReturn:
    //handle second button
    break;
}

runModal is a synchronous function, it shows the alert and waits for user response. Internally it is running a limited version of the message loop, but as far as the rest of my application is concerned, the world has stopped; no messages, no events, nothing.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

浅蓝的眸勾画不出的柔情 2024-11-26 00:33:55

如果您想要这种行为，您必须自己编写。小心，如果您阻塞主队列太长时间，您的应用程序将受到监视。

UIAlertView 为您提供模态行为，并且最终将以与您的自定义类相同的方式工作。您可能会考虑使用基于块的包装器来包装 UIAlertView 并允许您为按钮操作回调设置块。

回复收藏 0 原文

∞觅青森が 2024-11-26 00:33:52

它在内部运行消息循环的有限版本，但就我的应用程序的其余部分而言，世界已经停止了

只需按照您所描述的操作即可：抛出警报，然后运行事件循环直到警报视图出现被解雇了。这段代码的工作原理：

UIAlertView *alert = [[UIAlertView alloc]
        initWithTitle:@"O rlly?" message:nil delegate:nil
        cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alert show];
NSRunLoop *rl = [NSRunLoop currentRunLoop];
NSDate *d;
while ([alert isVisible]) {
    d = [[NSDate alloc] init];
    [rl runUntilDate:d];
    [d release];
}
[alert release];

Internally it is running a limited version of the message loop, but as far as the rest of my application is concerned, the world has stopped

Just do exactly what you described: throw up the alert, then run the event loop till the alert view gets dismissed. This code works:

UIAlertView *alert = [[UIAlertView alloc]
        initWithTitle:@"O rlly?" message:nil delegate:nil
        cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alert show];
NSRunLoop *rl = [NSRunLoop currentRunLoop];
NSDate *d;
while ([alert isVisible]) {
    d = [[NSDate alloc] init];
    [rl runUntilDate:d];
    [d release];
}
[alert release];

回复收藏 0 原文

~没有更多了~