xcode 在 iPhone 应用程序在后台运行时显示弹出窗口 (UIAlertView)
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show a popup (UIAlertView) while iPhone app is running in background
提问by Haris Farooqui
I am new to iphone app development.
我是 iphone 应用程序开发的新手。
My question is how can I show a popup (UIAlertView) while my app is running in background? I am using xcode 4.2 for ios 6 I am unable to find a satisfactory answer over the internet. Can someone please help me with this?
我的问题是如何在我的应用程序在后台运行时显示弹出窗口 (UIAlertView)？我将 xcode 4.2 用于 ios 6 我无法通过互联网找到满意的答案。有人可以帮我解决这个问题吗？
- (void)applicationDidEnterBackground:(UIApplication *)application
{
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSTimer* t = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(doBackgroundProcessing) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:t forMode:NSDefaultRunLoopMode];
[[NSRunLoop currentRunLoop] run];
});
}
}
- (void) doBackgroundProcessing
{
global = [lMGlobal getInstance];
while(TRUE)
{
[self showAlertFor:@"Hello" andMessage:@"Wake up"];
[NSThread sleepUntilDate:[lMGlobal getSleepDuration]];
}
}
- (void) showAlertFor:(NSString *)title andMessage:(NSString*)message
{
UIAlertView *alertDialog;
alertDialog = [[UIAlertView alloc]
initWithTitle:title
message:message
delegate: self
cancelButtonTitle: nil
otherButtonTitles: @"Mute", nil];
[alertDialog
performSelector:@selector(show)
onThread:[NSThread mainThread]
withObject:nil
waitUntilDone:NO];
[alertDialog release];
}
回答by David Brunow
While you cannot show a UIAlertView, you could show a UILocalNotification. Your code could look something like this:
虽然您无法显示 UIAlertView，但您可以显示 UILocalNotification。您的代码可能如下所示：
backupAlarm = [[UILocalNotification alloc] init];
backupAlarm.fireDate = alarmTime;
backupAlarm.timeZone = [NSTimeZone systemTimeZone];
backupAlarm.alertBody = @"Good morning, time to wake up.";
backupAlarm.alertAction = @"Show me";
backupAlarm.soundName = UILocalNotificationDefaultSoundName;
回答by username tbd
It is not possible to have your app show a UIAlertViewwhile running in the background.
您的应用程序UIAlertView在后台运行时无法显示。
回答by Daij-Djan
I dont think you can do it directly BUT you can fire a UILocalNotification!
我不认为您可以直接执行此操作，但是您可以触发 UILocalNotification！
回答by Lisarien
Furthemore the @DavidBrunow 's response, you have to schedule the configured local notification by:
此外，@DavidBrunow 的响应，您必须通过以下方式安排配置的本地通知：
[[UIApplication sharedApplication] scheduleLocalNotification: backupAlarm];
