我是 iOS 和 Cocoa 编程的新手，今天我想构建一个小型 iOS 应用程序来测试本地通知。通知工作正常，一切都像我预期的那样工作。我唯一的问题是，该方法application:didReceivedLocalNotification不想被调用：D
实现是这样工作的：UI 有一个滑块，用户可以在其中定义一个时间值，以秒为单位。在滑块上设置值后，LocalNotification 应在 xx 秒内触发。当我按下主页按钮时，通知会准时出现。但是当应用程序在前台时，通知不会出现。我已经实现了该方法并通过在方法的开头application:didReceivedLocalNotification放置一个来测试方法的调用，但是终端上没有输出。NSLog(@"YEEEAAH");
segue 似乎也有效。当我将线放在sliderTouched 的末尾时：segue 执行。
这是我的代码：
- (IBAction)sliderTouched:(UISlider *)sender {
float seconds = [sender value];
self.secondLabel.text = [NSString stringWithFormat:@"%d sec.", (int)seconds];
UIApplication *theApplication = [UIApplication sharedApplication];
UILocalNotification * theNotification = [[UILocalNotification alloc] init];
[theApplication cancelAllLocalNotifications];
NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:(int)seconds];
theNotification.fireDate = fireDate;
theNotification.timeZone = [NSTimeZone defaultTimeZone];
theNotification.alertBody = @"Lalalala";
theNotification.soundName = UILocalNotificationDefaultSoundName;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:fireDate];
NSInteger hour = [components hour]%12;
NSInteger minute = [components minute];
NSInteger second = [components second];
self.timeLabel.text = [NSString stringWithFormat:@"%02i:%02i:%02i", hour, minute, second];
[theApplication scheduleLocalNotification:theNotification];
}
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
if (application.applicationState == UIApplicationStateActive) {
[self performSegueWithIdentifier:@"modalView" sender:nil];
}
}