我试图使用设置包来安排UILocalNotification.在设置中,您可以选择是否要每天通知(每天1天),每2天1次,仅限星期日或从不.
这是我使用的代码(这一切都在AppDelegate.m中)：
-(void)defaultsChanged:(NSNotification *)notification {
[[UIApplication sharedApplication] cancelAllLocalNotifications];
[[NSUserDefaults standardUserDefaults]synchronize];
NSString *testValue = [[NSUserDefaults standardUserDefaults] stringForKey:@"multi_preference"];
NSLog(@"%@",testValue);
NSDate *today = [NSDate date];
NSCalendar* calendar = [NSCalendar currentCalendar];
NSDateComponents* compoNents = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:today]; // Get necessary date components
[compoNents month];[compoNents day];
NSDictionary *dictToday= [self getDataFromdate : [compoNents day] month:[compoNents month]];
if ([testValue isEqualToString:@"one"]){
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:20];
localNotification.alertAction = @"View";
localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
localNotification.repeatInterval = NSDayCalendarUnit;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];
}
if (testValue==Nil){
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:20];
localNotification.alertAction = @"View";
localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
localNotification.repeatInterval = NSDayCalendarUnit;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];
}
if ([testValue isEqualToString:@"two"]){
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = [[NSDate date]dateByAddingTimeInterval:86401];
localNotification.alertAction = @"View";
localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
localNotification.repeatInterval = NSDayCalendarUnit;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];
}
if ([testValue isEqualToString:@"three"]){
NSDate *today2 = [[NSDate alloc] init];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
// Get the weekday component of the current date
NSDateComponents *weekdayComponents = [gregorian components:NSWeekdayCalendarUnit
fromDate:today2];
/*
Create a date components to represent the number of days to subtract from the current date.
The weekday value for Sunday in the Gregorian calendar is 1,so subtract 1 from the number of days to subtract from the date in question. (If today is Sunday,subtract 0 days.)
*/
NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
[componentsToSubtract setDay: 0 - ([weekdayComponents weekday] - 1)];
NSDate *beginningOfWeek = [gregorian dateByAddingComponents:componentsToSubtract
toDate:today2 options:0];
/*
Optional step:
beginningOfWeek now has the same hour,minute,and second as the original date (today).
To normalize to midnight,extract the year,month,and day components and create a new date from those components.
*/
NSDateComponents *components =
[gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit |
NSDayCalendarUnit) fromDate: beginningOfWeek];
beginningOfWeek = [gregorian dateFromComponents:components];
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = beginningOfWeek;
localNotification.alertAction = @"View";
localNotification.alertBody = [dictToday objectForKey:@"saint_description"];
localNotification.repeatInterval = NSWeekdayCalendarUnit;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];
}
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(defaultsChanged:)
name:NSUserDefaultsDidChangeNotification
object:nil];
UILocalNotification *locationNotification = [launchOptions objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
if (locationNotification) {
// Set icon badge number to zero
application.applicationIconBadgeNumber = 0;
}
return yes;
}
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Saint"
message:notification.alertBody
delegate:self cancelButtonTitle:@"OK"
otherButtonTitles:nil];
if (notification.alertBody!=Nil)
[alert show];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self];
// Set icon badge number to zero
application.applicationIconBadgeNumber = 0;
}
解决方法
您似乎在用户更改首选项时调度通知.但是,您永远不会取消调度以前安排的通知,这就是为什么您会在一段时间内观察突发的通知,这些通知的时间将完全对应于您每天或两天前反复更改设置的时间.
您计划的通知是与您要修改的通知集不同的对象.不幸的是,UILocalNotifications没有标识符令牌.
但是,您可以在收到带有[[UIApplication sharedApplication] cancelAllLocalNotifications]的defaultsChanged：消息时取消调度所有以前的通知;在你重新安排之前.这将解决您的问题.
还要仔细查看this solution,建议即使在启动时也可以取消并重新安排通知,以避免在用户重新安装应用程序时发生突发或重复通知.
