特定时间的 iPhone 本地通知答案

【问题标题】：iPhone local notification at particular time特定时间的 iPhone 本地通知
【发布时间】：2013-04-10 02:31:40
【问题描述】：

我想每周晚上 10 点（不限国家/地区）发出通知。我需要使用时区吗？目前我正在使用下面的代码每周触发通知，但是如何在晚上 10 点准确触发通知。

NSDate *date = [NSDate date];
NSDate* myNewDate = [date dateByAddingTimeInterval:7*24*60*60];    
UILocalNotification *localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = myNewDate;
localNotification.timeZone = [NSTimeZone defaultTimeZone];
localNotification.repeatInterval = NSWeekCalendarUnit;
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
[localNotification release];

【问题讨论】：

标签： iphone notifications

【解决方案1】：

我认为将您的 fireDate 设置为您想要收到通知的那一天（而不是“一周后”）的 22:00 会满足您的需求。您可能希望使用 NSCalendar 来执行此操作。

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
NSDate *currentDate = [NSDate date];
NSDate *fireDate = nil;

[dateComponents setDay:3];  // ...or whatever day.
[dateComponents setHour:22];
[dateComponents setMinute:0];

fireDate = [gregorian dateByAddingComponents:dateComponents
                                      toDate:currentDate 
                                     options:0];

[localNotification setFireDate:fireDate];
[dateComponents release];

【讨论】：

【解决方案2】：

我进行了这些更改并且效果很好...

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
NSDate *currentDate = [NSDate date];
NSDate *fireDate = nil;

//Getting current Hour
NSDateComponents *components = [[NSCalendar currentCalendar] components:(kCFCalendarUnitHour | kCFCalendarUnitMinute) fromDate:currentDate];
NSInteger hour = [components hour];
NSInteger minute = [components minute];

[dateComponents setDay:7];//After 1 week
[dateComponents setHour:22-hour-1];  //Calculating Remaining time for 10PM && "-1" because i am adding 60 min
[dateComponents setMinute:60-minute];

//Adding remaining time to current Time
fireDate = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents
                                              toDate:currentDate 
                                             options:0];
[localNotification setFireDate:fireDate];

【讨论】：