設置fireDate的固定日期？ xcode

Question

我需要設置幾個fireDates。我想知道如何設置一個特定日期和時間的鬧鐘？

Answer 1

NSDate *date = //set the date 
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1000 target:target selector:@selector(aSelector) userInfo:userInfo repeats:NO]; 
[timer setFireDate:date]; 

或

NSDate *date = //set the date 
NSTimer *timer = [[[NSTimer alloc] initWithFireDate::1000 target:target selector:@selector(aSelector) userInfo:userInfo repeats:NO] autorelease]; 
[timer setFireDate:date]; 
[[NSRunLoop currentRunLoop] addTimer:timer forMode:currentMode]; 

Answer 2

我知道它可能是姍姍來遲，但這裏是我的觀點就可以了：

NSDateComponents *dateComponents = [[NSDateComponents alloc] init]; 
[dateComponents setHour:13]; 
[dateComponents setMinute:0]; 
[dateComponents setSecond:0]; 
[dateComponents setDay:17]; 
[dateComponents setMonth:12]; 
[dateComponents setYear:2012]; 
NSCalendar *gregorian = [[NSCalendar alloc] 
        initWithCalendarIdentifier:NSGregorianCalendar]; 
NSDate *date = [gregorian dateFromComponents:components]; 

檢查這個更好的參考https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtCalendars.html