我想在两个日期之间生成一个随机日期,例如从今天到今天之间的随机日期.我怎么做？
UPDATE
使用答案中的信息,我想出了这种方法,我经常使用：
// Generate a random date sometime between Now and n days before day.
// Also,generate a random time to go with the day while we are at it.
- (NSDate *) generaterandomDateWithinDaysBeforetoday:(NSInteger)days
{
int r1 = arc4random_uniform(days);
int r2 = arc4random_uniform(23);
int r3 = arc4random_uniform(59);
NSDate *today = [NSDate new];
NSCalendar *gregorian =
[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *offsetComponents = [NSDateComponents new];
[offsetComponents setDay:(r1*-1)];
[offsetComponents setHour:r2];
[offsetComponents setMinute:r3];
NSDate *rndDate1 = [gregorian dateByAddingComponents:offsetComponents
toDate:today options:0];
return rndDate1;
}
解决方法
>生成1到60之间的随机数
int r = arc4random_uniform(60) + 1; // Usage : arc4random_uniform(hi - lo + 1) + lo
>获取当前日期
[NSDate date];
>使用NSDateComponents从你的天数组件中减去随机数,并生成一个新的日期.