Question

鉴于我的NSDate *timeRightNow是当前时间。

从现在开始，我如何找到下一个晚上8点？

因此，如果现在是晚上8:01我会抓住明天晚上8点

如果是晚上7:59，我会抓住今天晚上8点。

所以这是下一个即将到来的8点。

谢谢！

Answer 1

@Vignesh有正确的想法，但你不能只是添加秒数来约会另一天。您需要添加“一天”，因为可能会有时间变化。这是他的代码的修订版本。

NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components setHour:20];
NSDate *today8PM = [calendar dateFromComponents:components];

NSDate *next8PM;

if ([now compare:today8PM] == NSOrderedDescending) {
  NSDateComponents *oneDay = [NSDateComponents new];
  oneDay.day = 1;
  next8PM = [calendar dateByAddingComponents:oneDay toDate:today8PM  options:0]
}
else {
  next8PM = today8PM;
}

Answer 2

我会使用NSDate-Extensions。

然后您可以执行以下操作：

#import "NSDate-Utilities.h"

NSDate *next8pm;
if ([timeRightNow timeIntervalSinceDate:[timeRightNow dateAtStartOfDay]] < 16*3600)
{
    next8pm = [[timeRightNow dateAtStartOfDay] dateByAddingHours:16];
}
else
{
    next8pm = [[[timeRightNow dateAtStartOfDay] dateByAddingDays:1] dateByAddingHours:16];
}

Answer 3

此代码应该按照您的意愿执行，

NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
[components setHour:20];
NSDate *today8PM = [calendar dateFromComponents:components];

if ([now compare:today8PM] == NSOrderedDescending)
{
NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
dayComponent.day = 1;
dateToBeIncremented = [calendar dateByAddingComponents:dayComponent toDate:dateToBeIncremented options:0];
    NSLog(@"%@",dateToBeIncremented );

}
else
{
    NSLog(@"%@", today8PM );

}

从给定时间找到下一个最接近的晚上8点

3 个答案: