iOS)当我接近秒级时，timeIntervalSince70 的值是固定的

Question

我想更新显示每秒 2 个 nsdates 之间剩余时间的标签。

我的代码如下:

NSDate *nowDate = [NSDate date];
double diff = [campaignDate timeIntervalSince1970] - [nowDate timeIntervalSince1970];

int diff_day = diff/60/60/24 - 1; 
int diff_hour = ((int)diff/60/60)%24;
int diff_min = ((int)diff/60)%60;
int diff_sec = ((int)diff/60/60)%60;

当我登录 diff_sec 时，它总是显示 49日、时和最小值按工作顺序打印

为什么 diff_sec 会造成问题？有什么解决办法吗？

Answer 1

我认为您应该使用 NSDateComponents 来获取两天之间的天数/小时/分钟/秒数。

然后你可以像这样得到剩余时间:

NSDate *fromDate = [NSDate date];
NSDate *toDate = [NSDate dateWithTimeIntervalSinceNow:12345];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *difference = [calendar components:NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond fromDate:fromDate toDate:toDate options:0];

NSLog(@"Event in %@ days, %@:%@:%@", @(difference.day), @(difference.hour), @(difference.minute), @(difference.second));