Question

我想为iOS编写闹钟。

我的计算当前时间和闹钟时间之间差异的代码：

NSDate *date = picker.date;
                    NSLog(@"[date description] %@",[date description]);
                    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
                    [outputFormatter setDateFormat:@"HH:mm:ss"]; //24h time format
                    NSString *dateString = [outputFormatter stringFromDate:picker.date];
                    NSLog(@"[date description] %@",dateString);

                    NSDate *startDate = [outputFormatter dateFromString:dateString];



                    NSDate *currentTime = [NSDate date];
                    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
                    [dateFormatter setDateFormat:@"HH:mm:ss"];
                    NSString *resultString = [dateFormatter stringFromDate: currentTime];
                    NSDate *endDate = [dateFormatter dateFromString:resultString];
                    NSTimeInterval timeDifference = [endDate timeIntervalSinceDate:startDate]; 


                    double minutes = timeDifference / 60;
                    double hours = minutes / 60;
                    double seconds = timeDifference;

...导致这些变量：

startDate = 2000-01-01 06:45:26 +0000
endDate = 2000-01-01 22:46:36 +0000
seconds = 57670 (= 16.01944 hours).

如何计算28740秒的实时差异？

Answer 1

在下面的方法中传递timeDifference。它会给你几小时，几分钟和几秒钟。

- (NSString *)timeFormatted:(int)totalSeconds{
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;
return hours==0 ? [NSString stringWithFormat:@"%02d:%02d", minutes, seconds] : [NSString stringWithFormat:@"%02d:%02d:%02d",hours, minutes, seconds];
}

Answer 2

尝试以下代码：

获取NSTimeInterval小时，分钟，秒的时差：

//.......
    NSTimeInterval timeDifference = [endDate timeIntervalSinceDate:startDate];
        long ti = lroundf(timeInterval);

    int hour = ti / 3600;
    int mins = (ti % 3600) / 60;
    int secs = ti % 60;

或

从日期获取小时，分钟，秒的时差：

// Get the system calendar
NSCalendar *objCalendar = [NSCalendar currentCalendar];

// Create the NSDates
NSDate *currentTime = [[NSDate alloc] init];
NSDate *startDate = picker.date;

// Get conversion to months, days, hours, minutes
unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit;

NSDateComponents *TimeInfo = [objCalendar components:unitFlags fromDate: currentTime  toDate:startDate  options:0];

NSLog(@" %dmin %dhours %ddays %dmoths ",[TimeInfo minute], [TimeInfo hour], [TimeInfo day], [TimeInfo month]);

NSTimeInterval timeIntervalSinceDate的问题

2 个答案: