我有两个日期是按下按钮设置的。它们存储在一个继承自NSObject的自定义对象中。
属性:
@property (nonatomic, strong) NSDate *firstDate;
@property (nonatomic, strong) NSDate *secondDate;
自定义getter和setter方法:
- (void)setFirstDate:(float)firstDate {
_firstDate = [self dateByOmittingSeconds:firstDate];
}
- (void)setSecondDate:(float)secondDate {
_secondDate = [self dateByOmittingSeconds:secondDate];
}
- (NSDate *)firstDate {
return [self dateByOmittingSeconds:_firstDate];
}
- (NSDate *)secondDate {
return [self dateByOmittingSeconds:_secondDate];
}
删除NSDate的秒部分的功能:
-(NSDate *)dateByOmittingSeconds:(NSDate *)date
{
// Setup an NSCalendar
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];
// Setup NSDateComponents
NSDateComponents *components = [gregorianCalendar components: NSUIntegerMax fromDate: date];
// Set the seconds
[components setSecond:00];
return [gregorianCalendar dateFromComponents: components];
}
firstDate 08:00 ,secondDate 13:00 ,两者都是今天设置的。
我获取两个日期之间的距离并将其格式化为:
NSString *myString = [self timeFormatted:[currentModel.secondDate timeIntervalSinceDate:currentModel.firstDate]];
- (NSString *)timeFormatted:(int)totalSeconds
{
// int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;
return [NSString stringWithFormat:@"%luh %lum", (unsigned long)hours, (unsigned long)minutes];
}
但它报告 4h 59m , 17999.254732秒。
有没有人知道为什么会这样?
谢谢!
答案 0 :(得分:1)
问题不是timeIntervalSinceDate
,而是你的问题
dateByOmittingSeconds
方法未正确截断
到秒。原因是second
不是NSDateComponents
中的最小单位。
还有nanosecond
,如果你将其设置为零
[components setSecond:0];
[components setNanosecond:0];
然后它将按预期工作。
更简单的解决方案是使用rangeOfUnit
:
-(NSDate *)dateByOmittingSeconds:(NSDate *)date
{
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian];
NSDate *result;
[gregorianCalendar rangeOfUnit:NSCalendarUnitSecond startDate:&result interval:nil forDate:date];
return result;
}