将浮点数转换为 NSDate
我想将浮点数转换为 NSDate
我使用以下方法将 NSDate 转换为浮点数：
// Turn the date into Integers
NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:nsdate_wakeTime];
NSInteger hour = [dateComponents hour];
NSInteger min = [dateComponents minute];
//Convert the time in 24:60 to x.x format.
float myTime = hour + min/60;
在对 mytime 变量执行一些数学操作后，我得到了相同浮点数格式的许多其他时间。
如何将 float 转换为 NSDate？
谢谢！
I want to convert a float to a NSDate
I converted a NSDate into a float using this:
// Turn the date into Integers
NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:nsdate_wakeTime];
NSInteger hour = [dateComponents hour];
NSInteger min = [dateComponents minute];
//Convert the time in 24:60 to x.x format.
float myTime = hour + min/60;
after some math stuff I do on the mytime variable i get a bunch of other times in the same float format.
How do I turn a float into a NSDate?
Thanks!
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如果将计算出的时间转换为秒（例如 mytime * 60），则可以使用 dateWithTimeIntervalSinceReferenceDate: 来返回到 NSDate。 从您正在进行的数学计算来看，此处引用的日期似乎是相关日期的 00:00。 正如杰森提到的，可能有更好的方法来完成您想要完成的任务。
另外，如果您确实想要分钟数，则需要将“myTime”计算更改为除以 60.0； 您的示例代码将小于 60 的整数值除以整数值 60，该值始终为 0。
If you convert the time you've computed to seconds (so, mytime * 60), then you can use
dateWithTimeIntervalSinceReferenceDate:to get back to anNSDate. From the math you are doing, it looks like the referenced date here would be 00:00 for the day in question. As Jason mentioned though, there's probably a better way to do what you are trying to accomplish.Also, you need to change your "myTime" computation to dividing by 60.0 if you actually want the minutes; your sample code is dividing an integer value less than 60 by the integer value 60, which will always be 0.