finding NSDate's in an NSArray that have a time of day after a given time (e.g. 8pm)?
Is there a quick way in Objective-C of identifying NSDate'开发者_如何学JAVAs in an NSArray that have a time of day after a given time (e.g. 8pm)?
I can't quite see anyway other than manually walking through each NSDate in the array and then using NSDateComponents to break out the hour/minute/second...Not even sure if there is a simple way to get the time from an NSDate in a fashion that represents a fraction of 24hours, as this might help a little. (e.g. 6pm would be 18/24 = 0.75 in this case)
There is no need to break in NSDateComponents
.
NSTimeInterval interval = [date1 timeIntervalSinceDate:date2]; if (interval > 0) { // date2 is earlier } else { // date1 is earlier }
Now you can represent your target time(8 P.M., for example) with date2 and compare all dates of array with that.
Haven't tried this myself, but I guess
- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate
is what you're looking for.
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