在 Objective-C 中添加两个 NSDate

Question

I have two NSDates with this format : "Hms" and I want to do an addition of this two dates to compare the result with my current time on my phone. I have all the information as you can see bellow :

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"H:m:s"];
    NSDate *start = [dateFormat dateFromString:NextTVS.startTime];
    NSDate *duration = [dateFormat dateFromString:NextTVS.duration];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *date = [NSDate date];
    [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) fromDate:date];

However I don't know how to add start and duration.

Thanks for your help

Answer 1

Use the dateByAddingComponents method of the NSCalendar class like so:

NSDateComponents *comps = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) fromDate:date];
NSDate *newDate = [calendar dateByAddingComponents: comps toDate: date options:0];