IOS gets the date n months after a date, and ios gets the date

IOS gets the date n months after a date, and ios gets the date
1. Give a time and a number. The positive number is the next n months, and the negative number is the previous n months;

 1 -(NSDate *)getPriousorLaterDateFromDate:(NSDate *)date withMonth:(NSInteger)month 2   3 { 4   5     NSDateComponents *comps = [[NSDateComponents alloc] init]; 6   7     [comps setMonth:month]; 8   9     NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];10  11     NSDate *mDate = [calender dateByAddingComponents:comps toDate:date options:0];12  13  14     return mDate;15  16 }

 

2. Set the year, month, and day you want to increase or decrease to get a new date. The above indicates to get the date of the month before mydate. If it is set to + 1, it is the date after one month, and so on.

 1 - (NSDate *)getLaterDateFromDate:(NSDate *)date withYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day { 2     NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; 3   4     NSDateComponents *comps = nil; 5   6     comps = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date]; 7   8     NSDateComponents *adcomps = [[NSDateComponents alloc] init]; 9  10     [adcomps setYear:year];11  12     [adcomps setMonth:month];13  14     [adcomps setDay:day];15  16     NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:date options:0];17  18     return newdate;19 }