获取当前时间的前n个月的时间

代码功能：获取当前月的前三个月 及后一个月，总共五个月

- (void)getDateData {
    for (int i = 0; i < 5; i++) {
        NSDateComponents * components = [[NSDateComponents alloc] init];
        [components setMonth:(i-3)];
        NSCalendar *calendar = [NSCalendar currentCalendar];
        NSDate *nextData = [calendar dateByAddingComponents:components toDate:[NSDate date] options:NSCalendarMatchStrictly];
        NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
        formatter.dateFormat = @"yyyy.MM";
        NSString * str1 = [formatter stringFrom![4E7B95DF-84E6-499C-8F7E-FA1970265118.png](https://img.haomeiwen.com/i1787970/74484628a5b59b74.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
Date:nextData];
        [_pointArray addObject:str1];
    }
}

setMonth:值为负数，则是前n个月，若为正数，则是后n个月。还可以获取年、日、时、分、秒

4E7B95DF-84E6-499C-8F7E-FA1970265118.png