如何计算当前的时间的第n天的所有日期

#pragma mark--计算第n天的所有日期

-(void)calculation{

NSTimeInterval secondsPerDay = 24 * 60 * 60;

NSDate * today = [NSDate date];

NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];

[myDateFormatter setDateFormat:@"yyyy-MM-dd"];

for (int days = 0; days < 30; days ++) {

NSString *dateString = [myDateFormatter stringFromDate:[today dateByAddingTimeInterval:days * secondsPerDay]];

[self.titileArray addObject:dateString];

}

}