ios - Getting two dates as substrings and store them in separate strings

Question

In my app I have a string - "contest will start from dd/mm/yyyy to dd/mm/yyyy" I want both of the dates separately so I need a way to store these dates in two different strings.

Answer 1

您可以使用正则表达式来做到这一点（半明目张胆地改编自这里）。

NSString *string                = @"contest will start from 10/11/2012 to 12/11/2012";

NSRegularExpression *regex      = [NSRegularExpression regularExpressionWithPattern:@"from (.*) to (.*)"
                                                                            options:0
                                                                              error:NULL];
NSTextCheckingResult *results   = [regex firstMatchInString:string
                                                    options:0
                                                      range:NSMakeRange(0, [string length])];
NSString *date1                 = [string substringWithRange:[results rangeAtIndex:1]];
NSString *date2                 = [string substringWithRange:[results rangeAtIndex:2]];

Answer 2

NSString *dateString = @"contest will start from dd/mm/yyyy to dd/mm/yyyy";
NSArray *components = [dateString componentsSeparatedByString:@"to"];

NSString *firstDate = [[components objectAtIndex:0] stringByReplacingOccurrencesOfString:@"contest will start from "];
NSString *secondDate = [[components objectAtIndex:1] stringByReplacingOccurrencesOfString:@" "];

Answer 3

    unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit;
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:units fromDate: date];

NSInteger year = [components year];
NSInteger month = [components month];
NSInteger day = [components day];

NSString *together = [NSString stringWithFormat:@"%i - %i - %i", day, month, year];