You can use NSCalendar method dateFromComponents: passing a properly initiated NSDateComponents object
NSDateComponents *components = [[NSCalendar currentCalendar] components: NSYearCalendarUnit | NSWeekOfYearCalendarUnit fromDate:[NSDate date]];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setWeekOfYear:[components weekOfYear] + 1];
[comps setWeekday:1];
[comps setYear:[components year]];
NSCalendar *calendar = [NSCalendar currentCalendar];
[calendar setFirstWeekday:2]; //This needs to be checked, which day is monday?
NSDate *date = [calendar dateFromComponents:comps];
Something along these lines could work (blindly typed)