How to convert NSArray to NSDate - ios

Question

I am having an array which having a date. I want to convert the array into NSDate. Then converted NSDate are stored in an another array.This is my array.
uniqueItems (
"2015-02-17",
"2015-02-09",
"2015-02-02",
"2015-01-27",
"2015-01-19",
"2015-01-12"
)
How to convert this array to NSDate, And store in to another array. Help me in coding.

Answer 1

Suppose you have an array as below:
NSArray *ary = [NSArray arrayWithObjects:#"2015-02-17",#"2015-02-09",#"2015-02-02", nil];
To convert each string into date:-
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"dd-MM-yyyy"];
for(int i =0;i<ary.count;i++){
NSDate *d = [[NSDate alloc]init];
d = [dateFormatter dateFromString:ary[i]];
}
If you want to use NSDateFormate, you can also use in loop also.

Answer 2

First convert your NSString to NSDate
NSArray *arrr = #[ #"2015-02-17",
#"2015-02-09",
#"2015-02-02",
#"2015-01-27",
#"2015-01-19",
#"2015-01-12"];
NSMutableArray *arrDates = [[NSMutableArray alloc]init];
NSDateFormatter *df = [[NSDateFormatter alloc]init];
[df setDateFormat:#"yyyy-MM-dd"];
[df setTimeZone:[NSTimeZone systemTimeZone]];
for (int i = 0; i<arrr.count; i++) {
[arrDates addObject:[df dateFromString:arrr[i]];;
}
NSLog(#"%#",arrDates);
now sort array for dates because your array contains NSDate Objects. you don't have key so do not pass any key
NSSortDescriptor *dateDescriptor = [NSSortDescriptor
sortDescriptorWithKey:#""
ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:dateDescriptor];
NSArray *sortedDateArray = [arrDates sortedArrayUsingDescriptors:sortDescriptors];
NSLog(#"%#",sortedDateArray);

Answer 3

I can understand as you are a newbie,Follow these steps but remember to get the understanding first:-
1.Enumerate your array to get all the strings(dates for your understanding),and add those to another array you want, like this:-
for (NSString *dateString in yourArrayofDates) {
NSDate *date=[self getDateFromDateString:dateString];
[yourAnotherDateArray addObject:date];
}
2.Add a method to get the NSDate from your string,like this:-
-(NSDate *)getDateFromDateString :(NSString *)dateString {
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"yyyy-MM-dd"];
NSDate *date = [dateFormatter dateFromString:dateString];
return date;
}