CODEWITHSUNDEEP
swiftnspredicate
remy boys
remy boys

Reputation: 2948

filter NSArray using (NSDate Predicate) until the whole Array is filtered

i'm having difficulty for defining my question in title so if my title is not appropriate then please do correct me ok so thing is that i have an NSArray named results which is fetched from CoreData and in this array the items have date key which is of NSDate type . i want to predicate the NSArray according to the months on Date key , and am able to do that manually this is how am doing this : 

 let predicated = NSPredicate(format: "date >= %@ AND date <= %@", start, End)
 var filtered =  results.filteredArrayUsingPredicate(predicated)

here start and end are NSdate which are first and last date of a given month say am predicating something like "give me the results which are between 1 jan to 31 jan" and its working fine

but i want to predicate my whole result array in a way so that i don't have to provide the date range , like a function which will take the NSArray and give me the output with variables of months like 

func  filterResultArray(NSArray) -> name of months with results {

// here predicate the whole array and add them to the founded months variable 

}


print( "\(filterResultArray(resultsArray) )") // should print  :
jan = 5 , feb = 18 , march = 5 , may = 87

please tell me what am trying to do using this type of approach is even possible or not and if yes the please give me a little hint or direction about how am gonna do that it'll be so helpful for me

for better understanding please see the example:

example - myArray = [ "1,01,2016", "4,01,2016" ,"28,01,2016", "6,02,2016" "25,02,2016", "29,02,2016"  "4,03,2016", "4,04,2016"  "10,04,2016", "24,04,2016"  "9,05,2016", "29,05,2016"  "17,05,2016", "24,05,2016"  "12,06,2016", "13,06,2016"   ]

now how can i filter this array so that i can get a results something like : 

January = 3
feb = 3
march = 1
april = 3
may = 4 
june = 2

Upvotes: 0

Views: 372

Answers (1)

Russell
Russell

Reputation: 5554

The solution that @Joshua has shown you looks very elegant - assuming you are only interested in the month - meaning March 2016 counts as the same thing as March 2015 - then when you're parsing your data into myArray, just create an array of myMonths and strip out the middle data element to give you the month.

It's going to look something like this - 

let dateComponents = resultDate.componentsSeparatedByString(",")
myMonths.append(dateComponents[1])

if you do need to include the year in the count, then just append the strings so that you get "201603" or "032016"

Upvotes: 1

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