[ACCEPTED]-How to convert NSArray to NSData?-iphone
Use NSKeyedArchiver (which is the last sentence 12 of the post Garrett links):
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array];
Note that all 11 the objects in array must conform to the NSCoding protocol. If 10 these are custom objects, then that means 9 you need to read up on Encoding and Decoding Objects.
Note that this will 8 create a fairly hard-to-read property list 7 format, but can handle a very wide range 6 of objects. If you have a very simple array 5 (strings for instance), you may want to 4 use NSPropertyListSerialization, which creates 3 a bit simpler property list:
NSString *error;
NSData *data = [NSPropertyListSerialization dataFromPropertyList:array format:NSPropertyListBinaryFormat_v1_0 errorDescription:&error];
There's also 2 an XML format constant you can pass if you'd 1 rather it be readable on the wire.
On a somewhat related note, here's how you 1 would convert the NSData back to an NSArray:
NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithData:data]
I used this code.
NSError *error;
NSMutableData *jsonData = [[NSJSONSerialization dataWithJSONObject:yourDemoArray
options:0 // Pass 0 if you don't care about the readability of the generated string
error:&error] copy];
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Swift :
let data = NSKeyedArchiver.archivedData(withRootObject: jsonArray)
print(data)
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You can do this-
NSArray *array= [NSArray array];
NSData *dataArray = [NSKeyedArchiver archivedDataWithRootObject:array];
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In iOS 9+ use this please:
NSArray *array = [[NSArray alloc] init];
NSData *data = [NSPropertyListSerialization dataWithPropertyList:array format:NSPropertyListBinaryFormat_v1_0 options:0 error:nil];
The older version 1 of this was deprecated in iOS 8.
Swift 5
let data = try! NSKeyedArchiver.archivedData(withRootObject: array, requiringSecureCoding: true)
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