Write JSON Response to .plist File
I bet that your JSON contains at least one null value.
When you have JSON that contains null and you convert it using NSJSONSerialization, the null is replaced by an instance of NSNull. If your dictionary contains NSNull, then writeToURL:atomically: will fail.
This is because the convenience methods for reading and writing dictionaries (and arrays) only work if the data in the collection is restricted to property list types. These are:
NSStringNSNumberNSDataNSDateNSArrayNSDictionary. And for dictionaries, the keys must beNSStrings.
You can also use mutable subclasses (like NSMutableString) when writing.
If you have anything not on that list, you can't use writeToURL:atomically or any of the similar convenience methods.
The problem is that some valid JSON can't be converted to property lists. Also, some valid property lists can't be converted to JSON (because NSDate won't automatically convert to valid JSON).
If it was me, I'd just write the data to a JSON file. Leave it in its original format. You can convert to/from JSON easily, so leave it that way.
If your dictionary contains NSNull, then writeToURL:atomically: will fail.
For dictionaries, the keys must be NSStrings.
The problem is that some valid JSON can't be converted to property lists. Also, some valid property lists can't be converted to JSON.
Don't Forget, If you must use a property list, you will need to scan the entire dictionary and convert the nulls into something that can be saved in a property list file.
Only Solution is that you have to check all the NULL Values and Replace it with @" ".
Happy Coding...
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);NSString *libraryPath = [paths objectAtIndex:0];NSString *filename = @"FinalResult.plist";NSString *pathFilename = [libraryPath stringByAppendingPathComponent:filename];NSDictionary *dictResult = [json objectForKey:@"myKey"];[dictResult writeToFile:pathFilename atomically:YES];