Conversion between Nsjsonserialization-json data and Nsdictionary and Nsarray

In iOS 5, Apple introduced a nsjsonserialization class that parses the JSON string .

With this class, we can complete the JSON data with The transformation between Nsdictionary and Nsarray. Previously, I remembered that I was using a third-party plugin. However, Apple out of this set of analysis, efficiency also greatly exceeded, all the analytic third-party class library. Therefore, it is recommended to useNsjsonserialization class to complete the conversion. First, convert nsdictionary or Nsarray to JSON string

Convert a dictionary or array into a JSON string

-(NSData *) Tojsondata: (ID) thedata{

nserror *error = nil;

NSData *jsondata = [nsjsonserialization datawithjsonobject:thedata

options:nsjsonwritingprettyprinted

error:&error];

if ([jsondata length] > 0 && error = = nil) {

return jsondata;

}else{

return nil;

}

}

Using the return of this method, we can get the JSON string we want.

NSString *jsonstring = [[nsstring alloc] initwithdata:jsondata

encoding:nsutf8stringencoding];

Second, the JSON string translates to nsdictionary or nsarray WillNSString converted to nsdata

[Jsonstring datausingencoding: nsasciistringencoding];

Converts a JSON string into a dictionary or array

-(ID) toarrayornsdictionary: (nsdata *) jsondata{

nserror *error = nil;

id jsonobject = [nsjsonserialization jsonobjectwithdata:jsondata

options:nsjsonreadingallowfragments

error:&error];

if (jsonobject! = Nil && error = = nil) {

Returnjsonobject;

}else{

// Parse error

return nil;

}

}

third, the JSON string and the Nsarray and nsdictionary operation for encapsulationOf course, there are many times when we define these operations, respectively, inin a taxonomy of NSObject and NSStringDirect stickers: 1. Convert nsstring to Nsarray or nsdictionary

#import "Nsstring+jsoncategories.h"

@implementationNSString (jsoncategories)

-(ID) jsonvalue;

{

nsdata* Data =[selfdatausingencoding: nsutf8stringencoding];

__autoreleasing nserror* error= nil;

IDresult = [nsjsonserializationjsonobjectwithdata:d ataoptions: Kniloptionserror:& ERROR];

if (Error! = nil) return nil;

return result;

}

@end

2. Place Nsarray or nsdictionary translates to NSString

#import "Nsobject+jsoncategories.h"

@implementation NSObject (jsoncategories)

-(nsdata*) jsonstring;

{

nserror* error = nil;

IDresult = [nsjsonserializationdatawithjsonobject: Self

options:kniloptions error:&error];

if (Error! = nil) return nil;

return result;

}

@end

Conversion between Nsjsonserialization-json data and Nsdictionary and Nsarray