Use json in IOS and json in IOS

Use json in IOS and json in IOS

1. Download jsonframework :json-framework from https://github.com/stig/json-framework /.

2. decompress the downloaded package and import all files in the class folder to the current project.

3. Add the import Statement to the file used: # import "SBJson. h"

4. Convert the json string into an NSDictionary object.

Cpp Code

NSString * temp = @ "{\" China \":{

\ "Beijing \": {\ "Beijing 1 \": 1, \ "Beijing 2 \": 2, \ "Beijing 3 \": 3 },

\ "Shanghai \": {\ "Shanghai 1 \": 4, \ "Shanghai 2 \": 5, \ "Shanghai 3 \": 6 },

\ "Guangzhou \": {\ "Guangzhou 1 \": 7, \ "Guangzhou 2 \": 8, \ "Guangzhou 3 \": 9 }}}";

NSDictionary * items = [temp JSONValue];

NSString * temp = @ "{\" China \ ": {\" Beijing \ ": {\" Beijing 1 \ ": 1, \" Beijing 2 \ ": 2, \ "Beijing 3 \": 3 },\ "Shanghai \": {\ "Shanghai 1 \": 4, \ "Shanghai 2 \": 5, \ "Shanghai 3 \": 6 },\ "Guangzhou \": {\ "Guangzhou 1 \": 7, \ "Guangzhou 2 \": 8, \ "Guangzhou 3 \": 9 }}"; NSDictionary * items = [temp JSONValue];

5. recursively traverse the parsed NSDictionary object

 

Cpp Code

-(Void) visitDict :( NSDictionary *) dict {

NSArray * keys = [dict allKeys];

For (NSString * key in keys ){

NSString * result = [NSString stringWithFormat: @ "key = % @, value = % @", key, [dict objectForKey: key];

NSLog (result );

If ([[dict objectForKey: key] isKindOfClass: [NSDictionary class]) {

[Self visitDict: [dict objectForKey: key];

}

}

}

-(void)visitDict:(NSDictionary *)dict{  NSArray *keys=[dict allKeys];  for (NSString *key in keys) {     NSString *result=[NSString stringWithFormat:@"key=%@,value=%@",key,[dict objectForKey:key]];     NSLog(result);     if([[dict objectForKey:key] isKindOfClass:[NSDictionary class]]){            [self visitDict:[dict objectForKey:key]];     }   }}

6. Restore the parsed NSDictionary object to a json string

Cpp Code

NSString * jsonStr = [items JSONRepresentation];

NSString * jsonStr=[items JSONRepresentation];

 

IOS development, how to use json files

JSON is generally a piece of data requested from the network interface. first, you need to send a request to the server, get a piece of JSON, and then parse it. two third-party open source class libraries, ASIHTTPRequest and SBJSON, are used.

NSURL * url = [NSURL URLWithString: [urlString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

SendRequest = [ASIHTTPRequest requestWithURL: url];

[SendRequest setTimeOutSeconds: 30];

[SendRequest setDelegate: self];

[SendRequest startAsynchronous];

-(Void) requestFinished :( ASIHTTPRequest *) request

{

NSString * responseString = [request responseString];

If (responseString = nil | [responseString JSONValue] = nil ){

Return;

}

NSDictionary * responseDict = [responseString JSONValue];

Int result = [[responseDict objectForKey: @ "status"] intValue];

If (result = 1 ){

NSArray * location = [responseDict objectForKey: @ "locations"];

...............................

}

How to get a json package in the ios path

NSString * strPath = [[NSBundle mainBundle] pathForResource: @ "json file name" ofType: @ "json"]; NSString * str = [NSString stringWithContentsOfFile: strPath encoding: NSUTF8StringEncoding error: nil];