client server json response - ios

Question

I need to display particular object for key(currency) using post method after getting response from web.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController{
NSMutableData *mutableData;
NSMutableString *arr;
#define URL #"website"
// change this URL
#define NO_CONNECTION #"No Connection"
#define NO_VALUES #"Please enter parameter values"
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(IBAction)sendDataUsingPost:(id)sender{
[self sendDataToServer :#"POST"];
}
-(IBAction)sendDataUsingGet:(id)sender{
[self sendDataToServer : #"GET"];
}
-(void) sendDataToServer : (NSString *) method{
NSString *Branchid=#"3";
serverResponse.text = #"Getting response from server...";
NSURL *url = nil;
NSMutableURLRequest *request = nil;
if([method isEqualToString:#"GET"]){
NSString *getURL = [NSString stringWithFormat:#"%#?branch_id=%#", URL, Branchid];
url = [NSURL URLWithString: getURL];
request = [NSMutableURLRequest requestWithURL:url];
NSLog(#"%#",getURL);
}else{ // POST
NSString *parameter = [NSString stringWithFormat:#"branch_id=%#",Branchid];
NSData *parameterData = [parameter dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
url = [NSURL URLWithString: URL];
NSLog(#"%#", parameterData);
request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPBody:parameterData];
arr= [NSMutableString stringWithUTF8String:[parameterData bytes]];
NSLog(#"responseData: %#", arr);
//NSLog(#"%#",[[arr valueForKey:#"BranchByList"]objectForKey:#"currency"]);
}
[request setHTTPMethod:method];
[request addValue: #"application/x-www-form-urlencoded; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
//NSLog(#"%#",[connection valueForKeyPath:#"BranchByList.currency"]);
if( connection )
{
mutableData = [NSMutableData new];
//NSLog(#"%#",[connection valueForKeyPath:#"BranchByList.currency"]);
}
}
-(void) connection:(NSURLConnection *) connection didReceiveResponse:(NSURLResponse *)response
{
[mutableData setLength:0];
}
-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[mutableData appendData:data];
}
-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
serverResponse.text = NO_CONNECTION;
return;
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSMutableString *responseStringWithEncoded = [[NSMutableString alloc] initWithData: mutableData encoding:NSUTF8StringEncoding];
//NSLog(#"Response from Server : %#", responseStringWithEncoded);
NSLog(#"%#",responseStringWithEncoded );
NSLog(#"%#",[responseStringWithEncoded valueForKeyPath:#"BranchByList.currency"] );
NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[responseStringWithEncoded dataUsingEncoding:NSUnicodeStringEncoding] options:#{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
serverResponse.attributedText = attrStr;
// NSLog(#"%#",attrStr);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
i got response branch_id=3 but i want to show to "currency" but i tried lot but failure.
my response like this I need to display only currency.....
Response from Server :
{"BranchByList":
[
{"id":"342","flag_image":"http:\/\/demo.techzarinfo.com\/newant‌​ara\/images\/flags\/USD.png","units":"1","code":"USD B","currency":"US DOLLAR BIG","buy":"4.36","sell":"4.395","updated":"2016-04-11 03:24:24"
},
{"id":"342","flag_image":"http:\/\/demo.techzarinfo.com\/newantara\/i‌​mages\/flags\/USD.png","units":"1","code":"USD B","currency":"US DOLLAR BIG","buy":"4.36","sell":"4.395","updated":"2016-04-11 03:24:24"
}
]};

Answer 1

Your response structure is:
-Dictionary
--Array
---Dictionary Objects
You need to convert your Data into NSDictionary to parse it.
Following code will do that for you:
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData: mutableData
options:kNilOptions
error:&error]; //Now we got top level dictionary
NSArray* responseArray = [json objectForKey:#"BranchByList"]; //Now we got mid level response array
//Get Embeded objects from response Array:
NSDictionary *priceDic = [responseArray objectAtIndex:0]; //Getting first object since you arent telling what the second object is for
NSString *buyingPrice = [priceDic objectForKey: #"buy"]; //Buying price
NSString *sellingPrice = [priceDic objectForKey:#"sell"]; //Selling price
NSString *currency = [priceDic objectForKey:#"currency"]; //Currency
Though this is only sticking to the point and getting the job done.
Proper way to get the job done would be to create a model class for response. Create a class inherited from NSObject and use it as model for this response. Add a initWithDic: method to that class, Pass it your response dic as parameter and delegate all this dictionary parsing to that method.
Also, NSURLConnection is deprecated since iOS 9.0. You should use NSURLSession instead.

Answer 2

Try This May be it will help you:-
NSString *str=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"str : %#",str);
NSDictionary *dict6 = [self cleanJsonToObject:responseData];
NSLog(#"str : %#",dict6);
NSMArray *array1 = [dict6 objectForKey:#"BranchByList"];
NSLog(#"DICT : %#",array1);
NSDictionary *Dict3 = [array1 objectAtIndex:0];
NSString *Str1 = [dict3 objectForKey:#"currency"];
NSLog(#"Str1 : %#",Str1);
- (id)cleanJsonToObject:(id)data
{
NSError* error;
if (data == (id)[NSNull null])
{
return [[NSObject alloc] init];
}
id jsonObject;
if ([data isKindOfClass:[NSData class]])
{
jsonObject = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
} else
{
jsonObject = data;
}
if ([jsonObject isKindOfClass:[NSArray class]])
{
NSMutableArray *array = [jsonObject mutableCopy];
for (int i = (int)array.count-1; i >= 0; i--)
{
id a = array[i];
if (a == (id)[NSNull null])
{
[array removeObjectAtIndex:i];
} else
{
array[i] = [self cleanJsonToObject:a];
}
}
return array;
} else if ([jsonObject isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *dictionary = [jsonObject mutableCopy];
for(NSString *key in [dictionary allKeys])
{
id d = dictionary[key];
if (d == (id)[NSNull null])
{
dictionary[key] = #"";
} else
{
dictionary[key] = [self cleanJsonToObject:d];
}
}
return dictionary;
} else
{
return jsonObject;
}
}