Introduction
JSON stands for JavaScript Object Notation. It is a lightweight data-interchange format. It is easy for humans to read and write. JSON is a data format that is completely language independent. It is a collection of name/value pairs and an ordered list of values.
In this article I will create a Single view application and I will use a table view from outlet to connect it's delegate or datasource to the file owner. Here I use an API loan service and fetch a "name" entity and show it in the table.
To understand it we use the following.
Step 1
Open XCode by double-clicking on it.
Step 2
Create a New XCode Project by clicking on it.
Step 3
Now Select Single View Application and click on Next.
Step 4
Now provide your Product Name.
Step 5
Select the location where you want to save your project and click on Create.
Step 6
Now we write the code.
ViewController.h
//
// CirclesViewController.h
// jsonTest
//
// Created by Sachin Bhardwaj on 12/12/12.
// Copyright (c) 2012 Sachin Bhardwaj. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface CirclesViewController : UIViewController{
NSMutableArray *m_userprofiledatarray;
NSURL *_feedurl;
NSMutableData *responseData;
NSHTTPURLResponse* httpResponse ;
NSString *responseString;
int responseCode;
NSMutableArray * name;
NSMutableArray * activity;
IBOutlet UITableView *table;
}
@property(strong,nonatomic)IBOutlet UITableView *table;
@property (nonatomic, assign) BOOL islistDisplay;
@property(nonatomic,copy) NSMutableArray * name;
@property(nonatomic,copy) NSMutableArray * activity;
@end
ViewController.m
//
// CirclesViewController.m
// jsonTest
//
// Created by Sachin Bhardwaj on 12/12/12.
// Copyright (c) 2012 Sachin Bhardwaj. All rights reserved.
//
#import "CirclesViewController.h"
@interface CirclesViewController ()
@end
@implementation CirclesViewController
@synthesize name,activity;
@synthesize table;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// CircleGroupName = [[NSMutableArray alloc]init];
//
// [self getdata];
}
-(void)viewWillAppear:(BOOL)animated{
name = [[NSMutableArray alloc]init];
[super viewWillAppear:animated];
[self getdata];
}
-(void)getdata{
NSString *urlstring = [NSString stringWithFormat:@"http://api.kivaws.org/v1/loans/search.json?status=fundraising"];
_feedurl = [NSURL URLWithString:urlstring];
NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:_feedurl];
//do post request for parameter passing
[theRequest setHTTPMethod:@"GET"];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if( theConnection )
{
[theConnection release];
}
else
{
[theConnection release];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
responseData = [[NSMutableData alloc] init];
httpResponse = (NSHTTPURLResponse*)response;
responseCode = [httpResponse statusCode];
responseString = [NSHTTPURLResponse localizedStringForStatusCode:[(NSHTTPURLResponse *)response statusCode]];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data11{
[responseData appendData:data11];
NSString* myString;
myString = [[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding];
[myString release];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if(responseCode == 200){
NSString *_responsedatastring = [[[NSString alloc] initWithData:responseData encoding: NSASCIIStringEncoding]autorelease];
NSData* logindata = [_responsedatastring dataUsingEncoding:NSUTF8StringEncoding];
NSArray *profileFeeds_array = [NSJSONSerialization JSONObjectWithData:logindata options: NSJSONReadingMutableLeaves error:nil];
self.name = [profileFeeds_array valueForKey:@"loans"];
self.activity = [name valueForKey:@"name"];
NSLog(@"activity:%@",activity);
[table reloadData];
}else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Please try again.Network Problem"
message:nil
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
alert.tag = 2;
[alert show];
[alert release];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
// [pullTableView reloadData];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [name count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell==nil)
{
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [activity objectAtIndex:indexPath.row];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
}
@end
Step 7
Now we check the output in a console window.
![Consol-window-output.png]()
It is a running API so sometimes the output will be different. But here my main purpose is to explain how to use a JSON service in iPhone.
Step 8
Finally we click on the Run button to show the output.
Output 1 in iPhone:
![Output1-in-iPhone.png]()
Before scrolling down to show output in the table.
Output 2 in iPhone:
![Output2-in-iPhone.png]()
After scrolling down to show output in the table.
Summary
API Reference-http://build.kiva.org/api
http://api.kivaws.org/v1/loans/search.json?status=fundraising