iPhone with WebService

Here, we can find how to connect a web-service in iPhone application to view list.

I assume that a web service is already created in Asp.net or Jsp or PhP which return data in json format. Now, we have three things to do, to connect the web service. 1> Connect web service; 2> Access data from it and 3> Show it in a list.

First click on xCode icon. It will open the xCode tool.

Now, select option to create new project. Choose view base application from the list. 

Give a name for the project and we are ready to go now.

There will be few files in project. Some of them are not require any changes. Delete -  ViewController.h and ViewController.m  and then add file from File->New File .

Then Select UIViewController type and do next.

Select UITableViewController and give name iWebServiceViewController and save.  The files with which we will work are-  iWebServiceViewController.h and iWebServiceViewController.m  from Classes folder .  ‘.H’ -file contains a kind of signature of ‘.M’ file.  Another one is - iWebServiceViewController.xib in Resources folder under project. It will be used for design the application window.

1>Connect web service[ using Object-C]

In  iWebServiceViewController.h ->

#import <UIKit/UIKit.h>

#define wsURL @"http://yourwebserviceurl"

@interface listEmpViewController : UITableViewController {

NSMutableArray *jsonResult;

}

@end

In  iWebServiceViewController.m ->

//======User Defined==============

-(void)connectService{

NSURL *url=[NSURL URLWithString:wsURL];

NSData *data=[NSData dataWithContentsOfURL:url];

[self getData:data];

}

//=======================

In viewDidLoad method->

- (void)viewDidLoad {

            [super viewDidLoad];

[self connectService];

}

2> Access data from it->

-(void)getData:(NSData *) data{

            NSError *error;

            jsonResult = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

}

3> Show it in a list ->

In  iWebServiceViewController.m ->

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    // Return the number of rows in the section.

    return [jsonResult 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];

    }

    

    

NSDictionary *info= [json objectAtIndex:indexPath.row];

cell.textLabel.text=[info objectForKey:@"forename"];

    return cell;

}

At last-

In AppDelegate.m changes need to be done in import->

#import “iWebServiceViewController.h”

And also in didFinishLaunchingWithOptions->

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    // Override point for customization after application launch.

iWebServiceViewController *listEmp=[[ iWebServiceViewController alloc] init];

listEmp.title=@"Emp table";

self.window.rootViewController= listEmp;

// Set the view controller as the window's root view controller and display.

            //self.window.rootViewController = self.viewController;

            [self.window makeKeyAndVisible];

    

            return YES;

}

That’s it, Enjoy… J