How to Save Data Using File Path in iPhone

Introduction

In this I will create a single view application. Here I use a text field from outlet to take input from the keyboard and one button "save", to save data statically on a particular path.

For new entry we edit on @"datafile.dat".

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 and Company Identifier then click on Next.

Step 5

Select the location where you want to save your project and click on Create.

Step 6

Here we write code.

AppDelegate.h

#import <UIKit/UIKit.h>
@class file_exampleViewController;
@interface file_exampleAppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) file_exampleViewController *viewController;
@end

AppDelegate.m

#import "file_exampleViewController.h"
@implementation file_exampleAppDelegate
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
self.viewController = [[[file_exampleViewController alloc] initWithNibName:@"file_exampleViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
@end

ViewController.h

#import <UIKit/UIKit.h>
@interface file_exampleViewController : UIViewController
@property (strong, nonatomic) IBOutlet UITextField *textBox;
- (IBAction)saveText:(id)sender;
@end

ViewController.m

#import "file_exampleViewController.h"

@interface file_exampleViewController ()

@end

@implementation file_exampleViewController

@synthesize textBox;

- (void)saveText:(id)sender

{
NSFileManager *filemgr;
NSData *databuffer;
NSString *dataFile;
NSString *docsDir;
NSArray *dirPaths;
filemgr = [NSFileManager defaultManager];
dirPaths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
dataFile = [docsDir
stringByAppendingPathComponent: @"datafile.dat"];
databuffer = [textBox.text
dataUsingEncoding: NSASCIIStringEncoding];
[filemgr createFileAtPath: dataFile
contents: databuffer attributes:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSFileManager *filemgr;
NSString *dataFile;
NSString *docsDir;
NSArray *dirPaths;
filemgr = [NSFileManager defaultManager];
// Identify the documents directory
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
// Build the path to the data file
dataFile = [docsDir stringByAppendingPathComponent:
@"datafile.dat"];
// Check if the file already exists
if ([filemgr fileExistsAtPath: dataFile])
{
// Read file contents and display in textBox
NSData *databuffer;
databuffer = [filemgr contentsAtPath: dataFile];
NSString *datastring = [[NSString alloc]
initWithData: databuffer
encoding:NSASCIIStringEncoding];
textBox.text = datastring;
}}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.textBox = nil;
}
@end