How to create read/write .txt file in xcode4? [closed] - ios

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i am newbie of iOS development , i'm facing a problem from last 2 days
I want to create , read and write .txt file in xcode4 ... please help me as a complete code.
your answer accepted warmly.
Thanks.

Answer 1

For each iOS app you can only write file inside app's document directory.
Here is a sample code to do that.
//ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
#public
NSString *filePath;
NSString *fileData;
IBOutlet UITextView *textView;
}
#property (nonatomic, retain) NSString *filePath;
#property (nonatomic, retain) NSString *fileData;
#end
//ViewController.m
#import "ViewController.h"
#implementation ViewController
#synthesize filePath;
#synthesize fileData;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [[NSString alloc] initWithFormat:#"%#", [paths objectAtIndex:0]];
//define a file path
filePath = [[NSString alloc] initWithFormat:#"%#", [documentsDirectory stringByAppendingPathComponent:#"YourFile.txt"]];
//check if file is exists or not then write some data
NSFileManager *fileManager = [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:filePath])
{
fileData = #"My name is maverick";
[fileData writeToFile:filePath atomically:YES encoding:NSUnicodeStringEncoding error:nil];
textView.text = fileData;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)readFile:(id)sender
{
fileData = [[NSString alloc] initWithContentsOfFile:filePath usedEncoding:nil error:nil];
textView.text = fileData;
}
-(IBAction)writeFile:(id)sender
{
fileData = textView.text;
[fileData writeToFile:filePath atomically:YES encoding:NSUnicodeStringEncoding error:nil];
}
#end