Error reading csv file on iOS device - ios

Question

I created an app to save as an csv file, app works fine in iOS simulator with both write and read. When i load the app to iOS device it doesn't data.
- (IBAction)saveInfo:(id)sender {
NSString *resultLine = [NSString stringWithFormat:#"%#,%#,%#\n",
self.food.text,
self.movies.text,
self.channel.text];
NSArray *path= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [path objectAtIndex:0];
//resultView.text = docPath;
NSString *filename = [docPath stringByAppendingString:#"result.csv"];
resultView.text = filename;
if (![[NSFileManager defaultManager] fileExistsAtPath:filename])
{
[[NSFileManager defaultManager] createFileAtPath:filename contents:nil attributes:nil];
}
NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:filename];
[fileHandle seekToEndOfFile];
[fileHandle writeData:[resultLine dataUsingEncoding:NSUTF8StringEncoding]];
[fileHandle closeFile];
self.food.text = nil;
self.movies.text = nil;
self.channel.text =nil;
NSLog(#"Info saved");
}
- (IBAction)viewInfo:(id)sender {
NSArray *path= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [path objectAtIndex:0];
NSString *filename = [docPath stringByAppendingString:#"result.csv"];
NSString *fileContent=[NSString stringWithContentsOfFile:filename encoding:NSUTF8StringEncoding error:nil];
resultView.text = fileContent;
}

Answer 1

You are building the path incorrectly. Use:
NSArray *path= NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [path objectAtIndex:0];
NSString *filename = [docPath stringByAppendinPathComponent:#"result.csv"];
The code you have results in a path like <path to app bundle>/Documentsresult.csv and on the device you can't write to the app bundle.

Answer 2

On Button action u can write below code maybe File will be displayed in my point of view its running correctly you should tray.....
NSFileManager *filemgr;
NSString *dataFile;
NSString *docsDir;
NSArray *dirPaths;
filemgr = [NSFileManager defaultManager];
dirPaths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
dataFile = [docsDir
stringByAppendingPathComponent: #"datafile.csv"];
NSLog(#"%#",dataFile);
NSData *data = [filemgr contentsAtPath:dataFile];
NSString *fooString=#"----------------\n Full File Data \n ---------------- \n " ;
fooString = [fooString stringByAppendingString:[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] ];
self.FileTextView.text=fooString;