objective C: write in a csv (txt) string contained in some textfield

Question

In my project I have a view where I write words in some textfield, when I press a button these string must be stored in a csv file as this example: (example with 5 textfield)

firststring#secondstring#thirdstring#fourthstring#fifthstring;

this is an example of the result that I want. How can I do?

_{Edited to add:}

code for the string

 NSMutableString *csvString = [NSMutableString stringWithString:textfield1.text];
[csvString appendString:@"#"];
[csvString appendString:textfield2.text];
[csvString appendString:@"#"];
[csvString appendString:dtextfield3.text];
[csvString appendString:@"#"];
[csvString appendString:textfield4.text];
[csvString appendString:@"#"];
[csvString appendString:textfield5.text];
[csvString appendString:@"#"];
[csvString appendString:textfield6.text];
[csvString appendString:@"#"];
[csvString appendString:textfield7.text];
[csvString appendString:@"#"];
if (uiswitch.on) { //switch
    [csvString appendString:@"1"];
}
else [csvString appendString:@"0"];
[csvString appendString:@";"];

finally csvString

NSLog(@"string = %@", csvString);

is exactly my string

Answer 1

Aside from any CSV format issues, it also looks like you're trying to write to the main bundle which is not allowed.
It may work in the simulator but not on the device.
See the Security and The File System sections in the iOS Application Programming Guide.

You'll need to create the file in the tmp or Documents folder instead. For example:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];
NSString *filename = [docDir stringByAppendingPathComponent:@"Client.txt"]; 
NSError *error = NULL;
BOOL written = [csvString writeToFile:filename atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (!written)
    NSLog(@"write failed, error=%@", error);