Changing link in uiwebview

Hi .. Let your url / address is http://www.example.com/ , and ur file name is link.txt. when ur application load u can change the file name in any string then append the string .. then load the url to ur web view.

Code Bellow,

NSString *fileName = @"demo.txt";
NSString *address = @"https://www.example.com/";
address = [address stringByAppendingString:fileName];
NSLog(@"%@",address); // check ur url link in the debug terminal, it should be like .
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[self.webView loadRequest:request];

address should be like :- http://www.example.com/link.txt[]

Okay ,
then if u want to download the file on button click do this, download and the file to ur device
write this method on button action,

NSData *urlData = [NSData dataWithContentsOfURL:url];
NSString  *filePath;
NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString  *documentsDirectory = [paths objectAtIndex:0];
filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"filename.txt"];
NSLog(@"%@",filePath);
[urlData writeToFile:filePath atomically:YES];

If u want you web view to do this automatically, just give some delay after web view loaded and the above method.