Check if text file in directory to show direct - ios

Question

I am developing an iOS app. I download the text file from a URL and save it into a directory, but I can't find the file in the directory, so the code downloads it again. How do I check for the file?
if ([[NSFileManager defaultManager] fileExistsAtPath:localfile]) {
content = [NSString stringWithContentsOfFile:localfile
encoding:NSUTF8StringEncoding
error:NULL];
}else
{
NSURL* url = [NSURL URLWithString:#"http://webapp.opaxweb.net/books/gurugranthsahib.txt"];
NSArray* pathArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString* documentsDir = [pathArray objectAtIndex:0];
localfile =[documentsDir stringByAppendingPathComponent:#"data"];
NSData* data = [NSData dataWithContentsOfURL:url];
[data writeToFile:localfile atomically:YES];
content = [NSString stringWithContentsOfFile:localfile
encoding:NSUTF8StringEncoding
error:NULL];
}
_textfield.text=content;

Answer 1

Your text data is quite big and hence you should use nsurl connection! Your code is totally correct but this is a better approach.
- (void)viewDidLoad
{
[super viewDidLoad];
self.fileName = #"Data";
self.fileData = [NSMutableData data];
[self checkFileExitsorNOt];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self.fileData setLength:0];
self.totalFileSize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[self.fileData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSArray *dirArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSLog(#"%#", [dirArray objectAtIndex:0]);
NSString *path = [NSString stringWithFormat:#"%#/%#", [dirArray objectAtIndex:0],self.fileName];
if ([self.fileData writeToFile:path options:NSAtomicWrite error:nil] == NO) {
NSLog(#"writeToFile error");
}
else {
NSLog(#"Written!");
}
}
-(void) checkFileExitsorNOt
{
NSArray *dirArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSLog(#"%#", [dirArray objectAtIndex:0]);
NSString *path = [NSString stringWithFormat:#"%#/%#", [dirArray objectAtIndex:0],self.fileName];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
NSString *cont = [NSString stringWithContentsOfFile:localfile
encoding:NSUTF8StringEncoding
error:NULL];
NSLog(#"Content from file : %#",cont);
}
else
{
NSString *file = [NSString stringWithFormat:#"http://webapp.opaxweb.net/books/gurugranthsahib.txt"];
NSURL *fileURL = [NSURL URLWithString:file];
NSURLRequest *req = [NSURLRequest requestWithURL:fileURL];
NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];
}
}