Secure Coding iPhone and iPad Apps

A Simple App Using NSURLConnection

The easiest way to initiate HTTP requests in iOS is to utilize the NSURLConnection class. Here is sample code from a very simple application that takes in a URL from an edit-box, makes a GET request, and displays the HTML obtained.
Please note that the code in this particular example is mostly from Apple's wonderful tutorial on how to use NSURLConnection

//This IBAction fires when the user types in a URL and presses GO

- (IBAction) urlBarReturn:(id)sender

{

//htmlOutput is the UITextView that displays the HTML

htmlOutput.text=@"";

//urlBar is the UITextField that contains the URL to load

NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:urlBar.text]

cachePolicy:NSURLRequestUseProtocolCachePolicy

timeoutInterval:60.0];

NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

if(!theConnection)

htmlOutput.text=@"failed";

}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

{

//receivedData is of type NSMutableData

[receivedData setLength:0];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

[receivedData appendData:data];

NSString *tempString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

htmlOutput.text = [NSString stringWithFormat:@"%@%@",htmlOutput.text,tempString];

[tempString release];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

[connection release];

[receivedData release];

NSLog(@"Connection failed! Error: %@ %@",

[error localizedDescription],

[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);

htmlOutput.text=[NSString stringWithFormat:@"Connection failed! Error %@ %@",[error localizedDescription],

[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);

[connection release];

[receivedData release];

}