NSURL string content to a label - ios

Question

Im trying to read some values from a local url when i press a button and i send the value to a label. as soon as i launch the app and i press the button for the first time i get the value. but the second time i press the button the label get no text even though the NSLog message continues to display the value. any idea?
here is the code:
- (IBAction)refresh:(id)sender {
NSArray *listItems;
NSString *msg;
NSStringEncoding encoding;
NSURL *url = [NSURL URLWithString:#"http://192.168.1.177"];
NSData *data = [NSData dataWithContentsOfURL:url];
msg = [[NSString alloc] initWithData:data encoding:encoding];
listItems = [msg componentsSeparatedByString:#" "];
label.text = listItems[0];
NSLog(listItems[0]);
}

Answer 1

Your encoding variable is never initialized with a value, so it has the default value of 0, which is not a valid value of NSStringEncoding according to NSString.h. If you run the static analyzer (Command-Shift-B in Xcode), you will get a message that has an uninitialized value when it is used.
Change this line:
msg = [[NSString alloc] initWithData:data encoding:encoding];
to this:
msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
(Substitute the appropriate encoding, but NSUTF8StringEncoding is a good first guess.)
You should also use a format string to log:
NSLog(#"%#", listItems[0]);