How to update a NSString?

Question

Hi, everyone,

I want to ask a objective C question. I have a string retrieve from UITextField and I want to check the string contains the '@' or not. However, when I use the following code, it has some errors, can anyone help me? Thank you.

if([inputTextField.text rangeOfString:@"%"].location != NSNotFound)
    NSLog(@"It does not contain the %@");
else
    NSLog(@"It contains the %@");

Answer 1

In you NSLog statement you put a %@ but no arguments after.

Answer 2

Check the syntax:

if([inputTextField.text rangeOfString:myString].location == NSNotFound)
    NSLog(@"It does not contain the %@", myString);
else
    NSLog(@"It contains the %@", myString);

As you will see, the %@ will be replaced with the content of myString.

Answer 3

You can use

NSLog([NSString stringWithUTF8String: "It does not contain the @"]);

or just

NSLog(@"It contains the @");

Note: Inside the @"..." construct, you should only use 7-bit ASCII symbols, see Apple's developer documentation.

Answer 4

This code should do the trick:

if([inputTextField.text rangeOfString:@"@"].location == NSNotFound) 
    NSLog(@"It does not contain the @"); 
else 
    NSLog(@"It contains the @");