For line Objective-C - objective-c

Question

I'm making an iOS code interpreter. I have all the checking done but as of now you can only enter one command. I want the user to be able to enter multiple commands into a UITextView. What I plan do with the text view is pass each line the my IF statement line.
Does anyone know of a way to say, pass each line one by one into a if statement line?
- (IBAction)runCommad:(id)sender {
//Alert
NSString *alertCheck = #"alert(";
NSRange alertCheckRange = [code.text rangeOfString : alertCheck];
//Logger
NSString *logCheck = #"log(";
NSRange logCheckRange = [code.text rangeOfString : logCheck];
if (alertCheckRange.location != NSNotFound) {
//If the compiler sees alert()...
NSString *commandEdit;
commandEdit = code.text;
commandEdit = [commandEdit stringByReplacingOccurrencesOfString:#"alert(" withString:#""];
commandEdit = [commandEdit stringByReplacingOccurrencesOfString:#")" withString:#""];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Syn0" message:commandEdit delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}else if (logCheckRange.location != NSNotFound) {
//If the compiler sees log()...
NSString *commandEdit;
commandEdit = code.text;
commandEdit = [commandEdit stringByReplacingOccurrencesOfString:#"log(" withString:#""];
commandEdit = [commandEdit stringByReplacingOccurrencesOfString:#")" withString:#""];
logFile = [NSString stringWithFormat:#"%#\n%#", logFile,commandEdit];
logTextView.text = logFile;
}
}

Answer 1

First, get your string components to evaluate:
NSString *text = [textView text];
NSArray *components = [text componentsSeperatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];
You can't use a switch with a string, so you'll need to check for each case with an if:
for (NSString *string in components)
{
if ([string isEqualToString:#"The first string you're matching"])
{
//Do something because you found first string
}
if([string isEqualToString:#"The second string you're matching"])
{
//Do something else
}
}
That's the idea.

Answer 2

Two suggestions, first if you are comfortable with blocks you can use NSString's:
(void)enumerateLinesUsingBlock:(void (^)(NSString *line, BOOL *stop))block
This method will call the block passing it each line in the original string in order. If you want to stop before processing each line you set stop to YES.
Alternatively you can use NSString's:
(NSArray *)componentsSeparatedByString:(NSString *)separator
This will break a string up into components based on separator. Use this in a for enumeration:
for(NSString *nextLine in [originalString componentsSeparatedByString:#"\n"])
{
// process nextLine, break from loop to stop before processing each line
}