iOS Need help with string concatenation please

[guyddor]

Hi,

I want to develop an app that will take the value from UITextField and use it
in a url like that:

http://www. the value from UITextField .com/

How do I do that?

 

[dejo]

Use NSString's stringByAppendingString: or stringByAppendingFormat:

 

[zrbecker]

This should work.

NSString urlString = [NSString stringWithFormat:"http://www.%@.com/", myUITextBox.text];

 

[moral-hazard]

This should work.

NSString [B][COLOR="Red"]*[/COLOR][/B]urlString = [NSString stringWithFormat:"http://www.%@.com/", myUITextBox.text];

I'll second this approach (with the minor correction I added ). +stringWithFormat is good because it gives you an autoreleased string.

 

[guyddor]

Thanks! but when I put the code...

The button get stuck

What to do?

 

[dejo]

What to do?

Explain the issue in more detail. Like, what do you mean the button got "stuck"? Any errors or warning, run-time or build? Perhaps include the button-action code...

 

[guyddor]

I don't get warnings but...

Look at the attachment file

 

[dejo]

Perhaps include the button-action code...

Restated.

 

[moral-hazard]

Your program appears to be crashing. Check the stack trace. I've only seen buttons get stuck like that on a crash.

 

[guyddor]

I don't get any warnings

What to do?

Edit:

I got 2 warnings:

-passing argument 1 of 'stringWithFormat': from incompatible pointer type

-unused variable 'urlString'

 

[dejo]

What to do?

Keep asking for help without providing any code?

 

[guyddor]

Here the MainView.m file code

#import "MainView.h"

@implementation MainView
- (IBAction)searchGoogle {

NSString *urlString = [NSString stringWithFormat:"http://www.%@.com/", userTextField.text];

}

- (BOOL)textFieldShouldReturnUITextField *)textField {
[textField resignFirstResponder];
return YES;
}

@end

What to do?

This is the only code that I have in my project

 

[dejo]

What to do?

Two things.
1) You need to prefix your string with the @ character for Objective-C to treat it as a constant NSString object.

NSString *urlString = [NSString stringWithFormat:[COLOR="Red"]@[/COLOR]"http://www.%@.com/", userTextField.text];

2) Use [ code ] tags rather than quotes.

 

[guyddor]

Now I get the warning:

warning: unused variable 'urlString'

What should I do?

 

[dejo]

What should I do?

Step away from the real coding, go (re)learn the basics of Objective-C and iPhone dev before you continue. Also, it helps to post specific questions rather than generic ones like "What should I do?" Hope that helps.