iOS mystr appendString: sender

[FreedomApple]

Hello,
I'm very new to Objective C. I'm trying to figure out why when I press my UIButton it crashes when sender is in appendString: sender. Am I missing something?
If I change sender to a string @"World!" it works fine.

- (IBAction) search:(id)sender{
    NSMutableString* mystr = [NSMutableString stringWithString: @"Hello"];
    [mystr appendString: sender];
}

Thank You

 

[FreedomApple]

this also doesn't work.

-(IBAction)linkButtonClick:(id)sender {
NSString* launchUrl = sender;
[[UIApplication sharedApplication] openURL:[NSURL URLWithString: launchUrl]];
}

 

[lefooey]

- (IBAction) search:(id)sender{
    NSMutableString* mystr = [NSMutableString stringWithString: @"Hello"];
    [mystr appendString: sender];
}

sender is probably your UIButton, so it's not valid to pass as an NSString reference to NSMutableString appendString:

Perhaps you were looking for sender.title.text?

 

[FreedomApple]

Thanks for the Reply.
What I read is that the sender is a ID not a string.

Here is what I ended up having to do.

NSString *title = [(UIButton *)sender currentTitle];

works now.