Using stringByAppendingString to add character to existing string in Xcode/objective-C

Question

I am trying to add the character "1" to the existing value of a textbox "output" in Xcode objective-C.

I am trying to use the "stringByAppendingString" function, and have looked at some examples and can't seem to get this to work.

Is my syntax just wrong?

- (IBAction)pressOne:(id)sender {
    NSString *str1 = output.text;

    output.text = [str1  stringByAppendingString:[@"1"];

}

What's your problem? The code doesn't compile? Do you have an error when running the app? Or is the text box not updated? — sch
– sch, Commented Mar 17, 2012 at 17:16
your problem is related to NSString class so read first documentation of NSString. — aks.knit1108
– aks.knit1108, Commented Mar 17, 2012 at 19:26

jlehr · Accepted Answer · 2014-07-04 17:25:35Z

4

Get rid of the stray bracket before the @ symbol:

output.text = [str1 stringByAppendingString:@"1"];

answered Mar 17, 2012 at 17:12

jlehr

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Comments

sooper · Accepted Answer · 2012-03-17 17:12:05Z

1

try [str1 stringByAppendingString:@"1"];

answered Mar 17, 2012 at 17:12

sooper

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sch · Accepted Answer · 2012-03-17 17:11:32Z

0

Remove the brackets:

output.text = [str1  stringByAppendingString:@"1"];

answered Mar 17, 2012 at 17:11

sch

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