Strange issue with NSSTring and NSTextField data in cocoa app

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C

Objective-C

iOS

I have a very basic cocoa osx app that has a text field and a button.

When you type something in to the text box and click the button it just sets a variable with the value in the text box -

- (IBAction)getText:(NSButton *)sender {
NSString *textFromField = _theText.stringValue;
}

If I type less then 7 characters in to the text box the variable gets set correctly.
If I type 7 to 11 characters in the text box the variable has garbage at the end.

Here is a copy of the All Output window -

(lldb) print textFromField
(NSString *) $0 = 0x000000010241c060 @"12345"
(lldb) print textFromField
(NSString *) $1 = 0x0000000102425260 @"1234567\xd0\xc4h$\x10"
(lldb) print textFromField
(NSString *) $2 = 0x0000000100510a30 @"123456789.\x05\x10"
(lldb) print textFromField
(NSString *) $3 = 0x00000001022370d0 @"123456789012"
(lldb)

You can see that if I type 12345 in to the text box, the variable shows 12345
But if I type 1234567 the variable shows 1234567\xd0\xc4h$\x10
It shows the extra garbage until you get up to 12 characters then it is fine again.

Any ideas why this happens?