On Mar 16, 2010, at 18:55:02, Jens Alfke wrote:
>
> On Mar 16, 2010, at 6:19 PM, Rick Mann wrote:
>
>> I'm currently using an NSTextView, and calling the following to append text:
>>
>> NSString* existingText = self.output.string;
>> NSRange r = NSMakeRange(existingText.length, 0);
>> [self.output replaceCharactersInRange: r withString: s];
>
> That line shouldn’t compile, or rather, you should get a warning about it,
> since NSString doesn’t respond to that message. And you shouldn’t leave
> warnings like that in your code, since they’re usually telling you something
> important. In this case, NSTextView’s -string property has a return type of
> NSString, implying that the object is immutable. It happens that the
> implementation returns an NSMutableString, which is why your code doesn’t
> bomb at runtime, but NSTextView is not expecting you to go mutating its
> internal storage behind its back, which is why it doesn’t know to redisplay
> itself.
Jens,
There's no warning because there's no difference between
NSString* existingText = self.output.string;
and
NSString* existingText = [self.output string];
even without a declared property. I prefer the former style. You'll not that I
don't actually do anything with the string other than measure its length.
Moreover, the return type is NSString*, so using it in this manner is perfectly
valid. (I couldn't see any other way to get a range representing the end of the
buffer. Nor is there an "append" operation.)
But now I see that NSTextStorage is a mutable string I can append to. Thanks!
> What you should do instead is use the -textStorage property (which does
> return a mutable attributed string), and bracket your changes with
> -beginEditing and -endEditing.
>
> —Jens
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