Is it valid to ignore an return value of an method in objective-c?

Question

For example, when I call a method that returns an value, but I'm not interested in this at all, can I safely ignore that? Example, instead of: ``` CGSize size = [str sizeWithFont:myFont minFontSize:19.0f actualFontSize:&actualFontSize forWidth:150.0f lineBreakMode:UILineBreakModeClip]; ``` ...do this: ``` [str sizeWithFont:myFont minFontSize:19.0f actualFontSize:&actualFontSize forWidth:150.0f lineBreakMode:UILineBreakModeClip]; ``` I don't need the `CGSize size` but only `actualFontSize`, which is passed in by reference. Now the problem is that XCode gives me a warning if I don't read `size`. I don't want to surpress those warnings, and at the same time I don't want them at all. So I wonder if it's okay if I just don't assign the return value to anything?

Accepted Answer

I didn't think Xcode worried about it at all. No, it's not going to do anything bad.

If you want to cleanly shut up the warning, cast the return value to void:

```
(void)[str sizeWithFont:myFont minFontSize:19.0f actualFontSize:&actualFontSize forWidth:150.0f lineBreakMode:UILineBreakModeClip];
```

Is it valid to ignore an return value of an method in objective-c?

Solution

Problem