iOS /目标C / UIImage：CGSize为什么导致崩溃？

Question

I have the following line in a category designed to crop an image:

CGSize mainImageSize = self.size;

When I call the category, the app crashes at this point. The console shows:

size    CGSize  (width=142, height=142) 
mainImageSize   CGSize  (width=2.121995791459338E-314, height=2.121995791459338E-314)

Similarly, if you hold the cursor over the self.size, it displays 142,142 while if you hold it over mainImageSize it shows 2.212..., 2.212... etc.

While I can guess why self.size might equal 142x142--it is approximately the image size of the view (150x150) in the view controller, I would interpret this line to mean that we are setting a new variable mainImageSize to the construct CGSize, so I have no idea where the 2.12.. is coming from. As far as I know mainImageSize is not a reserved word although maybe it is. I have certainly not defined it as a variable.

This category is called with the following line in the didFinishPickingMediaWithInfo method where chosen image is the image selected:

UIImage *thumbnail = [chosenImage createThumbnailToFillSize:CGSizeMake(side, side)];

Can anyone walk me through what is actually happening here and hopefully suggest a way to do this that does not crash?

Thank you in advance for any suggestions.

Answer 1

The:

mainImageSize   CGSize  (width=2.121995791459338E-314, height=2.121995791459338E-314)

you obtain seems to be sort of FLOAT_MIN value, are you sure that the instance exists? what about the method you use to create the thumb are you sure that is working fine?