使用ALAssetLibrary快速了解图像资源是横向还是纵向？

Question

I get asset using ALAssetLibrary. Is there way to know is this image landscape or portrait not loading the image but having only asset?

[asset thumbnail ] returns (75,75) size image,so its doesn't help.

To load fullScreen or fullResolution image and compare its width and height is to heavy .

To load metadata and than pixelHeight and Width is also heavy.

So can someone help?

Answer 1

You can use the orientation method of ALAssetRepresentation (available since iOS 4.0). So your call would be something like this.

ALAssetOrientation orientation = [[asset defaultRepresentation] orientation];

The performance of this call should be fine.

Cheers,

Hendrik