Although iPhoto for iOS isn't quite as robust as its OS X counterpart, it's a capable image editor-and it can do a few cool tricks you simply can't replicate on your Mac. Straighten Your Photos iPhoto for iOS allows you to straighten your photos in a few smart ways. The first is by auto-detecting a strong horizon line. Open iPhoto, choose a photo, and then tap Edit. Now tap the Crop & Straighten icon in the bottom left. If the photo displays a white line across it with icons at either end, that means the software has detected a horizon line. To proceed with straightening, simply tap the arrow icon at the right.
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机译：尽管iOS版iPhoto的功能不如OS X强大，但它是功能强大的图像编辑器-它可以做一些很酷的技巧，而这些技巧是您无法在Mac上复制的。整理照片iPhoto for iOS允许您以几种智能方式整理照片。首先是通过自动检测一条强视线。打开iPhoto，选择一张照片，然后点击“编辑”。现在点击左下方的“裁剪和拉直”图标。如果照片两端都显示一条白线并带有图标，则表明该软件已检测到水平线。要进行拉直，只需点击右侧的箭头图标。
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