让用户在iOS中裁剪图像 [英] let user crop image in iOS

问题描述

objective-c中是否有内置功能可以像iOS照片库中那样进行图像裁剪？我尝试过在UIImagePickerController中启用编辑功能，但操作不一样。谢谢！

Is there a built in function in objective-c to do image cropping like the one in iOS photo gallery? I have tried enabling editing in UIImagePickerController, but it doesn't do the same. Thanks!

推荐答案

有很多使用Core Graphics函数裁剪图像的方法，最基本的方法是：

there are quite a few ways to crop images using the Core Graphics functions, the most basic one would be:

CGRect cropRect = CGRectMake(0, 0, 100, 100);
CGImageRef cropped_img = CGImageCreateWithImageInRect(yourUIImage.CGImage, cropRect)

这篇关于让用户在iOS中裁剪图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！