iOS - How to customize the crop rect in UIImagePickerController with allowsEditing on?

Question

有没有办法使用相机图像选择器定义裁剪区域rect？

Answer 1

Unfortunately, no.

You have to implement a custom cropping GUI to get anything other than the default, as stated in the Camera Programming Topics for iOS:

"When using built-in editing controls, the image picker controller enforces certain options. For still images, the picker enforces a square cropping as well as a maximum pixel dimension. For movies, the picker enforces a maximum movie length and resolution. If you want to let the user edit full-size media, or specify custom cropping, you must provide your own editing UI."

http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/CameraAndPhotoLib_TopicsForIOS/Articles/PickinganItemfromthePhotoLibrary.html#//apple_ref/doc/uid/TP40010408-SW1