问题
Is there any way to define the crop area rect using the camera image picker?
回答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
来源：https://stackoverflow.com/questions/2306861/ios-how-to-customize-the-crop-rect-in-uiimagepickercontroller-with-allowsediti