目标:从正确的位置从imagePickerController获取更大的编辑图像。CGImageCreateWithImageInRect与UIImagePickerControllerOriginalImage不能很好地工作
问题:任何人都可以请帮助我得到图像,并告诉我我的代码是错误的吗?在我的调查中,CGImageCreateWithImageInRect与UIImagePickerControllerCropRect看起来很奇怪。但不知道......
为什么:信息[UIImagePickerControllerEditedImage]太小了,所以我想用信息[UIImagePickerControllerEditedImage]。
问题:裁剪图像在代码中返回错误的位置编辑图像。
其他信息:原始图像旋转90°,所以我用imageRotatedByDegrees功能在网络上找到,而且效果很好。
class PhotoViewController: UIImagePickerControllerDelegate {
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
let originalImage = info[UIImagePickerControllerOriginalImage] as? UIImage
let rotatedOriginalImage = originalImage!.imageRotatedByDegrees(90, flip: false)
let croppedImage = UIImage(CGImage: CGImageCreateWithImageInRect(rotatedOriginalImage.CGImage, info[UIImagePickerControllerCropRect]!.CGRectValue()))
}
}
// For rotating UIImagePickerControllerOriginalImage
// source: http://blog.ruigomes.me/how-to-rotate-an-uiimage-using-swift/
extension UIImage {
public func imageRotatedByDegrees(degrees: CGFloat, flip: Bool) -> UIImage {
let radiansToDegrees: (CGFloat) -> CGFloat = {
return $0 * (180.0/CGFloat(M_PI))
}
let degreesToRadians: (CGFloat) -> CGFloat = {
return $0/180.0 * CGFloat(M_PI)
}
// calculate the size of the rotated view's containing box for our drawing space
let rotatedViewBox = UIView(frame: CGRect(origin: CGPointZero, size: size))
let t = CGAffineTransformMakeRotation(degreesToRadians(degrees));
rotatedViewBox.transform = t
let rotatedSize = rotatedViewBox.frame.size
// Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize)
let bitmap = UIGraphicsGetCurrentContext()
// Move the origin to the middle of the image so we will rotate and scale around the center.
CGContextTranslateCTM(bitmap, rotatedSize.width/2.0, rotatedSize.height/2.0);
// // Rotate the image context
CGContextRotateCTM(bitmap, degreesToRadians(degrees));
// Now, draw the rotated/scaled image into the context
var yFlip: CGFloat
if(flip){
yFlip = CGFloat(-1.0)
} else {
yFlip = CGFloat(1.0)
}
CGContextScaleCTM(bitmap, yFlip, -1.0)
CGContextDrawImage(bitmap, CGRectMake(-size.width/2, -size.height/2, size.width, size.height), CGImage)
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage
}
}