模态UIImagePickerController旋转的问题是在iOS开发中常见的一个bug。当我们使用UIImagePickerController来选择照片或者拍摄照片时,有时候会遇到图片旋转的问题。这个问题的原因是UIImagePickerController在显示图片时,会根据图片的方向信息进行旋转,但有些图片的方向信息可能不正确,导致显示时出现旋转。
为了解决这个问题,可以采取以下几种方法:
extension UIImage {
func fixOrientation() -> UIImage {
if self.imageOrientation == .up {
return self
}
UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
let normalizedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return normalizedImage ?? self
}
}
在获取到选中的图片后,可以调用该方法进行方向修正,然后再进行显示或保存。
extension UIImage {
func fixOrientation() -> UIImage {
guard let cgImage = self.cgImage else {
return self
}
if self.imageOrientation == .up {
return self
}
var transform = CGAffineTransform.identity
switch self.imageOrientation {
case .down, .downMirrored:
transform = transform.translatedBy(x: self.size.width, y: self.size.height)
transform = transform.rotated(by: CGFloat.pi)
case .left, .leftMirrored:
transform = transform.translatedBy(x: self.size.width, y: 0)
transform = transform.rotated(by: CGFloat.pi / 2)
case .right, .rightMirrored:
transform = transform.translatedBy(x: 0, y: self.size.height)
transform = transform.rotated(by: -CGFloat.pi / 2)
default:
break
}
switch self.imageOrientation {
case .upMirrored, .downMirrored:
transform = transform.translatedBy(x: self.size.width, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
case .leftMirrored, .rightMirrored:
transform = transform.translatedBy(x: self.size.height, y: 0)
transform = transform.scaledBy(x: -1, y: 1)
default:
break
}
guard let colorSpace = cgImage.colorSpace,
let context = CGContext(data: nil, width: Int(self.size.width), height: Int(self.size.height), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: 0, space: colorSpace, bitmapInfo: cgImage.bitmapInfo.rawValue) else {
return self
}
context.concatenate(transform)
switch self.imageOrientation {
case .left, .leftMirrored, .right, .rightMirrored:
context.draw(cgImage, in: CGRect(x: 0, y: 0, width: self.size.height, height: self.size.width))
default:
context.draw(cgImage, in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
}
guard let newCGImage = context.makeImage() else {
return self
}
return UIImage(cgImage: newCGImage)
}
}
在获取到选中的图片后,可以调用该方法进行方向修正,然后再进行显示或保存。
以上是解决模态UIImagePickerController旋转问题的几种方法,可以根据具体需求选择适合的方法进行实现。
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