你应该做的是在应对之前修复图像方向,我遇到了同样的问题,我正在使用 swift 所以我不得不改变这个答案:
上传后iOS UIImagePickerController结果图像方向
但是代码工作得很好。请记住,它返回一个图像而不是编辑图像,因为那个简单的错误,我努力让它正确。顺便说一句,你不应该使用 UIImageOrientation 而是 UIImageOrientation.rawValue,至少在 swift 中是这样。
我将在此处留下 swift 的代码,希望对您有所帮助:
extension UIImage {
public func fixOrientation() -> UIImage?{
if self.imageOrientation.rawValue == UIImageOrientation.Up.rawValue {
return self
}
var transform : CGAffineTransform = CGAffineTransformIdentity
switch self.imageOrientation.rawValue {
case UIImageOrientation.Down.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI))
case UIImageOrientation.DownMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI))
case UIImageOrientation.Left.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, 0)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))
case UIImageOrientation.LeftMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, 0)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))
case UIImageOrientation.Right.rawValue:
print("working on right orientation")
transform = CGAffineTransformTranslate(transform, 0, self.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))
case UIImageOrientation.RightMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, 0, self.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))
case UIImageOrientation.Up.rawValue: break
case UIImageOrientation.UpMirrored.rawValue: break
default: break
}
switch self.imageOrientation.rawValue {
case UIImageOrientation.UpMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, 0)
transform = CGAffineTransformScale(transform, -1, 1)
case UIImageOrientation.DownMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.width, 0)
transform = CGAffineTransformScale(transform, -1, 1)
case UIImageOrientation.LeftMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.height, 0)
transform = CGAffineTransformScale(transform, -1, 1)
case UIImageOrientation.RightMirrored.rawValue:
transform = CGAffineTransformTranslate(transform, self.size.height, 0)
transform = CGAffineTransformScale(transform, -1, 1)
case UIImageOrientation.Up.rawValue: break
case UIImageOrientation.Down.rawValue: break
case UIImageOrientation.Left.rawValue: break
case UIImageOrientation.Right.rawValue: break
default: break
}
let bitmapInfo = CGImageGetBitmapInfo(self.CGImage)
let ctx = CGBitmapContextCreate(nil, Int(self.size.width), Int(self.size.height), CGImageGetBitsPerComponent(self.CGImage), 0, CGImageGetColorSpace(self.CGImage),
bitmapInfo.rawValue)
CGContextConcatCTM(ctx, transform)
switch self.imageOrientation {
case UIImageOrientation.Left:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height, self.size.width), self.CGImage)
case UIImageOrientation.LeftMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height, self.size.width), self.CGImage)
case UIImageOrientation.Right:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height, self.size.width), self.CGImage)
case UIImageOrientation.RightMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height, self.size.width), self.CGImage)
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.width, self.size.height), self.CGImage)
}
let cgimg = CGBitmapContextCreateImage(ctx)
let image = UIImage(CGImage: cgimg!)
return image
}
}