iOS 手机照片上传服务器方向不对的原因以及解决方法
2017-08-25 17:09
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苹果手机上传图片到服务器,发现图片方向不对,实践发现:
解决方法:
1.
设置相机的一个属性allowsEditing为YES,设了这个值,你拍完照片后会在照片上出现一个框框,这就是对照片的裁剪编辑。在相机的代理方法中取照片的时候就别用UIImagePickerControllerOriginalImage来取了,要用UIImagePickerControllerEditedImage。用这个key取出来的照片,它的imageOrientation是0,所以之后的任何裁剪、缩放操作都不会造成旋转。
2.由于开发中经常要对原图进行裁剪和压缩,所以第一种方法就不可取了,于是用第二种方法
//调整图片方向
+ (UIImage *)fixOrientation:(UIImage *)srcImg {
if (srcImg.imageOrientation ==UIImageOrientationUp)
return srcImg;
CGAffineTransform transform =CGAffineTransformIdentity;
switch (srcImg.imageOrientation) {
caseUIImageOrientationDown:
caseUIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,
srcImg.size.height);
transform = CGAffineTransformRotate(transform,M_PI);
break;
caseUIImageOrientationLeft:
caseUIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,0);
transform = CGAffineTransformRotate(transform,M_PI_2);
break;
caseUIImageOrientatio
4000
nRight:
caseUIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform,0, srcImg.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
caseUIImageOrientationUp:
caseUIImageOrientationUpMirrored:
break;
}
switch (srcImg.imageOrientation) {
caseUIImageOrientationUpMirrored:
caseUIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,0);
transform = CGAffineTransformScale(transform, -1,1);
break;
caseUIImageOrientationLeftMirrored:
caseUIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.height,0);
transform = CGAffineTransformScale(transform, -1,1);
break;
caseUIImageOrientationUp:
caseUIImageOrientationDown:
caseUIImageOrientationLeft:
caseUIImageOrientationRight:
break;
}
CGContextRef ctx =CGBitmapContextCreate(NULL, srcImg.size.width,
srcImg.size.height,
CGImageGetBitsPerComponent(srcImg.CGImage),0,
CGImageGetColorSpace(srcImg.CGImage),
CGImageGetBitmapInfo(srcImg.CGImage));
CGContextConcatCTM(ctx, transform);
switch (srcImg.imageOrientation) {
caseUIImageOrientationLeft:
caseUIImageOrientationLeftMirrored:
caseUIImageOrientationRight:
caseUIImageOrientationRightMirrored:
CGContextDrawImage(ctx,CGRectMake(0,0,srcImg.size.height,srcImg.size.width),
srcImg.CGImage);
break;
default:
CGContextDrawImage(ctx,CGRectMake(0,0,srcImg.size.width,srcImg.size.height),
srcImg.CGImage);
break;
}
CGImageRef cgimg =CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImageimageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
直接传入图片,得到纠正方向后的图片
1:原因: 相机拍照后直接取出来的UIimage(用UIImagePickerControllerOriginalImage取出),它本身的imageOrientation属性是3,即UIImageOrientationRight。如果这个图片直接使用则没事,但是如果对它进行裁剪、缩放等操作后,它的这个imageOrientation属性会变成0。此时这张图片用在别的地方就会发生旋转。(手机竖着拍则为UIImageOrientationRight,手机横着拍为UIImageOrientationUp)
2: imageOrientation是只读的,不能直接修改其值。解决方法:
1.
设置相机的一个属性allowsEditing为YES,设了这个值,你拍完照片后会在照片上出现一个框框,这就是对照片的裁剪编辑。在相机的代理方法中取照片的时候就别用UIImagePickerControllerOriginalImage来取了,要用UIImagePickerControllerEditedImage。用这个key取出来的照片,它的imageOrientation是0,所以之后的任何裁剪、缩放操作都不会造成旋转。
2.由于开发中经常要对原图进行裁剪和压缩,所以第一种方法就不可取了,于是用第二种方法
//调整图片方向
+ (UIImage *)fixOrientation:(UIImage *)srcImg {
if (srcImg.imageOrientation ==UIImageOrientationUp)
return srcImg;
CGAffineTransform transform =CGAffineTransformIdentity;
switch (srcImg.imageOrientation) {
caseUIImageOrientationDown:
caseUIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,
srcImg.size.height);
transform = CGAffineTransformRotate(transform,M_PI);
break;
caseUIImageOrientationLeft:
caseUIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,0);
transform = CGAffineTransformRotate(transform,M_PI_2);
break;
caseUIImageOrientatio
4000
nRight:
caseUIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform,0, srcImg.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
caseUIImageOrientationUp:
caseUIImageOrientationUpMirrored:
break;
}
switch (srcImg.imageOrientation) {
caseUIImageOrientationUpMirrored:
caseUIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.width,0);
transform = CGAffineTransformScale(transform, -1,1);
break;
caseUIImageOrientationLeftMirrored:
caseUIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, srcImg.size.height,0);
transform = CGAffineTransformScale(transform, -1,1);
break;
caseUIImageOrientationUp:
caseUIImageOrientationDown:
caseUIImageOrientationLeft:
caseUIImageOrientationRight:
break;
}
CGContextRef ctx =CGBitmapContextCreate(NULL, srcImg.size.width,
srcImg.size.height,
CGImageGetBitsPerComponent(srcImg.CGImage),0,
CGImageGetColorSpace(srcImg.CGImage),
CGImageGetBitmapInfo(srcImg.CGImage));
CGContextConcatCTM(ctx, transform);
switch (srcImg.imageOrientation) {
caseUIImageOrientationLeft:
caseUIImageOrientationLeftMirrored:
caseUIImageOrientationRight:
caseUIImageOrientationRightMirrored:
CGContextDrawImage(ctx,CGRectMake(0,0,srcImg.size.height,srcImg.size.width),
srcImg.CGImage);
break;
default:
CGContextDrawImage(ctx,CGRectMake(0,0,srcImg.size.width,srcImg.size.height),
srcImg.CGImage);
break;
}
CGImageRef cgimg =CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImageimageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
直接传入图片,得到纠正方向后的图片
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