我使用图像选择器捕捉图像，在那时图像是在它的实际位置。 但上传的服务器后，它成为水平。 我没有得到任何线索，为什么发生这种情况。
这里是我的代码
NSString *urlString = @"Url";
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];
NSMutableData *body = [NSMutableData data];
NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];
// file
NSData *imageData = UIImageJPEGRepresentation(image.image, 90);
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[[NSString stringWithString:@"Content-Disposition: attachment; name=\"user_photo\"; filename=\"photoes.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"%@.jpg\"\r\n",@"ImageNmae"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"desc\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:ImageDesc.text] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
// close form
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// set request body
[request setHTTPBody:body];
//return and test
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
我发现这里的解决方法是代码。
- (UIImage *)scaleAndRotateImage:(UIImage *)image { // here we rotate the image in its orignel
int kMaxResolution = 640; // Or whatever
CGImageRef imgRef = image.CGImage;
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGAffineTransform transform = CGAffineTransformIdentity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = roundf(bounds.size.width / ratio);
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = roundf(bounds.size.height * ratio);
}
}
CGFloat scaleRatio = bounds.size.width / width;
CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
CGFloat boundHeight;
UIImageOrientation orient = image.imageOrientation;
switch(orient) {
case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored: //EXIF = 5
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationLeft: //EXIF = 6
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationRightMirrored: //EXIF = 7
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
case UIImageOrientationRight: //EXIF = 8
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
}
UIGraphicsBeginImageContext(bounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
}
else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}
CGContextConcatCTM(context, transform);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageCopy;
}
方向（在你的情况下旋转）是在图像的EXIF数据。 您的服务器上，您需要在iOS或预旋转图像后使其旋转。
在iOS上可以检查imageOrientation财产UIImage 。
你可以用剪断（你需要设置大小或者更改代码部分大小可能是原始大小。）代码转换：
- (CGAffineTransform)transformForOrientation:(CGSize)newSize {
CGAffineTransform transform = CGAffineTransformIdentity;
switch (self.imageOrientation) {
case UIImageOrientationDown: // EXIF = 3
case UIImageOrientationDownMirrored: // EXIF = 4
transform = CGAffineTransformTranslate(transform, newSize.width, newSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft: // EXIF = 6
case UIImageOrientationLeftMirrored: // EXIF = 5
transform = CGAffineTransformTranslate(transform, newSize.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight: // EXIF = 8
case UIImageOrientationRightMirrored: // EXIF = 7
transform = CGAffineTransformTranslate(transform, 0, newSize.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
}
switch (self.imageOrientation) {
case UIImageOrientationUpMirrored: // EXIF = 2
case UIImageOrientationDownMirrored: // EXIF = 4
transform = CGAffineTransformTranslate(transform, newSize.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored: // EXIF = 5
case UIImageOrientationRightMirrored: // EXIF = 7
transform = CGAffineTransformTranslate(transform, newSize.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
}
return transform;
}
当然，你需要的是应用以某种方式转换到你的UIImage。 但我想你会发现，在计算器上的其他问题。 也许开始在这里 。
它是为媒体上传一个很好的查询。
当你捕捉设备的图像修复它的特定图像的方向。 假设你捕捉图像在横向模式及当你告诉这个与你的ImageView它显示自己在人像模式，因为基本设备配置功能两者的图像（横向和纵向），然后在实际存储在景观可能假装自己作为肖像支持。 作为结果它可节省超过服务器景观当您在肖像在UI（ImageView的）显示图像。 最后1）图像设备上的横向书写。 2）你有垂直于UI显示它由于纵向模式活性中的应用。 3）但是，当将在服务器上写它需要它的原始模式（水平）。
因此，按照最好的建议，你应该在应用适当的模式显示媒体。
NSData *imageData = UIImageJPEGRepresentation(image.image, 90);
是不是90的旋转角度？
阅读文档后编辑
NSData *imageData = UIImageJPEGRepresentation(image.image, 90);
看起来像90应该是0.9。 可能不是问题，但。
文章来源: Image became horizontal after successfully uploaded on server using Http Post
