我制作了一个iphone应用程序来捕捉来自相机的图像并在下一个视图中设置该图像。但问题是图像是旋转的。即景观图像成为potraite和protraite图像成为景观。 我已经提到了许多代码但无法获得解决方案。
我的代码是：
- (void)btnCapturePressed
{
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
picker=[[UIImagePickerController alloc] init];
picker.delegate=self;
[picker setAllowsEditing:YES];
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
//[self.navigationController pushViewController:(UIViewController *)ipc animated:YES];
[self presentModalViewController:picker animated:YES];
[picker release];
}
}
-(void) imagePickerController:(UIImagePickerController *) picker didFinishPickingMediaWithInfo :(NSDictionary *)info
{
UIImage *imageToScale=[info objectForKey:UIImagePickerControllerOriginalImage];
imgView = [[UIImageView alloc] initWithImage:imageToScale];
[picker presentModalViewController:cropper animated:YES];
}
我也提到了link。有同样的问题，但找不到解决方案。
请帮帮我。
感谢。
答案 0 :(得分：4)
因此，在图像时，请存储设备的方向并将其作为参数传递给下面的方法
这里只给出方法的任何名称并传递参数orientation
switch (orientation) {
case UIDeviceOrientationPortrait:
[featureLayer setAffineTransform:CGAffineTransformMakeRotation(DegreesToRadians(0.))];
break;
case UIDeviceOrientationPortraitUpsideDown:
[featureLayer setAffineTransform:CGAffineTransformMakeRotation(DegreesToRadians(180.))];
break;
case UIDeviceOrientationLandscapeLeft:
[featureLayer setAffineTransform:CGAffineTransformMakeRotation(DegreesToRadians(90.))];
break;
case UIDeviceOrientationLandscapeRight:
[featureLayer setAffineTransform:CGAffineTransformMakeRotation(DegreesToRadians(-90.))];
break;
case UIDeviceOrientationFaceUp:
case UIDeviceOrientationFaceDown:
default:
break; // leave the layer in its last known orientation
}
我在这里使用的宏DegreesToRadians()如下
static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};
这肯定会奏效。
快乐编码：）
修改
如果上述代码不能正常使用，请使用此代码
@interface UIImage (RotationMethods)
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees;
@end
@implementation UIImage (RotationMethods)
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
// calculate the size of the rotated view's containing box for our drawing space
UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
rotatedViewBox.transform = t;
CGSize rotatedSize = rotatedViewBox.frame.size;
// Create the bitmap context
UIGraphicsBeginImageContext(rotatedSize);
CGContextRef 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, rotatedSize.height/2);
// // Rotate the image context
CGContextRotateCTM(bitmap, DegreesToRadians(degrees));
// Now, draw the rotated/scaled image into the context
CGContextScaleCTM(bitmap, 1.0, -1.0);
CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
@end
然后调用上面的函数
switch (orientation) {
case UIDeviceOrientationPortrait:
image = [image imageRotatedByDegrees:0];
break;
case UIDeviceOrientationPortraitUpsideDown:
image = [image imageRotatedByDegrees:180];
break;
case UIDeviceOrientationLandscapeLeft:
image = [image imageRotatedByDegrees:-90];
break;
case UIDeviceOrientationLandscapeRight:
image = [image imageRotatedByDegrees:90];
break;
case UIDeviceOrientationFaceUp:
case UIDeviceOrientationFaceDown:
default:
break; // leave the layer in its last known orientation
}
如果图像不是必需的方向，那么在上述所有imageRotatedByDegrees的参数中加上90（即如果它是0则为0 + 90）或者你需要的。
编辑1
UIDeviceOrientation curDeviceOrientation = [[UIDevice currentDevice] orientation];
答案 1 :(得分：3)
我正在努力解决这个问题，但找到了一个更简单的解决方案：
AVCaptureConnection *vc = [self.snapper connectionWithMediaType:AVMediaTypeVideo];
// THIS IS THE KEY LINE!!!!!!!!!!!!!!!!!!!!!
[vc setVideoOrientation:[self interfaceToVideoOrientation]];
[self.snapper captureStillImageAsynchronouslyFromConnection:vc
completionHandler:
^(CMSampleBufferRef buf, NSError *err) {
NSData* data = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:buf];
UIImage* im = [UIImage imageWithData:data];
// Do something with the image.
}];
- (AVCaptureVideoOrientation)interfaceToVideoOrientation
{
switch ([UIApplication sharedApplication].statusBarOrientation)
{
case UIInterfaceOrientationPortrait:
return AVCaptureVideoOrientationPortrait;
case UIInterfaceOrientationPortraitUpsideDown:
return AVCaptureVideoOrientationPortraitUpsideDown;
case UIInterfaceOrientationLandscapeRight:
return AVCaptureVideoOrientationLandscapeRight;
case UIInterfaceOrientationLandscapeLeft:
return AVCaptureVideoOrientationLandscapeLeft;
default:
return AVCaptureVideoOrientationPortrait;
}
}
在捕捉之前设置视频方向现在解决了我的问题，图像以错误的方向出现。
答案 2 :(得分：1)
我通过苹果论坛（https://discussions.apple.com/thread/1537011?start=0&tstart=0）引用讨论，并找到了以下解决方案;它对我很有用;我只是复制粘贴它就像宝石一样工作;
-(UIImage *) scaleAndRotateImage(UIImage *)image
{
int kMaxResolution = 320; // 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 = bounds.size.width / ratio;
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = 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;
}
答案 3 :(得分：1)
我有同样的问题，这对我有帮助。希望它也能帮到你。我花了2分钟来解决这个问题。 http://xcodetipss.blogspot.com/2012/04/image-rotated-when-taken-from-camera.html