本文主要是介绍拍照竖屏变横屏问题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
用苹果手机竖屏拍照，传到后台变成横屏的问题，需要将照片旋转下。
-(UIImage *)fixOrientation:(UIImage *)aImage {// No-op if the orientation is already correctif (aImage.imageOrientation ==UIImageOrientationUp)return aImage;// We need to calculate the proper transformation to make the image upright.// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.CGAffineTransform transform =CGAffineTransformIdentity;switch (aImage.imageOrientation) {case UIImageOrientationDown:case UIImageOrientationDownMirrored:transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);transform = CGAffineTransformRotate(transform, M_PI);break;case UIImageOrientationLeft:case UIImageOrientationLeftMirrored:transform = CGAffineTransformTranslate(transform, aImage.size.width,0);transform = CGAffineTransformRotate(transform, M_PI_2);break;case UIImageOrientationRight:case UIImageOrientationRightMirrored:transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);transform = CGAffineTransformRotate(transform, -M_PI_2);break;default:break;}switch (aImage.imageOrientation) {case UIImageOrientationUpMirrored:case UIImageOrientationDownMirrored:transform = CGAffineTransformTranslate(transform, aImage.size.width,0);transform = CGAffineTransformScale(transform, -1, 1);break;case UIImageOrientationLeftMirrored:case UIImageOrientationRightMirrored:transform = CGAffineTransformTranslate(transform, aImage.size.height,0);transform = CGAffineTransformScale(transform, -1, 1);break;default:break;}// Now we draw the underlying CGImage into a new context, applying the transform// calculated above.CGContextRef ctx =CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,CGImageGetBitsPerComponent(aImage.CGImage),0,CGImageGetColorSpace(aImage.CGImage),CGImageGetBitmapInfo(aImage.CGImage));CGContextConcatCTM(ctx, transform);switch (aImage.imageOrientation) {case UIImageOrientationLeft:case UIImageOrientationLeftMirrored:case UIImageOrientationRight:case UIImageOrientationRightMirrored:// Grr...CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);break;default:CGContextDrawImage(ctx,CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);break;}// And now we just create a new UIImage from the drawing contextCGImageRef cgimg =CGBitmapContextCreateImage(ctx);UIImage *img = [UIImage imageWithCGImage:cgimg];CGContextRelease(ctx);CGImageRelease(cgimg);return img;
}
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