捉襟见肘之自定义自拍相机AVFoundation

因为上篇的问题的，我搜索到解决方法：

http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload

Objective-C 源代码：

 #import <UIKit/UIKit.h>

 @interface UIImage(fixOrientation)
 - (UIImage *)fixOrientation;
 @end

UIImage+FixOrientation.h

 #import "UIImage+FixOrientation.h"

 @implementation UIImage (fixOrientation)

 - (UIImage *)fixOrientation {

     // No-op if the orientation is already correct
     if (self.imageOrientation == UIImageOrientationUp) return self;

     // 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 (self.imageOrientation)
     {
         case UIImageOrientationDown:
         case UIImageOrientationDownMirrored:
             transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height);
             transform = CGAffineTransformRotate(transform, M_PI);
             break;

         case UIImageOrientationLeft:
         case UIImageOrientationLeftMirrored:
             transform = CGAffineTransformTranslate(transform, self.size.width, );
             transform = CGAffineTransformRotate(transform, M_PI_2);
             break;

         case UIImageOrientationRight:
         case UIImageOrientationRightMirrored:
             transform = CGAffineTransformTranslate(transform, , self.size.height);
             transform = CGAffineTransformRotate(transform, -M_PI_2);
             break;
         case UIImageOrientationUp:
         case UIImageOrientationUpMirrored:
             break;
     }

     switch (self.imageOrientation)
     {
         case UIImageOrientationUpMirrored:
         case UIImageOrientationDownMirrored:
             transform = CGAffineTransformTranslate(transform, self.size.width, );
             transform = CGAffineTransformScale(transform, -, );
             break;

         case UIImageOrientationLeftMirrored:
         case UIImageOrientationRightMirrored:
             transform = CGAffineTransformTranslate(transform, self.size.height, );
             transform = CGAffineTransformScale(transform, -, );
             break;
         case UIImageOrientationUp:
         case UIImageOrientationDown:
         case UIImageOrientationLeft:
         case UIImageOrientationRight:
             break;
     }

     // Now we draw the underlying CGImage into a new context, applying the transform
     // calculated above.
     CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height,
                                              CGImageGetBitsPerComponent(self.CGImage), ,
                                              CGImageGetColorSpace(self.CGImage),
                                              CGImageGetBitmapInfo(self.CGImage));
     CGContextConcatCTM(ctx, transform);
     switch (self.imageOrientation)
     {
         case UIImageOrientationLeft:
         case UIImageOrientationLeftMirrored:
         case UIImageOrientationRight:
         case UIImageOrientationRightMirrored:
             // Grr...
             CGContextDrawImage(ctx, CGRectMake(,,self.size.height,self.size.width), self.CGImage);
             break;

         default:
             CGContextDrawImage(ctx, CGRectMake(,,self.size.width,self.size.height), self.CGImage);
             break;
     }

     // And now we just create a new UIImage from the drawing context
     CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
     UIImage *img = [UIImage imageWithCGImage:cgimg];
     CGContextRelease(ctx);
     CGImageRelease(cgimg);
     return img;
 }

 @end

UIImage+FixOrientation.m

自定义相机完成，总结在下一篇：CoreImage初级相机图片效果处理

代码分享一下：https://github.com/nLoser/LVCamera

。。。。。。