ios - Objective-C:如何在锁定人像方向锁定后拍摄后固定图像方向

Question

当我从相机横向拍摄照片时(右侧)，图像仍为纵向。我想以从人像锁定状态下从相机拍摄的方向旋转图像。如何才能做到这一点？

Answer 1

在保存或显示图像之前，请尝试以下代码。

    - (UIImage*) rotateImage:(UIImage* )originalImage {

    UIImageOrientation orientation = originalImage.imageOrientation;

    UIGraphicsBeginImageContext(originalImage.size);

    [originalImage drawAtPoint:CGPointMake(0, 0)];
    CGContextRef context = UIGraphicsGetCurrentContext();

     if (orientation == UIImageOrientationRight) {
         CGContextRotateCTM (context, [self radians:90]);
     } else if (orientation == UIImageOrientationLeft) {
         CGContextRotateCTM (context, [self radians:90]);
     } else if (orientation == UIImageOrientationDown) {
         // NOTHING
     } else if (orientation == UIImageOrientationUp) {
         CGContextRotateCTM (context, [self radians:0]);
     }

      return UIGraphicsGetImageFromCurrentImageContext();}

- (CGFloat) radians:(int)degree {
    return (degree/180)*(22/7);
  }