旋转图像后如何合并两个图像？ [英] How to merge two images after rotate the image?

问题描述

旋转后图像如何合并旋转图像？我使用下面的代码，它在图像旋转之前工作正常。如何解决这个问题。请帮我。在此先感谢。

After rotate the image how to merge the rotation image? I using the below code, Its work fine for before the image rotation. How to fix this issue . Please help me. Thanks in advance.

CGRect backgroundImageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
CGRect foregroundImageRect = CGRectMake(rsImageView.frame.origin.x, rsImageView.frame.origin.y, rsImageView.frame.size.width, rsImageView.frame.size.height);

[backgroundImageView.image drawInRect:backgroundImageRect];
[rsImageView.image drawInRect:foregroundImageRect];
overlappedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

推荐答案

添加此方法在轮换后调用此方法：

Add this method call this after rotation:

-(UIImage *)getMergedImage
{
 UIImage mergedImage;
 UIGraphicsBeginImageContext(backgroundImageView.frame.size)
 [backgroundImageView.layer  renderInContext:UIGraphicsGetCurrentContext];//bacgroundImageView here
 UIImage overLappedImage = [self getOverlappedImage];
 if(overLappedImage)
 {
   //CGRectMake(0,0,rsImageView.frame.width,rsImageView.frame.height)
   [overLappedImage drawInRect:rsImageView.frame blendMode:kCGBlendModeNormal alpha:0.8];//TopMostImageView here
 }
 mergedImage = UIGraphicsGetImageFromCurrentImageContext(); 
 UIGraphicsEndImageContext();
 return mergedImage;
}

---

添加此方法以获取重叠图像。

---

Add this method to get overlappped Image.

-(UIImage *)getOverlappedImage
{
  UIImage overlappedImage;
  UIGraphicsBeginImageContext(rsImageView.frame.size)
  [rsImageView.layer renderInContext:UIGraphicsGetCurrentContext]; //TopMostImageView here
  overlappedImage = UIGraphicsGetImageFromCurrentImageContext(); 
  UIGraphicsEndImageContext();
  return overlappedImage;
}

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