将多个图像合并为单个图像

Question

我希望将多个图像合并为单张图像，同时保存到相机胶卷。 实际上，我在不同的视图中有不同的图像。我在一个视图中有3个图像，在选择4个帧的布局时也有4个图像。有人帮我如何合并它们。

我的分享代码：

 CGRect rect=[self.previewView bounds];
 UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0f);
 CGSize size=CGSizeMake(self.previewView.frame.size.width, self.previewView.frame.size.height);
 if(selectButtonTag==2)
 {
 [self.doubleFrameViewcapturedImg1.image drawInRect:CGRectMake(0, 0, size.width, size.height)blendMode:kCGBlendModeNormal alpha:0.5];
 [self.doubleFrameViewcapturedImg2.image drawInRect:CGRectMake(0,0,size.width,size.height) blendMode:kCGBlendModeNormal alpha:0.5];
  }
 CGContextRef context=UIGraphicsGetCurrentContext();
 [self.previewView.layer renderInContext:context];
 UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();
 NSArray *activity=[[NSArray alloc]initWithObjects:UIActivityTypeCopyToPasteboard,
                   UIActivityTypeMail,
                   UIActivityTypeMessage,
                   UIActivityTypePostToFacebook,
                   UIActivityTypePostToTwitter,
                   UIActivityTypeSaveToCameraRoll,
                   UIActivityTypeAirDrop
                   , nil];
 UIActivityViewController *ShareView=[[UIActivityViewController alloc]initWithActivityItems:@[newImage,activity] applicationActivities:nil];
 ShareView.popoverPresentationController.sourceView=self.view;
 [self presentViewController:ShareView animated:YES completion:nil];

Answer 1

您可以使用CoreGraphics执行此操作，有关详细信息，请按照CodeTutePlus AdvancedImageTechnicsCoreGraphics

的教程进行操作