IPhone apps save images to album instances

IPhoneThe application willImageSaveAlbumThe instance is the content to be introduced in this article. It mainly uses code to implement the content to be presented in this article and enter the topic. Sometimes your application needsImageSave to userIPhoneOr iTouchAlbum. You can use this class method of UIKit.

 
 

  
  
void UIImageWriteToSavedPhotosAlbum (    
  
  
   UIImage  *image,    
  
  
   id       completionTarget,    
  
  
   SEL      completionSelector,    
  
  
   void     *contextInfo    
  
  
);    
  
  
void UIImageWriteToSavedPhotosAlbum (  
  
  
   UIImage  *image,  
  
  
   id       completionTarget,  
  
  
   SEL      completionSelector,  
  
  
   void     *contextInfo  
  
  
);  
 
 

Image

To save to a user DeviceImage

CompletionTarget

After the callback method is saved

CompletionSelector

The callback method called after the data is saved. The format is as follows:

 
 

  
  
- ( void ) image: ( UIImage *) image  
  
  
    didFinishSavingWithError: ( NSError *) error  
  
  
    contextInfo: ( void *) contextInfo; 
 
 

ContextInfo

The optional parameter stores a pointer to the context data, which is passed to the callback method.

For example, you can write a method to store photos as follows:

 
 

  
  
// The image to save
  
  
UIImage * img = [UIImage imageNamed: @ "ImageName.png"];
  
  

  
  
// Save the image to the album
  
  
UIImageWriteToSavedPhotosAlbum (img, self, @ selector (image: didFinishSavingWithError: contextInfo :), nil );
 
 

The callback method may look like this:

 
 

  
  
(void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error    
  
  
             contextInfo:(void *)contextInfo    
  
  
  {    
  
  
    // Was there an error?     
  
  
    if (error != NULL)    
  
  
    {    
  
  
      // Show error message…     
  
  
     
  
  
    }    
  
  
    else  // No errors     
  
  
    {    
  
  
      // Show message image successfully saved     
  
  
    }    
  
  
  }    
  
  
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error  
  
  
             contextInfo:(void *)contextInfo  
  
  
  {  
  
  
    // Was there an error?  
  
  
    if (error != NULL)  
  
  
    {  
  
  
      // Show error message…  
  
  
   
  
  
    }  
  
  
    else  // No errors  
  
  
    {  
  
  
      // Show message image successfully saved  
  
  
    }  
  
  
  }  
 
 

Save the current view:

 
 

  
  
# Import <QuartzCore/QuartzCore. h>
  
  
 
  
  
UIGraphicsBeginImageContext (currentView. bounds. size); // currentView current view
  
  
 
  
  
[CurrentView. layer renderInContext: UIGraphicsGetCurrentContext ()];
  
  
 
  
  
UIImage * viewImage = UIGraphicsGetImageFromCurrentImageContext ();
  
  
 
  
  
UIGraphicsEndImageContext ();
  
  
 
  
  
UIImageWriteToSavedPhotosAlbum (viewImage, nil );
 
 

Summary:IPhoneThe application willImageSaveAlbumI hope this article will help you with the introduction of the instance!