UIImage 压缩

1.改变图片大小

  

   

    

     

    
    

     

      -(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
    // Create a graphics image context
     
    
   

    

     

    
    

     
    UIGraphicsBeginImageContext(newSize);
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    // Tell the old image to draw in this new context, with the desired
     
    
   

    

     

    
    

     
    // new size
     
    
   

    

     

    
    

     

          [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    // Get the new image from the context
     
    
   

    

     

    
    

     

          UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    // End the context
     
    
   

    

     

    
    

     
    UIGraphicsEndImageContext();
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     
    // Return the new image.
     
    
   

    

     

    
    

     
    return newImage;
     
    
   

    

     

    
    

     

      }
     
    
  
 

  
 
 

2.改变图片质量

NSData *imageData = UIImageJPEGRepresentation(imageNew, 0.0001);

code

 UIImage *imageNew;

    imageNew = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

    imageNew = [self imageWithImage:imageNew scaledToSize:CGSizeMake(100, 100)];

    NSData *imageData = UIImageJPEGRepresentation(imageNew, 0.0001);

    m_selectImage = [UIImage imageWithData:imageData];

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/8668528