图片压缩

imageCompress.m

// 用法：UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
      
      // Create a graphics image context
      
      UIGraphicsBeginImageContext(newSize);
      
      // Tell the old image to draw in this newcontext, 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;
}