iOS压缩图片

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

// 压缩图片

- ( 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;

}