修改UIAlertView背景

UIGraphicsBeginImageContext(theSize);    
    [theImage drawInRect:CGRectMake(0, 0, theSize.width, theSize.height)];    
    theImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    theAlert.layer.contents = (id)[theImage CGImage];

 

 

 

  UIImageView * image = [theAlert valueForKey:@"_backgroundImageView"];
    image.image = [UIImage imageNamed:@"loveChina.png"];