add the following method
-(UIImage *)imageResize :(UIImage*)img andResizeTo:(CGSize)newSize
{
CGFloat scale = [[UIScreen mainScreen]scale];
//UIGraphicsBeginImageContext(newSize);
UIGraphicsBeginImageContextWithOptions(newSize, NO, scale);
[img drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
now change your code as
[separatorLineView setFrame:CGRectMake(10, 0, 180, 3)];
separatorLineView.backgroundColor = [UIColor colorWithPatternImage:[self imageResize :[UIImage imageNamed:@"divider.png"] andResizeTo:separatorLineView.frame.size]];