能够採用例如以下方法，写一个函数：

-(UIImage*) getOneImageButtonWithArrow{

    //tmpView做附控件

    UIView *tmpView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 38.0f, 32.0f)];

	tmpView.backgroundColor = [UIColor clearColor];

    //bgImg作为背景

    UIImage* bgImg = [UIImage imageNamed:@"background.png"];

    UIImageView *bgImageView = [[UIImageView alloc] initWithImage:bgImg];

	bgImageView.frame = tmpView.frame;

    //增加tmpView

	[tmpView addSubview:bgImageView];

	[bgImageView release];

    //里面的icon

    UIImageView *tmpImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"icon.png"]];

    tmpImageView.frame = CGRectMake(4.0f, 4.0f, 24.0f, 24.0f);

	tmpImageView.backgroundColor = [UIColor clearColor];

	tmpImageView.alpha = 1.0f;

	[tmpView addSubview:tmpImageView];

    //箭头

    UIImage *arrowImage = [UIImage imageNamed:@"arrow.png"];

    UIImageView *arrowImageView = [[UIImageView alloc] initWithImage:arrowImage];

	arrowImageView.frame = CGRectMake(28.0f, 4.0f, 6.0f, 24.0f);

	[tmpView addSubview:arrowImageView];

    //获取上下文。得到这个UIImage

    UIGraphicsBeginImageContextWithOptions(tmpView.bounds.size, NO, 0.0);

    [tmpView.layer renderInContext:UIGraphicsGetCurrentContext()];

	UIImage *tmpImage = UIGraphicsGetImageFromCurrentImageContext();

	UIGraphicsEndImageContext();

	return tmpImage;

}