以编程方式在ARKit中自定义uibutton

我正在玩arkitapi…我想在右边的框中添加自定义ui按钮,该框显示在由下面的代码在app delegate中生成的屏幕上:

#define BOX_WIDTH 350
#define BOX_HEIGHT 150

- (UIView *)viewForCoordinate:(ARCoordinate *)coordinate {

    CGRect theFrame = CGRectMake(0, 0, BOX_WIDTH, BOX_HEIGHT);
    UIView *tempView = [[UIView alloc] initWithFrame:theFrame];

    //tempView.backgroundColor = [UIColor colorWithWhite:.5 alpha:.3];

    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, BOX_WIDTH, 20.0)];
    titleLabel.backgroundColor = [UIColor colorWithWhite:.3 alpha:.8];
    titleLabel.textColor = [UIColor whiteColor];
    titleLabel.textAlignment = UITextAlignmentCenter;
    titleLabel.text = coordinate.title;
    [titleLabel sizeToFit];

    titleLabel.frame = CGRectMake(BOX_WIDTH / 2.0 - titleLabel.frame.size.width / 2.0 - 4.0, 0, titleLabel.frame.size.width + 8.0, titleLabel.frame.size.height + 8.0);

    UIImageView *pointView = [[UIImageView alloc] initWithFrame:CGRectZero];
    pointView.image = [UIImage imageNamed:@"location.png"];
    pointView.frame = CGRectMake((int)(BOX_WIDTH / 2.0 - pointView.image.size.width / 2.0), (int)(BOX_HEIGHT / 2.0 - pointView.image.size.height / 2.0), pointView.image.size.width, pointView.image.size.height);

    [tempView addSubview:titleLabel];
    [tempView addSubview:pointView];

    [titleLabel release];
    [pointView release];

    return [tempView autorelease];
}

我怎样才能成功?请帮帮我!