如何制作垂直的 UIToolbar？

如何制作垂直的 UIToolbar？

子类化 UIToolbar 并执行以下操作：

CGFloat DegreesToRadian(CGFloat degrees)
{
    return ((M_PI * (degrees))/ 180.0);
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) 
    {
        self.transform = CGAffineTransformMakeRotation(DegreesToRadian(90));
    }
    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    for (UIView * subView in self.subviews) 
    {
        if(!CGRectEqualToRect(subView.bounds, self.bounds))
            subView.transform = CGAffineTransformMakeRotation(DegreesToRadian(-90));
    }
}