UINavigationBar - 如何更改 UIBarButtonItem 的位置？

Question

我已经对 UINavigationBar 进行了子类化。 NavigationBar 有两个 UIBarButtonItem 类型的按钮。可以移动这些按钮吗？例如，我想将“左按钮”向右移动50px，将“右按钮”向左移动50px。

LayoutSubViews 是移动这些按钮的正确位置吗？

这是 NavigationBar 类（在 MT 中创建）：

[MonoTouch.Foundation.Register("NavigationBar")]
public class NavigationBar : UINavigationBar
{
    public NavigationBar (IntPtr handle) : base (handle)
    {
        Initialize ();
    }

    [Export ("initWithCoder:")]
    public NavigationBar (NSCoder coder) : base (coder)
    {
        Initialize ();
    }

    public NavigationBar(RectangleF frame, string title) : base (frame)
    {
        InitializeWithStyleAndTitle(title);
    }   

    void Initialize() { }

    void InitializeWithStyleAndTitle(string title)
    {
        //- title
        UINavigationItem navItem = new UINavigationItem(title);

        //- left button
        UIBarButtonItem leftBarButtonItem = new UIBarButtonItem("back", UIBarButtonItemStyle.Plain, this, new Selector("backAction"));
        navItem.LeftBarButtonItem = leftBarButtonItem;

        //- right button
        UIBarButtonItem rightBarButtonItem = new UIBarButtonItem("update", UIBarButtonItemStyle.Plain, this, new Selector("updateAction"));
        navItem.RightBarButtonItem = rightBarButtonItem;    

        //- style 
        BarStyle = UIBarStyle.Black;

        PushNavigationItem(navItem, false);
    }

    //- selectors omitted
}

Answer 1

不，UINavigation 有特定的行为，只有左右按钮。如果您需要定位按钮，则应该使用 UIToolbar。在它们之间添加垫片以调整按钮的位置。

Answer 2

我正在设置自定义按钮的框架并将按钮放置在视图中

CustomButton *menu = [[CustomButton alloc] initWithFrame:CGRectMake(7, 3, 35, 35)];
[menu setImage:[UIImage imageNamed:@"sliding_drawer_white_icons"] forState:UIControlStateNormal];
UIView * menuButtonView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 46.0f, 40.0f)];
[menuButtonView addSubview:menu];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:menuButtonView];