Question

所以我最近决定加入iOS开发，主要是因为我喜欢在多个平台上扩展我的知识，而且我已经知道java并编写了一个Android应用程序，iOS是下一步。

所以我的问题是：在一个表中，我使用自定义tablesource来响应行上的点击并加载新视图。现在在该视图中，我想添加一个后退按钮以返回上一个视图。

   PointF locationOne = new PointF (5, 5);
    PointF locationTwo = new PointF (5, 100);
    SizeF size = new SizeF (120, 40);

    RectangleF tView = new RectangleF (locationOne, size);
    RectangleF tView2 = new RectangleF (locationTwo, size);
        UILabel l1 = new UILabel(){Text = "LOOL",Frame=tView};

        UIButton backbutton = new UIButton(){
            Frame=tView2
        };
        backbutton.Frame = tView2;
        backbutton.TitleLabel.Text = "Zurueck";
        backbutton.Hidden = false;

        UIView previousview = viewController.View;
        backbutton.TouchDown += (sender, e) => { 
            viewController.View = previousview;
        };

        UIView v = new UIView();
        v.AddSubview(l1);
        v.AddSubview (backbutton);


        viewController.View = v;

这将是我现在的代码。正在显示标签，按钮不是。有什么我想念的吗？

非常感谢：）

Answer 1

UIView v没有框架。您需要将其设置为父控制器的框架（可能是v.Frame = viewController.View.Frame;）。然后，换出viewcontroller的视图。

编辑：

UIButton的初始化是不对的。以下是创建常规按钮的方法：

PointF locationOne = new PointF (5, 5);
PointF locationTwo = new PointF (5, 100);
SizeF size = new SizeF (120, 40);

RectangleF tView = new RectangleF (locationOne, size);
RectangleF tView2 = new RectangleF (locationTwo, size);
UILabel l1 = new UILabel (){Text = "LOOL",Frame=tView};

UIButton backbutton = UIButton.FromType(UIButtonType.RoundedRect);
backbutton.Frame = tView2;
backbutton.SetTitle("Zurueck", UIControlState.Normal);

UIView previousview = viewController.View;
backbutton.TouchUpInside += (sender, e) => { 
    viewController.View = previousview;
};

UIView v = new UIView ();
v.BackgroundColor = UIColor.White;
v.AddSubview (l1);
v.AddSubview (backbutton);
viewController.View = v;

MonoTouch：按钮不可见

1 个答案: