UISegmentedControl：在 UIToolbar 中使用时不会触发任何事件
Monotouch 4.2 测试版。
我正在将 UISegmentedControl 添加到 UIToolbar。 问题是切换段时不会触发任何事件。我在这里缺少什么？
this.oBookmarkSwitch = new UISegmentedControl(new UIImage[] { UIImage.FromFile("./images/index.png"), UIImage.FromFile("./images/bookmark_grey.png") });
this.oBookmarkSwitch.TouchUpInside += delegate {
Console.WriteLine("TOUCHY - never fires");
};
this.oBookmarkSwitch.ValueChanged += delegate {
Console.WriteLine("CHANGE - only fires once when the control is created");
};
this.oBookmarkSwitch.Frame = new RectangleF(0, 0, 100, 30);
this.oBookmarkSwitch.ControlStyle = UISegmentedControlStyle.Bar;
aBarButtons.Add(new UIBarButtonItem(this.oBookmarkSwitch));
oIndexToolbar.SetItems (aBarButtons.ToArray (), false);
Monotouch 4.2 beta.
I'm adding a UISegmentedControl to a UIToolbar.
The problem is that none of the events fire when switching segments. What am I missing here?
this.oBookmarkSwitch = new UISegmentedControl(new UIImage[] { UIImage.FromFile("./images/index.png"), UIImage.FromFile("./images/bookmark_grey.png") });
this.oBookmarkSwitch.TouchUpInside += delegate {
Console.WriteLine("TOUCHY - never fires");
};
this.oBookmarkSwitch.ValueChanged += delegate {
Console.WriteLine("CHANGE - only fires once when the control is created");
};
this.oBookmarkSwitch.Frame = new RectangleF(0, 0, 100, 30);
this.oBookmarkSwitch.ControlStyle = UISegmentedControlStyle.Bar;
aBarButtons.Add(new UIBarButtonItem(this.oBookmarkSwitch));
oIndexToolbar.SetItems (aBarButtons.ToArray (), false);
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Apple 文档对此不是很清楚，但它指出：
“您注册使用分段控件的目标操作方法
UIControlEventValueChanged 常量如下所示。”（强调我的）
还有 Apple 的讨论< /a> 和 stackoverflow 论坛似乎表明只有 ValueChange 事件是支持 - 这将与运行时行为相匹配，即 UISegmentedControl 事件没有 MonoTouch 特定代码（例如，删除对 TouchUpInside 等继承事件的支持）。
Apple documentation is not very clear on this but it state that:
"You register the target-action methods for a segmented control using the
UIControlEventValueChanged constant as shown below." (emphasis mine)
Also discussions from Apple and stackoverflow forums seems to indicate that only the ValueChange event is supported - which would match the runtime behavior. I.e. there's no MonoTouch specific code for the UISegmentedControl events (e.g. to remove support for inherited events like TouchUpInside).