MonoTouch-访问Obj-C常量 [英] MonoTouch - access to Obj-C Constants

问题描述

很多时候，我会阅读Obj-C代码，并需要其中一个常量的值出现在其中一个Obj-C头文件中。

Many times I'll read Obj-C code and need the value to one of their constants present in one of the Obj-C header files.

用于通知，我已经能够在MonoTouch中找到它们，例如 UIApplication.DidEnterBackgroundNotification 。

For notifications, I've been able to find them in MonoTouch such as UIApplication.DidEnterBackgroundNotification.

是否存在标准方法获得这样的价值？由于某种奇怪的原因，我需要查找 UINavigationControllerHideShowBarDuration 。

Is there a standard way to get such values? I am needing to lookup UINavigationControllerHideShowBarDuration for an odd reason.

推荐答案

< a href = http://developer.apple.com/library/ios/#documentation/uikit/reference/UINavigationController_Class/Reference/Reference.html rel = nofollow> UINavigationControllerHideShowBarDuration 是 CGFloat ，MonoTouch映射到.NET System.Single （ float （在C＃中）。

UINavigationControllerHideShowBarDuration is a CGFloat, which MonoTouch maps to a .NET System.Single (float in C#).

您应该可以使用 MonoTouch.ObjCRuntime.Dlfcn.GetFloat 方法，以获取 constant 值（它可以在版本之间进行更改，不应像C＃ const 那样嵌入）运行。例如，

You should be able to use MonoTouch.ObjCRuntime.Dlfcn.GetFloat method to retrieve the constant (it could change between versions and should not be embedded like a C# const) value at runtime. E.g.

IntPtr handle = Dlfcn.dlopen (Constants.UIKitLibrary, 0);
return Dlfcn.GetFloat (handle, "UINavigationControllerHideShowBarDuration");

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