案头见蠹鱼，犹胜凡俦侣。这篇文章主要讲述如何在MonoTouch中为继承的视图创建UIAppearance代理？相关的知识，希望能为你提供帮助。
我创建了一个UIButton的子类，它充当UIBarButtonItem中的自定义Back按钮：
- - - - - - - - - - - - - - - - -
|UIBarButtonItem||------------------------|
/|
|BackButton : UIButton ||
------------------------
|___________|
当我将我的代码切换到使用
UIAppearance时，我注意到BackButton.Appearance是毫无疑问的，继承自UIButton.Appearance，因此更改它将改变整个应用程序中的所有UIButtons，而不仅仅是我的自定义按钮。我知道我可以使用
AppearanceWhenContainedIn但是，因为UIBarButtonItem不是外观容器，我必须在它们之间插入另一个视图以识别后退按钮，我不想这样做。如何为我的自定义
UIAppearance子类提供UIButton代理，该子类具有UIButton.UIButtonAppearance中的所有可用方法？我注意到它的构造函数是内部的。答案虽然可能有一个更简单的答案，但我最终直接从
UIAppearance继承并从MonoDevelop C＃反汇编程序中复制粘贴相关的UIButton和UIButton+UIButtonAppearance绑定实现，并在此处和那里修复内部字段。在
BackButton内：static readonly IntPtr class_ptr = Class.GetHandle(typeof(BackButton));
public new static BackButtonAppearance Appearance
{
get {
return new BackButtonAppearance (Messaging.IntPtr_objc_msgSend (class_ptr, UIAppearance.SelectorAppearance));
}
}public new static BackButtonAppearance AppearanceWhenContainedIn (params Type[] containers)
{
return new BackButtonAppearance (UIAppearance.GetAppearance (class_ptr, containers));
}
嵌套的
BackButtonAppearance：public class BackButtonAppearance : UIAppearance {
public BackButtonAppearance(IntPtr handle) : base(handle) { }// These are copied from UIButton disassembly:static readonly IntPtr selSetBackgroundImageForState_ = Selector.GetHandle ("setBackgroundImage:forState:");
static readonly IntPtr selSetTitleShadowColorForState_ = Selector.GetHandle ("setTitleShadowColor:forState:");
static readonly IntPtr selSetTitleColorForState_ = Selector.GetHandle ("setTitleColor:forState:");
// These are copied from UIButton+UIButtonAppearance disassembly,
// with internal UIButton.selSet* fields replaced by fields declared above.[Export ("setBackgroundImage:forState:"), CompilerGenerated]
public virtual void SetBackgroundImage (UIImage image, UIControlState forState)
{
UIApplication.EnsureUIThread ();
if (this.IsDirectBinding) {
Messaging.void_objc_msgSend_IntPtr_UInt32 (base.Handle, selSetBackgroundImageForState_, (image != null) ? image.Handle : IntPtr.Zero, (uint)forState);
} else {
Messaging.void_objc_msgSendSuper_IntPtr_UInt32 (base.SuperHandle, selSetBackgroundImageForState_, (image != null) ? image.Handle : IntPtr.Zero, (uint)forState);
}
}[Export ("setTitleColor:forState:"), CompilerGenerated]
public virtual void SetTitleColor (UIColor color, UIControlState forState)
{
UIApplication.EnsureUIThread ();
if (this.IsDirectBinding) {
Messaging.void_objc_msgSend_IntPtr_UInt32 (base.Handle, selSetTitleColorForState_, (color != null) ? color.Handle : IntPtr.Zero, (uint)forState);
} else {
Messaging.void_objc_msgSendSuper_IntPtr_UInt32 (base.SuperHandle, selSetTitleColorForState_, (color != null) ? color.Handle : IntPtr.Zero, (uint)forState);
}
}[Export ("setTitleShadowColor:forState:"), CompilerGenerated]
public virtual void SetTitleShadowColor (UIColor color, UIControlState forState)
{
UIApplication.EnsureUIThread ();
if (this.IsDirectBinding) {
Messaging.void_objc_msgSend_IntPtr_UInt32 (base.Handle, selSetTitleShadowColorForState_, (color != null) ? color.Handle : IntPtr.Zero, (uint)forState);
} else {
Messaging.void_objc_msgSendSuper_IntPtr_UInt32 (base.SuperHandle, selSetTitleShadowColorForState_, (color != null) ? color.Handle : IntPtr.Zero, (uint)forState);
}
}
}
这允许我带来我的自定义视图以支持UIAppearance风格的API。
另一答案为完整性添加答案。
【如何在MonoTouch中为继承的视图创建UIAppearance代理（）】使用
BackButton.GetAppearance<
BackButton>
()而不是BackButton.Appearance。推荐阅读
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