所以，我对之前类似问题的回答是学习Objective-C。(另外，不要忘记调试支持)

This will probably offend some but to be honest, if you are going to do any serious development, you should learn Objective-C. Not knowing Objective-C in iPhone development will just be a hindrance. You won't be able to understand many examples; you have to deal with the quirks of Mono whereas if you had a working knowledge of Objective-C you could get a lot more out of the platform documentation. Personally, I don't understand the position that says increasing the amount of information you need in favor of using Mono over the platform's native language. It seems somewhat counterproductive to me. I think if this is a very expensive proposition (learning a new language) then it may be worthwhile spending some time on fundamental programming concepts so that learning new languages is a fairly cheap proposition.

另一位用户也这样写道:

现在单触摸对你来说更容易了。但之后就更难了。

例如，当新的种子出现时，你需要测试，但由于某种原因破坏了MonoTouch，会发生什么?

通过坚持使用Mono，任何时候你在寻找框架的资源时，你都必须在心里转换成你将如何在Mono中使用它们。你的应用二进制文件会更大，在使用Objective-C几个月后，你的开发时间不会更快，而其他应用开发者会比你更有优势，因为他们使用的是原生平台。

另一个需要考虑的问题是，您希望使用c#，因为您对该语言比Objective-C更熟悉。但是iPhone学习曲线的绝大部分并不是Objective-C，而是框架——你也必须调用c#。

对于任何平台，你都应该使用直接表达该平台设计理念的平台——在iPhone上，那就是Objective-C。从相反的角度考虑这个问题，如果一个习惯用GTK编程的Linux开发人员想要编写Windows应用程序，你会认真地建议他们不要使用c#而坚持使用GTK，因为这样做对他们来说“更容易”吗?

我换了。Monotouch让我编写应用程序的速度至少提高了3-4倍(与我以前在Obj C中每月1个应用程序相比，每月4个)

打字少了很多。

只是我的经验。

如果这是你唯一要开发的iPhone应用程序，而你对开发Mac应用程序毫无兴趣，那么MonoTouch可能是值得的。

如果你想要开发更多的iPhone应用，或者想要做一些Mac原生开发，那么学习Objective-C和相关框架可能是值得的。另外，如果你是那种喜欢学习新东西的程序员，这是一个有趣的新范式。

我已经使用MonoTouch几个月了，我从ObjectiveC移植了我的半成品应用，这样我就可以在未来的某个时候支持Android。

以下是我的经验:

不好的地方在于:

Xamarin Studio. Indie developers such as myself are forced into using Xamarin Studio. It is getting better every week, the developers are very active on the forums identifying and fixing bugs, but it's still very slow, frequently hangs, has a lot of bugs and debugging is pretty slow also. Build times. Building my large (linked) app to debug on a device can take a few minutes, this is compared to XCode which deploys almost immediately. Building for the simulator (non-linked) is a bit quicker. MonoTouch issues. I've experienced memory leak issues caused by the event handling, and have had to put in some pretty ugly workarounds to prevent the leaks, such as attaching and detaching events when entering and leaving views. The Xamarin developers are actively looking into issues like this. 3rd party libraries. I've spent quite a time converting/binding ObjectiveC libraries to use in my app, although this is getting better with automated software such as Objective Sharpie. Larger binaries. This doesn't really bother me but thought I'd mention it. IMO a couple of extra Mb is nothing these days.

好的方面:

多平台。我的朋友很高兴地用我的核心代码库为我的应用程序创建了一个Android版本，我们正在并行开发，并将其提交给Dropbox上的远程Git存储库，进展顺利。 . net。在c# . net中工作比在Objective C中工作要好得多。 MonoTouch。iOS中几乎所有的东西都映射到。net中，让事情正常工作是相当直接的。 Xamarin的。你可以看到这些人真的在努力改进一切，使开发更顺畅和更容易。

我强烈推荐Xamarin进行跨平台开发，特别是如果你有钱使用与Visual Studio合作的商业版或企业版。

如果你只是在创造一款在其他平台上永远都不需要的iPhone应用，并且你是一名独立开发者，那么我现在会坚持使用XCode和Objective C。

MonoTouch库的成本完全不是重点。你不应该在你的iPhone应用中使用Mono的原因是，它是一种拐杖。如果您懒得学习本机工具，那么我就没有理由相信您的产品值得下载。

编辑:4/14/2010用MonoTouch编写的应用程序不适合iTunes Store。这是应该的。苹果在Mac上看到了大量的浅端口，使用跨平台工具包，如Qt，或Adobe自己的System 7工具箱的部分重新实现，总之，它们不够好。

作为一个同时拥有c#和Objective-C经验的人，我想说对于大多数人来说Xamarin是物有所值的。

c#是一门设计得很好的语言，c# API也是设计得很好的。当然Cocoa Touch的API(包括UIKit)也有很好的设计，但是语言可以在几个方面得到改进。当你用c#写代码时，你可能会比用Objective-C写相同的代码更有效率。这是由于几个原因，但其中一些原因是:

C# has type inference. Type inference makes writing code quicker, since you don't have to "know" the type on the left-hand side of an assignment. It also makes refactoring easier and more saver. C# has generics, which will reduce errors compared to equivalent Objective-C code (though there are some work-arounds in Objective-C, in most situations developers will avoid them). Recently Xamarin added support for Async / Await, which makes writing asynchronous code very easy. You'll be able to reuse part of the code base on iOS, Android and Windows Phone. MonoTouch largely implements the CocoaTouch API's in a very straightforward way. E.g.: if you've got experience with CocoaTouch, you'll know where to find classes for controls in MonoTouch (MonoTouch.UIKit contains classes for UIButton, UIView, UINavigationController, etc..., likewise MonoTouch.Foundation got classes for NSString, NSData, etc...). Xamarin will give users a native experience, unlike solutions like PhoneGap or Titanium.

现在Objective-C比c#有一些优势，但在大多数情况下，用c#编写应用程序通常会减少开发时间和更清晰的代码，并减少将同一应用程序移植到其他平台的工作。一个值得注意的例外可能是依赖OpenGL的高性能游戏。