有什么办法可以在Swift中得到断言吗？

问题描述

Swift似乎没有C＃/ Java类的异常，而是使用断言。但是，这本书说，在生产环境中，他们立即崩溃了应用程序。没有办法吗？单元测试怎么样，如何测试某个函数声明它获得正确的输入值？

It seems that Swift doesn't have C#/Java-like exceptions and uses assertions instead. However, the book says that in production environment, they instantly crash the app. Isn't there a way around it? What about unit tests, how can I test that a certain function asserts that it gets a correct input value?

推荐答案

从Apple书，Swift编程语言似乎应该使用枚举来处理错误。

From Apple books, The Swift Programming Language it's seems erros should be handle using enum.

这是本书的一个例子。

enum ServerResponse {
    case Result(String, String)
    case Error(String)
}

let success = ServerResponse.Result("6:00 am", "8:09 pm")
let failure = ServerResponse.Error("Out of cheese.")

switch success {
case let .Result(sunrise, sunset):
    let serverResponse = "Sunrise is at \(sunrise) and sunset is at \(sunset)."
case let .Error(error):
    let serverResponse = "Failure...  \(error)"
}

来自：Apple Inc.Swift编程语言iBooks。

From: Apple Inc. "The Swift Programming Language." iBooks. https://itun.es/br/jEUH0.l

对于意外的错误，您应该使用NSException作为

For unexpected erros you should use NSException as point out by lfalin

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