Xcode 8 警告“实例方法几乎匹配可选要求" [英] Xcode 8 Warning "Instance method nearly matches optional requirement"

问题描述

我在 Xcode 8 中将我的 (macOS) 项目转换为 Swift 3，并且我在 swift 类中实现的几个委托方法收到以下警告:

I converted my (macOS) project to Swift 3 in Xcode 8 and I get the following warnings with several delegate methods I implement in swift classes:

Instance method 'someMethod' nearly matches optional requirement of protocol 'protocolName'

我在几个 NSApplicationDelegate 方法中得到了这个，比如 applicationDidFinishLaunching 和 applicationDidBecomeActive:

I get this for several NSApplicationDelegate methods like applicationDidFinishLaunching and applicationDidBecomeActive:

但也适用于 tableViewSelectionDidChange 的实现:

But also for implementations of tableViewSelectionDidChange:

我使用代码完成来插入方法签名，并尝试从 SDK 头文件中复制它们以排除拼写错误.警告不会消失，方法也不会被调用.

I used code completion to insert the method signatures and also tried copying them from the SDK-headers to rule out typos. The warnings just don't disappear and the methods are never called.

我在这里遗漏了什么?

推荐答案

我们就此问题联系了 Apple 开发人员技术支持 (DTS).他们回答说这是 Xcode 8 中的一个错误.

We contacted Apple Developer Technical Support (DTS) with this issue. They replied that this is a bug in Xcode 8.

我们提交了错误报告，希望能快速更新.(Apple 错误报告 ID:28315920).

We submitted a bug report and hope for a quick update. (Apple Bug Report ID: 28315920).

如果您遇到类似问题，也请提交错误报告(指的是我们的)所以苹果工程师看到的不是一个案例.

If you experience a similar issue, please also file a bug report (referring to ours) so the Apple engineers see its not a single case.

Xcode ≥ 8.1 的更新

问题现在似乎已解决，至少对于我们在项目中使用的委托方法而言是这样.

The problem seems fixed now, at least for the delegate methods we are using in our project.

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