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In Objective-C, you can make a mark like that in two different ways:

在Objective-C中，你可以用兩種不同的方式做這樣的標記:

#pragma mark - Hack

// MARK: HACK

This will appear like so:

這看起來是這樣的:

In Swift, you only get // MARK, which is treated like a pragma mark.

在Swift中，您只能得到//標記，這被視為實用標記。

// MARK: Something

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If you're in Objective-C, use this syntax:

如果你在Objective-C中，使用以下語法:

#pragma mark Line In Sand

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It turns out that the pre-processor in Swift makes special allowance for the

事實證明，Swift的預處理器會為其提供特殊的補貼。

// MARK: 

syntax, while the Objective C pre-processor sees this and makes no allowance for special handling. This could be alleviated by Apple by omitting the "MARK:" from the menu just as is done with the #pragma version but no joy.

語法，而Objective C預處理器看到了這一點，不考慮特殊處理。蘋果可以通過從菜單中刪除“MARK:”來緩解這一問題，就像#pragma版本的菜單一樣，但是沒有樂趣。

And on a related note, it turns out the Swift (not ObjC) pre-processor also knows how to add a divider line in automatically so:

與此相關的是，Swift(不是ObjC)預處理器也知道如何自動添加分隔線:

// MARK: - Line In Sand

produces not only a divider line but the 'markless' menu item as well... but only in Swift.

不僅生成分隔行，還生成“無標記”菜單項……但是只有在斯威夫特。

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Fixed in Xcode 8. Now both Swift and ObjC parsing of comments produce equally pleasing results :

固定在Xcode中8。現在，對評論的快速解析和ObjC解析都會產生同樣令人愉快的結果:

// MARK: - Line in Sand

//馬克:-沙子里的線

Suppresses the "MARK" and you only get the divider and the "Line in Sand"

壓制“標記”，你只能得到分隔符和“沙線”

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In Xcode 8.3, Apple finally fixed // MARK: convention for marking sections of code in Objective C so it no longer showed the word "MARK" in the menu.

在Xcode 8.3中，蘋果最終確定了//標記:在Objective C中標記代碼段的約定，因此在菜單中不再顯示單詞“MARK”。

The Objective C #pragma mark - was inconsistent with other code marking mechanisms such as // ???: , // !!!: , // FIXME: , and others. The fact that // MARK: was implemented cleanly in Swift and half-implemented in ObjC was inconsistent in Xcode itself until Xcode fixed the implementation for // MARK: in the editor for ObjC.

目標c# pragma mark—與其他代碼標記機制(如/ ?)不一致。:/ / ! ! !:， //修理我和其他人。在Swift中實現了// MARK:，在ObjC中實現了一半，這一事實在Xcode本身中是不一致的，直到Xcode在ObjC的編輯器中修復了// / MARK:的實現。

With Xcode 8.3

在Xcode 8.3

// MARK: - Line In Sand

works in Objective C properly and no longer shows the "MARK" artifact in the menu.

正確使用Objective - C，不再顯示菜單中的“標記”工件。