[英]How to warn caller of a func in Swift
I am refactoring a large iOS Swift
project gradually.我正在逐步重构一个大型
iOS Swift
项目。 Some function have to be renamed and I cannot rename directly because many other modules directly calling it.一些 function 必须重命名,我不能直接重命名,因为许多其他模块直接调用它。 Instead, for the first phase release, I want to let the caller of a function know that please use this func instead of this func.
相反,对于第一阶段的发布,我想让 function 的调用者知道请使用这个函数而不是这个函数。 Let me explain with an example,
让我用一个例子来解释,
func length() - > Int {
//..... some logic
}
Expecting to refactor it in next version to,期待在下一个版本中将其重构为,
func count() - > Int {
//..... same logic
}
For the 1st phase I want to keep both length()
and count()
but let other developers be warned not to use existing one, ie length().对于第一阶段,我想同时保留
length()
和count()
,但要警告其他开发人员不要使用现有的,即 length()。 So I tried with,所以我尝试了,
func length() - > Int {
#warning("Please use count() instead")
//..... some logic
}
But the warning is thrown in the line but not to the caller.但是警告被抛出,而不是给调用者。 So, what are the best way to let caller be informed about wrong call?
那么,让来电者知道错误来电的最佳方法是什么?
Note: The example here is just a simplest form to understand the problem.注意:这里的示例只是理解问题的最简单形式。 Actual implementation is much broader in scope and module size.
scope 和模块尺寸的实际实现要广泛得多。
You can manage the availability of a method with @available
keyword.您可以使用
@available
关键字管理方法的可用性。
To warn the user:警告用户:
@available(*, deprecated, message: "Please use count() instead")
func length() - > Int { }
To force the user:强制用户:
@available(*, unavailable, message: "Please use count() instead")
func length() - > Int { }
To suggest the user to rename the function:建议用户重命名 function:
@available(*, renamed: "count()")
func length() - > Int { }
Also you can set the platform and the deprecation version if you need to (even without a message):如果需要,您还可以设置平台和弃用版本(即使没有消息):
@available(iOS, deprecated:11.2)
func length() - > Int { }
Use the available
keyword使用
available
的关键字
You can use it in a couple of ways, if you want to show a warning to the developer then you should use deprecated
, however if you want to force them then use unavailable
您可以通过多种方式使用它,如果您想向开发人员显示警告,那么您应该使用
deprecated
,但是如果您想强制它们,则使用unavailable
@available(*, deprecated, message: "Please use count() instead")
func length() - > Int {
}
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