警告：不推荐使用'characters'：请直接使用String或Substring [英] warning: 'characters' is deprecated: Please use String or Substring directly

问题描述

我使用属性字符执行/处理了很多字符串操作。

任何人对此次更新都有任何想法/信息？

解决方案

Swift 4引入了对字符串API的更改。

你可以使用！stringValue.isEmpty 而不是 stringValue.characters.count> 0

有关更多信息，请从这里

例如

  let edit =Summary
 edit.count // 7 
  

characters - an instance property of String, is deprecated from with Xcode 9.1

It was very useful to get a substring from String by using the characters property but now it has been deprecated and Xcode suggests to use substring. I've tried to check around SO questions and apple developer tutorials/guidelines for the same. But could not see any solution/alternate as suggested.

Here is warning message:

'characters' is deprecated: Please use String or Substring

I've so many string operations are performed/handled using property characters.

Anyone have any idea/info about this update?

解决方案

Swift 4 introduced changes on string API.
You can just use !stringValue.isEmpty instead of stringValue.characters.count > 0

for more information you get the sample from here

for e.g

let edit = "Summary"
edit.count   // 7

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