blocks|key|428539|text|count(mystr)是正确的方式，您不需要转换编码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|428540|这是:只要你做了if+count(mystr.utf16)+>=+3，Int16(3)就可以了|428541|编辑:这是一个旧的答案。OP更新了他的问题以反映Swift+2，上面的答案是正确的。|428542|entityMap^0|0|C|0|8|Q|Z|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

<code>count(mystr)</code> is the correct way, you do not need to convert the encoding.

This: <code>if count(mystr.utf16) &gt;= 3</code> is fine as long as you do <code>Int16(3)</code>

Edit: this is an old answer. OP updated his question to reflect Swift 2 and the above answer is correct.

blocks|key|3437188|text|您可以使用扩展名如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3437189|extension+String+{
+++++var+length:+Int+{+return+count(self)+++++++++}++//+Swift+1.2
}|code-block|syntax|javascript|3437190|你可以用它：|3437191|if+mystr.length+>=+3+{

}|3437192|或者你可以用这种方式直接数数：|3437193|if+count(mystr)+>=+3{

}|3437194|这也适用于我：|3437195|if+count(mystr.utf16)+>=+3+{

}|3437196|SWIFT2.0：|offset|length|style|BOLD|3437197|extension+String+{
++++var+length:+Int+{
++++++++return+characters.count
++++}
}
let+str+=+"Hello,+World"
str.length++//12|3437198|另一个分机：|3437199|extension+String+{
++++var+length:+Int+{
++++++++return+(self+as+NSString).length
++++}
}
let+str+=+"Hello,+World"
str.length+//12|3437200|如果你想直接使用：|3437201|let+str:+String+=+"Hello,+World"
print(str.characters.count)+//+12

let+str1:+String+=+"Hello,+World"
print(str1.endIndex)+//+12

let+str2+=+"Hello,+World"
NSString(string:+str2).length++//12|3437202|entityMap^0|0|0|0|0|0|0|0|0|0|9|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1C|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1H|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1I|8|@$U|1J|V|1K|W|X]]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1L|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1M|8|@]|9|@]|A|$]]|$1|12|3|13|5|D|7|1N|8|@]|9|@]|A|$E|F]]|$1|14|3|15|5|6|7|1O|8|@]|9|@]|A|$]]|$1|16|3|17|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|18|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|19|$]]

You can use extension for it like:

<pre><code>extension String {
 var length: Int { return count(self) } // Swift 1.2
}
</code></pre>

and you can use it:

<pre><code>if mystr.length &gt;= 3 {

}
</code></pre>

Or you can directly count this way:

<pre><code>if count(mystr) &gt;= 3{

}
</code></pre>

And this is also working for me :

<pre><code>if count(mystr.utf16) &gt;= 3 {

}
</code></pre>

For Swift 2.0:

<pre><code>extension String {
 var length: Int {
 return characters.count
 }
}
let str = "Hello, World"
str.length //12
</code></pre>

Another extension:

<pre><code>extension String {
 var length: Int {
 return (self as NSString).length
 }
}
let str = "Hello, World"
str.length //12
</code></pre>

If you want direct use:

<pre><code>let str: String = "Hello, World"
print(str.characters.count) // 12

let str1: String = "Hello, World"
print(str1.endIndex) // 12

let str2 = "Hello, World"
NSString(string: str2).length //12
</code></pre>

blocks|key|3931954|text|必须使用包含属性计数的字符属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3931955|yourString.characters.count|blockquote|3931956|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|H|8|@]|9|@]|A|$]]|$1|E|3|-4|5|6|7|I|8|@]|9|@]|A|$]]]|F|$]]

You have to use characters property that contains the property count :

<blockquote>
 yourString.characters.count
</blockquote>

blocks|key|429164|text|SWIFT2.0更新|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|429165|extension+String+{
++++var+count:+Int+{+return+self.characters.count+}
}|code-block|syntax|javascript|429166|使用：|429167|var+str+=+"I+love+Swift+2.0!"
var+n+=+str.count|429168|https://gist.github.com/chess92|429169|entityMap|0|LINK|mutability|MUTABLE|url^0|0|A|0|0|0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|Q|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|P]]]]

Swift 2.0 UPDATE

<pre><code>extension String {
 var count: Int { return self.characters.count }
}
</code></pre>

Use:

<pre><code>var str = "I love Swift 2.0!"
var n = str.count
</code></pre>

<a href="https://gist.github.com/chess92" rel="nofollow">Helpful Progamming Tips and Hacks</a>

blocks|key|429182|text|以下是从here复制的全部内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|429183|let+str+=+"Hello"
let+count+=+str.length++++//+returns+5+(Int)

extension+String+{
++++var+length:+Int+{+return+countElements(self)+}++//+Swift+1.1
}
extension+String+{
++++var+length:+Int+{+return+count(self)+++++++++}++//+Swift+1.2
}
extension+String+{
++++var+length:+Int+{+return+characters.count++++}++//+Swift+2.0
}|code-block|syntax|javascript|429184|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/26516178/596360^0|4|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Here is all in one -- copied from <a href="https://stackoverflow.com/a/26516178/596360">here</a>

<pre><code>let str = "Hello"
let count = str.length // returns 5 (Int)

extension String {
 var length: Int { return countElements(self) } // Swift 1.1
}
extension String {
 var length: Int { return count(self) } // Swift 1.2
}
extension String {
 var length: Int { return characters.count } // Swift 2.0
}
</code></pre>

In the previous version of Swift, I had the following code.

<pre><code>func myfunc(mystr: String) {
 if mystr.utf16Count &gt;= 3 {
</code></pre>

With the latest release of Swift 1.2, I now get the following error.

<pre><code>'utf16Count' is unavailable: Take the count of a UTF-16 view instead, i.e. count(str.utf16)
</code></pre>

So I change my code as follows:

<pre><code>func myfunc(mystr: String) {
 if count(mystr.utf16) &gt;= 3 {
</code></pre>

But that doesn't work. I now get the following error message instead.

<pre><code>'(String.UTF16View) -&gt; _' is not identical to 'Int16'
</code></pre>

What is the correct way to get the length of a string with Swift 1.2?

String length in Swift 1.2 and Swift 2.0

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Swift的前一个版本中，我有以下代码。func myfunc(mystr: String) {    if mystr.utf16Count >= 3 {使用SWIFT1.2的最新版本，我现在得到了以下错误。'utf16Count' is unavailable: Take the count of a UTF-1...

问SWIFT1.2和SWIFT2.0中的字符串长度
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问SWIFT1.2和SWIFT2.0中的字符串长度EN