blocks|key|4498202|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4498203|var+a+=+"Cash"
var+b+=+"cash"
let+result:+NSComparisonResult+=+a.compare(b,+options:+NSStringCompareOptions.CaseInsensitiveSearch,+range:+nil,+locale:+nil)

//+You+can+also+ignore+last+two+parameters(thanks+0x7fffffff)
//let+result:+NSComparisonResult+=+a.compare(b,+options:+NSStringCompareOptions.CaseInsensitiveSearch)|code-block|syntax|javascript|4498204|结果是NSComparisonResult枚举的类型：|4498205|enum+NSComparisonResult+:+Int+{

++++case+OrderedAscending
++++case+OrderedSame
++++case+OrderedDescending
}|4498206|所以你可以使用if语句：|4498207|if+result+==+.OrderedSame+{
++++println("equal")
}+else+{
++++println("not+equal")
}|4498208|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Try this:

<pre><code>var a = "Cash"
var b = "cash"
let result: NSComparisonResult = a.compare(b, options: NSStringCompareOptions.CaseInsensitiveSearch, range: nil, locale: nil)

// You can also ignore last two parameters(thanks 0x7fffffff)
//let result: NSComparisonResult = a.compare(b, options: NSStringCompareOptions.CaseInsensitiveSearch)
</code></pre>

result is type of NSComparisonResult enum:

<pre><code>enum NSComparisonResult : Int {

 case OrderedAscending
 case OrderedSame
 case OrderedDescending
}
</code></pre>

So you can use if statement:

<pre><code>if result == .OrderedSame {
 println("equal")
} else {
 println("not equal")
}
</code></pre>

blocks|key|4499190|text|可以只使用你自己的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4499191|func+equalIgnoringCase(a:String,+b:String)+->+Bool+{
++++return+a.lowercaseString+==+b.lowercaseString
}|code-block|syntax|javascript|4499192|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Could just roll your own:

<pre><code>func equalIgnoringCase(a:String, b:String) -&gt; Bool {
 return a.lowercaseString == b.lowercaseString
}
</code></pre>

blocks|key|4499198|text|if+a.lowercaseString+==+b.lowercaseString+{
++++//Strings+match
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4499199|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if a.lowercaseString == b.lowercaseString {
 //Strings match
}
</code></pre>

blocks|key|4498335|text|您还可以将所有字母设置为大写(或小写)，并查看它们是否相同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4498336|var+a+=+“Cash”
var+b+=+“CASh”

if+a.uppercaseString+==+b.uppercaseString{
++//DO+SOMETHING
}|code-block|syntax|javascript|4498337|这将使两个变量作为”CASH”，因此它们是相等的。|offset|length|style|CODE|4498338|您还可以创建一个String扩展|4498339|extension+String{
++func+equalsIgnoreCase(string:String)+->+Bool{
++++return+self.uppercaseString+==+string.uppercaseString
++}
}

if+"Something+ELSE".equalsIgnoreCase("something+Else"){
++print("TRUE")
}|4498340|entityMap^0|0|0|9|6|0|8|6|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

You could also make all the letters uppercase (or lowercase) and see if they are the same.

<pre><code>var a = “Cash”
var b = “CASh”

if a.uppercaseString == b.uppercaseString{
 //DO SOMETHING
}
</code></pre>

This will make both variables as <code>”CASH”</code> and thus they are equal.

You could also make a <code>String</code> extension

<pre><code>extension String{
 func equalsIgnoreCase(string:String) -&gt; Bool{
 return self.uppercaseString == string.uppercaseString
 }
}

if "Something ELSE".equalsIgnoreCase("something Else"){
 print("TRUE")
}
</code></pre>

blocks|key|4499296|text|使用caseInsensitiveCompare方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4499297|let+a+=+"Cash"
let+b+=+"cash"
let+c+=+a.caseInsensitiveCompare(b)+==+.orderedSame
print(c)+//+"true"|code-block|syntax|javascript|4499298|ComparisonResult会按照字典顺序告诉你哪个单词比另一个出现得更早(即哪个单词更接近字典的前面)。.orderedSame表示字符串将在字典中的相同位置结束|4499299|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/documentation/foundation/nsstring/1414769-caseinsensitivecompare^0|2|M|0|0|1J|C|0|G|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Use <code>caseInsensitiveCompare</code> method:

<pre><code>let a = "Cash"
let b = "cash"
let c = a.caseInsensitiveCompare(b) == .orderedSame
print(c) // "true"
</code></pre>

<a href="https://developer.apple.com/documentation/foundation/nsstring/1414769-caseinsensitivecompare" rel="noreferrer">ComparisonResult</a> tells you which word comes earlier than the other in lexicographic order (i.e. which one comes closer to the front of a dictionary). <code>.orderedSame</code> means the strings would end up in the same spot in the dictionary

blocks|key|4499335|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4499336|对于较老的swift：|4499337|var+a+:+String+=+"Cash"
var+b+:+String+=+"cash"

if(a.caseInsensitiveCompare(b)+==+NSComparisonResult.OrderedSame){
++++println("Et+voila")
}|code-block|syntax|javascript|4499338|4499339|Swift+3%2B|4499340|var+a+:+String+=+"Cash"
var+b+:+String+=+"cash"
++++
if(a.caseInsensitiveCompare(b)+==+.orderedSame){
++++print("Et+voila")
}|4499341|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|R|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|M|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|N|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|O|$]]

Try this :
For older swift:
<pre><code>var a : String = &quot;Cash&quot;
var b : String = &quot;cash&quot;

if(a.caseInsensitiveCompare(b) == NSComparisonResult.OrderedSame){
 println(&quot;Et voila&quot;)
}
</code></pre>
<hr />
Swift 3+
<pre><code>var a : String = &quot;Cash&quot;
var b : String = &quot;cash&quot;
 
if(a.caseInsensitiveCompare(b) == .orderedSame){
 print(&quot;Et voila&quot;)
}
</code></pre>

blocks|key|4499351|text|Swift+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4499352|if+a.lowercased()+==+b.lowercased()+{

}|code-block|syntax|javascript|4499353|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 3

<pre><code>if a.lowercased() == b.lowercased() {

}
</code></pre>

blocks|key|4498445|text|Swift+3：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4498446|您还可以在两个字符串之间使用本地化的不区分大小写的比较函数，该函数返回Bool|offset|length|style|CODE|4498447|var+a+=+"cash"
var+b+=+"Cash"

if+a.localizedCaseInsensitiveContains(b)+{
++++print("Identical")+++++++++++
}+else+{
++++print("Non+Identical")
}|code-block|syntax|javascript|4498448|entityMap^0|0|Z|4|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Swift 3:

You can also use the localized case insensitive comparison between two strings function and it returns <code>Bool</code>

<pre><code>var a = "cash"
var b = "Cash"

if a.localizedCaseInsensitiveContains(b) {
 print("Identical") 
} else {
 print("Non Identical")
}
</code></pre>

blocks|key|4498478|text|extension+String
{
++++func+equalIgnoreCase(_+compare:String)+->+Bool
++++{
++++++++return+self.uppercased()+==+compare.uppercased()
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4498479|使用示例|unstyled|4498480|print("lala".equalIgnoreCase("LALA"))
print("l4la".equalIgnoreCase("LALA"))
print("laLa".equalIgnoreCase("LALA"))
print("LALa".equalIgnoreCase("LALA"))|4498481|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>extension String
{
 func equalIgnoreCase(_ compare:String) -&gt; Bool
 {
 return self.uppercased() == compare.uppercased()
 }
}
</code></pre>

sample of use

<pre><code>print("lala".equalIgnoreCase("LALA"))
print("l4la".equalIgnoreCase("LALA"))
print("laLa".equalIgnoreCase("LALA"))
print("LALa".equalIgnoreCase("LALA"))
</code></pre>

blocks|key|4498499|text|在Swift+4中，我使用caseInsensitiveCompare()作为模板进行字符串扩展(但允许操作数是可选的)。这是我用来把它组合在一起的游乐场(+Swift的新手，所以欢迎反馈)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4498500|import+UIKit

extension+String+{
++++func+caseInsensitiveEquals<T>(_+otherString:+T?)+->+Bool+where+T+:+StringProtocol+{
++++++++guard+let+otherString+=+otherString+else+{
++++++++++++return+false
++++++++}
++++++++return+self.caseInsensitiveCompare(otherString)+==+ComparisonResult.orderedSame
++++}
}

"string+1".caseInsensitiveEquals("string+2")+//+false

"thingy".caseInsensitiveEquals("thingy")+//+true

let+nilString1:+String?+=+nil
"woohoo".caseInsensitiveEquals(nilString1)+//+false|code-block|syntax|javascript|4498501|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Swift 4, I went the String extension route using caseInsensitiveCompare() as a template (but allowing the operand to be an optional). Here's the playground I used to put it together (new to Swift so feedback more than welcome).

<pre><code>import UIKit

extension String {
 func caseInsensitiveEquals&lt;T&gt;(_ otherString: T?) -&gt; Bool where T : StringProtocol {
 guard let otherString = otherString else {
 return false
 }
 return self.caseInsensitiveCompare(otherString) == ComparisonResult.orderedSame
 }
}

"string 1".caseInsensitiveEquals("string 2") // false

"thingy".caseInsensitiveEquals("thingy") // true

let nilString1: String? = nil
"woohoo".caseInsensitiveEquals(nilString1) // false
</code></pre>

blocks|key|4499454|text|电话号码比较示例；使用swift+4.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4499455|var+selectPhone+=+[String]()

if+selectPhone.index(where:+{$0.caseInsensitiveCompare(contactsList[indexPath.row].phone!)+==+.orderedSame})+!=+nil+{
++++print("Same+value")
}+else+{
++++print("Not+the+same")
}|code-block|syntax|javascript|4499456|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Phone numbers comparison example; using swift 4.2 

<pre><code>var selectPhone = [String]()

if selectPhone.index(where: {$0.caseInsensitiveCompare(contactsList[indexPath.row].phone!) == .orderedSame}) != nil {
 print("Same value")
} else {
 print("Not the same")
}
</code></pre>

blocks|key|4499499|text|只需几行代码就可以编写用于比较的字符串扩展|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4499500|extension+String+{

++++func+compare(_+with+:+String)->Bool{
++++++++return+self.caseInsensitiveCompare(with)+==+.orderedSame
++++}+
}|code-block|syntax|javascript|4499501|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can just write your String Extension for comparison in just a few line of code

<pre><code>extension String {

 func compare(_ with : String)-&gt;Bool{
 return self.caseInsensitiveCompare(with) == .orderedSame
 } 
}
</code></pre>

blocks|key|4498586|text|对于Swift+5，忽略大小写并比较两个字符串|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4498587|var+a+=+"cash"
var+b+=+"Cash"
if(a.caseInsensitiveCompare(b)+==+.orderedSame){
+++++print("Ok")
}|code-block|syntax|javascript|4498588|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Swift 5 
Ignoring the case and compare two string 

<pre><code>var a = "cash"
var b = "Cash"
if(a.caseInsensitiveCompare(b) == .orderedSame){
 print("Ok")
}
</code></pre>

How can we compare two strings in swift ignoring case ?
for eg :

<pre><code>var a = "Cash"
var b = "cash"
</code></pre>

Is there any method that will return true if we compare var a &amp; var b

How to compare two strings ignoring case in Swift language?

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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我们如何在快速忽略的情况下比较两个字符串？例如：var a = "Cash"var b = "cash"如果我们比较var a和var b，是否有任何方法返回true

问如何在Swift语言中比较两个忽略大小写的字符串？
EN

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问如何在Swift语言中比较两个忽略大小写的字符串？EN